CAN COMMUNICATION SYSTEM DIAGNOSIS SYSTEM

CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION

The systems (ECUs and sensors) that use CAN communication vary depending on the vehicle and optional equipment. Check which systems (ECUs and sensors) are installed to the vehicle.

Connected to	Code	ECU/Sensor Name	GTS Display	Applicability
-	CGW	Central Gateway ECU (Network Gateway ECU)	CAN Gateway1 CAN Gateway2	Installed on all vehicles
V Bus	DLC3	DLC3	-	Installed on all vehicles
Bus 2	MET	Combination Meter Assembly	Combination Meter	Installed on all vehicles
	BRK	Skid Control ECU (Brake Actuator Assembly)	Skid Control (ABS/VSC/TRAC)	Installed on all vehicles
	SRS	Airbag Sensor Assembly	Airbag	Installed on all vehicles
	CS	Clearance Warning ECU Assembly	Clearance Warning (Clearance Sonar)	Vehicles with Toyota Parking Assist-sensor System
	SMT	Certification ECU (Smart Key ECU Assembly)	Certification (Smart)	Vehicles with Smart Entry and Start System
	A/C	Air Conditioning Amplifier Assembly	Air Conditioning Amplifier	Installed on all vehicles
	LIT	Headlight Leveling ECU Assembly	Headlight swivel (AFS)	Vehicles with Automatic Headlight Beam Level Control System
	STR	Steering Sensor	Spiral cable (Steering Angle Sensor)	Installed on all vehicles
	ENG	ECM	ECM (Engine)	Installed on all vehicles
	AWD	4WD ECU Assembly	Four Wheel Drive Control	Vehicles with AWD
	EPS	Power Steering ECU Assembly	Power Steering (EPS)	Installed on all vehicles
	MB	Main Body ECU (Multiplex Network Body ECU)	Main Body	Installed on all vehicles
Bus 3	AV	Navigation Receiver Assembly	Display and Navigation (AVN)	Vehicles with Navigation Receiver Type
	AV	Radio and Display Receiver Assembly	Display and Navigation (AVN)	Vehicles with Radio and Display Type
	DCM	Telematics Transceiver	DCM	Vehicles with Telematics Transceiver
Bus 5	F-CAM	Forward Recognition Camera	Front Camera Module	Vehicles with Toyota Safety Sense
	F-MR	Millimeter Wave Radar Sensor Assembly	Front Radar	Vehicles with Toyota Safety Sense
	DS	Driving Support ECU Assembly	Driving Support (Cruise Control-ACC)	Vehicles with Toyota Safety Sense
	PAC	Parking Assist ECU	Panoramic View Monitor	Vehicles with Panoramic View Monitor System
	BSM	Blind Spot Monitor Sensor LH	Blind Spot Monitor Master	Vehicles with Blind Spot Monitor System
	R-CA	Television Camera Assembly	Parking Assist Monitor System	Vehicles with Parking Assist Monitor System
Sub Bus 1	MB	Main Body ECU (Multiplex Network Body ECU)	-	Installed on all vehicles
	MIR-R	Outer Mirror Control ECU Assembly (for Front Passenger Side)	Front Door RH/R-Mirror (FR-Door2/R-Mirror) (for LHD) Front Door LH/L-Mirror (FL-Door2/L-Mirror) (for RHD)	Vehicles with Seat Position Memory System
	DST	Position Control ECU and Switch Assembly	D-Seat	Vehicles with Seat Position Memory System
	MIR-L	Outer Mirror Control ECU Assembly (for Driver Side)	Front Door LH/L-Mirror (FL-Door2/L-Mirror) (for LHD) Front Door RH/R-Mirror (FR-Door2/R-Mirror) (for RHD)	Vehicles with Seat Position Memory System
	BKD	Multiplex Network Door ECU	Back Door	Vehicles with Power Back Door System

Tech Tips

The names of ECUs and sensors shown on the GTS display may differ from those shown in the DTC Table by ECU section that follows.

CAN BUS CHECK

Tech Tips

The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the GTS.

Using the GTS, select the CAN Bus Check screen.

CAN Bus Check

Note

It may be possible to select buses that do not have ECUs or sensors from the bus selection pull-down menu. This is not a malfunction. (This occurs when optional devices are not on a sub bus that is monitored by a gateway function equipped ECU.)
In the bus selection pull down menu, all buses applicable to the model are displayed (e.g. LIN communication buses are also displayed). Therefore, refer to the wiring diagrams to check the names of sub buses for CAN communication.

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Tech Tips

Different connection statuses are indicated by the background color of ECUs and sensors that are displayed.

Explanation of CAN Bus Check Screen
Bus Type	Background Color	Connection Status
Bus	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS.4 No ECUs or sensors are connected to the bus.5
Sub bus with a gateway function equipped ECU that does not memorize connected ECUs or sensors*2	White	Communication has been normal since the start of the CAN bus check.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Communication stop has continued since the start of the CAN bus check.*1
Sub bus with a gateway function equipped ECU that memorizes connected ECUs and sensors*3	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU).6 No ECUs or sensors are connected to the sub bus.7

Gateway function equipped ECUs relay signals between ECUs and sensors connected to different buses.
*1: An ECU or sensor is installed to the vehicle but is not displayed on the "Communication Bus Check" screen.
*2: The gateway function equipped ECU does not memorize ECUs and sensors connected to its respective sub bus.
*3: The gateway function equipped ECU memorizes ECUs and sensors connected to its respective sub bus.
*4: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS, the name of buses, sub buses, ECUs and sensors will not be displayed.
*5: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.
*6: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.
*7: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.
If there is no communication between the GTS and the vehicle, or no ECUs or sensors are displayed as connected, check the central gateway ECU (network gateway ECU) and V bus (the bus that connects the DLC3 to the central gateway ECU (network gateway ECU)) for malfunctions.

Observe the connection response screen for approximately 2 minutes to check for a change in connection status of the connected ECUs and sensors.
Tech Tips
- If an open occurs in one of the lines of a CAN branch (except DLC3), output from the other branch line (the line that is not open) will be unstable and it may interfere with the response (display) of other ECUs and sensors.
- If the connection status changes during the inspection, repair the open in the branch line of the ECU or sensor that does not respond (is not detected) and then perform the CAN bus check again.

HOW TO INTERPRET CAN BUS CHECK SCREEN

When a communication stop is currently occurring, the probable malfunctioning part can be determined from the CAN bus check and by using the following methods.

Note

The following CAN bus wiring diagram is provided only as an example. This wiring diagram is different from the actual wiring diagram for this vehicle.
Tech Tips
- When a communication stop is currently occurring, it is easier to determine the probable malfunctioning part from the CAN bus check rather than from communication DTCs.
- Wait for approximately 2 minutes after turning the ignition switch to ON (or simulate the driving conditions that enable the malfunction to be reproduced) and select "CAN Bus Check". Then observe the communication status of each ECU on the screen.

If a communication error of only 1 ECU or sensor is indicated on the CAN Bus Check screen, a communication stop of the ECU or sensor is suspected.

Open in both CAN branch lines of HV on the bus 4

*a	Bus 2	*b	Bus 4
*c	Sub Bus	*d	V Bus
*e	Location of Malfunction	*f	Background color is red

Tech Tips

When there are communication stops, ECUs that are present in the vehicle may not be displayed on the CAN Bus Check screen.

If communication errors for multiple ECUs or sensors are indicated on the CAN Bus Check screen, then a communication stop of the ECU or sensor that shows a more serious communication stop (an ECU or sensor whose background color is red) is suspected.

Example: Open in a CAN branch line for HV on the bus 4

*a	Background color is red	*b	Background color intermittently becomes yellow or red
*c	Not displayed or background color is yellow or red	-	-

Explanation of CAN Bus Check Screen
Bus Type	Background Color	Connection Status
Bus	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS.4 No ECUs or sensors are connected to the bus.5
Sub bus with a gateway function equipped ECU that does not memorize connected ECUs or sensors*2	White	Communication has been normal since the start of the CAN bus check.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Communication stop has continued since the start of the CAN bus check.*1
Sub bus with a gateway function equipped ECU that memorizes connected ECUs and sensors*3	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU).6 No ECUs or sensors are connected to the sub bus.7

Gateway function equipped ECUs relay signals between ECUs and sensors connected to different buses.
*1: An ECU or sensor is installed to the vehicle but is not displayed on the "Communication Bus Check" screen.
*2: The gateway function equipped ECU does not memorize ECUs and sensors connected to its respective sub bus.
*3: The gateway function equipped ECU memorizes ECUs and sensors connected to its respective sub bus.
*4: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS, the name of buses, sub buses, ECUs and sensors will not be displayed.
*5: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.
*6: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.
*7: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.
The example of the CAN Bus Check screen in the illustration shows the result of electrical noise on the CAN bus which is caused by an open in a CAN branch line of HV is also unstable. In addition, in this example, MB is equipped with a gateway function. Therefore, communication is also unstable between the Sub bus ECUs of MB and the bus 4.
The example in the illustration shows that HV has a red background color on the CAN Bus Check screen. This indicates a more significant communication stop. In this case, a communication stop of HV is suspected.

If a communication error is indicated on both the bus 4 and Sub bus on the CAN Bus Check screen, suspect any communication stop displayed for the bus 4 first.

Example: Open in both CAN branch lines of MB on the bus 4

*a Background color is red *b Not displayed
Tech Tips
- In the CAN bus check, it is possible to confirm the communication status of ECUs connected to the bus after connecting the GTS to the DLC3. As for sub bus, it is possible to confirm which sub bus connected ECUs can communicate with a gateway function equipped ECU on the bus.
- If a gateway function equipped ECU has a communication error, ECUs connected to the gateway function equipped ECU are also affected, and communication stops will be indicated.
- The CAN Bus Check screen in the illustration shows that MB has a gateway function and a communication stop in MB is suspected.
If the CAN Bus Check screen indicates a communication stop only in the sub bus, a communication stop in the sub bus is suspected.

Example: Open in both CAN branch lines of MIR-R on the sub bus

*a Background color is red - -
Tech Tips
- A communication error in a sub bus does not affect the other buses.
- When a gateway function equipped ECU has memorized the ECUs that are connected to the sub bus, if any of the ECUs connected to the gateway function equipped ECU has a communication error, the background color changes to yellow or red. (The displayed name will not disappear.)

If both of the bus 2 main bus lines are open, ECUs or sensors that are located farther away from the central gateway ECU (network gateway ECU) than the open part will be displayed as a communication stop on the CAN Bus Check screen.

(In this case, HVB, R-MGC and ENG background color changes to red.)

*a	Bus 2	*b	Bus 4
*c	Sub Bus	*d	V Bus
*e	Location of Malfunction	*f	Background color is red

Tech Tips

If a communication error occurs in an ECU, it is not displayed on the CAN Bus Check screen even though the ECU is present.

If both of the sub bus main bus lines are open, ECUs that are located farther away from the gateway function equipped ECU than the open part will be displayed as a communication stop on the CAN Bus Check screen.

(In this case, MIR-L background color changes to red.)

*a	Bus 2	*b	Bus 4
*c	Sub Bus	*d	V Bus
*e	Location of Malfunction	*f	Background color is red

When any of the following malfunctions occur, CAN communication cannot be established and almost all ECUs and sensors on the bus show a communication error on the CAN Bus Check screen.

Details of Malfunction
Short between CAN lines (CANH and CANL)
Short between a CAN line (CANH or CANL) and +B
Short between a CAN line (CANH or CANL) and ground
Open in a CAN main bus line

*a	When any of the following malfunctions occur on the bus 4	*b	When any of the following malfunctions occur on a sub bus
*c	Background color is red	*d	Not displayed

Tech Tips

When a malfunction occurs in the bus, almost all ECUs and sensors on the bus and sub bus indicate a communication error (almost all ECUs are not displayed). As communication with the gateway function equipped ECU that is connected to the bus stops, communication from the ECUs connected to the sub bus that is monitored by the gateway function equipped ECU also stops (these ECUs are not displayed).
When a malfunction occurs in a sub bus, almost all ECUs connected to the sub bus indicate a communication error.
A communication error in a sub bus does not affect the other buses.
The malfunctioning part can be determined by checking for a short circuit between CAN bus lines or between a CAN bus line and ground or +B short using an electrical tester.

If a communication error of all ECUs and sensors is indicated on the CAN Bus Check screen, a communication stop of the V bus (DLC3 - central gateway ECU (network gateway ECU)) is suspected.

Open in both CAN branch lines in the V bus

*a	Bus 2	*b	Bus 4
*c	Sub Bus	*d	V Bus
*e	Location of Malfunction	*f	Not displayed

Tech Tips

When there is no communication between the GTS and the vehicle, no ECUs or sensors will be displayed.

DTC TABLE BY ECU

Tech Tips

In the CAN communication system, the CAN communication DTCs of each ECU can be displayed using the GTS.
If CAN communication system DTCs are output, the malfunction cannot be determined only by the DTCs. Perform troubleshooting according to How to Proceed with Troubleshooting.

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If the system function temporarily returns to normal, DTCs may not be output again even though the following DTC check procedures are used.

ECM (for 1AR-FE) / GTS Display "Engine and ECT"

Powertrain > Engine and ECT > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Refer to Automatic Transaxle System.

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*2: Refer to SFI System.

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ECM (for 1AR-FE) / GTS Display "Engine and ECT"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100*1	Lost Communication with ECM/PCM "A"	The TCM does not receive data from the ECM for 1.25 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the ECM is 10.5 V or more.	Turn the ignition switch to ON and wait at least 1.25 seconds.	MIL illuminates.	DTC is stored until it is cleared using the GTS.
U0101*2	Lost Communication with TCM	The ECM does not receive data from the TCM for 1.25 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the ECM is 10.5 V or more.	Turn the ignition switch to ON and wait at least 1.25 seconds.	MIL illuminates.	DTC is stored until it is cleared using the GTS.

ECM (for 2GR-FKS) / GTS Display "Engine"

Powertrain > Engine > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*: Refer to SFI System.

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ECM (for 2GR-FKS) / GTS Display "Engine"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U010187*	Lost Communication with TCM Missing Message	The ECM does not receive data from the TCM for 1.25 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the ECM is 10 V or more.	Turn the ignition switch to ON and wait at least 3.5 seconds.	MIL illuminates.	DTC is stored until it is cleared using the GTS.

TCM (for 2GR-FKS) / GTS Display "Transmission"

Powertrain > Transmission > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*: Refer to Automatic Transaxle System.

for UA80E

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for UA80F

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TCM (for 2GR-FKS) / GTS Display "Transmission"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U010087*	Lost Communication with ECM/PCM "A" Missing Message	The TCM does not receive data from the ECM for 1.25 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the ECM is 9.5 V or more.	Turn the ignition switch to ON and wait at least 2.5 seconds.	MIL illuminates.	DTC is stored until it is cleared using the GTS.

Skid Control ECU (Brake Actuator Assembly) / GTS Display "ABS/VSC/TRC"

Chassis > ABS/VSC/TRC > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Skid Control ECU (Brake Actuator Assembly) / GTS Display "ABS/VSC/TRC"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0073	Control Module Communication Bus Off	One of the following conditions is met: Delayed reception of data from the steering sensor and airbag sensor assembly continues for 1 second or more. The following condition occurs 10 times or more within 60 seconds: Delayed reception of data from the steering sensor and airbag sensor assembly occurs once or more within 5 seconds. The following condition occurs 10 times in succession: The skid control ECU (brake actuator assembly) cannot send/receive data (bus off) once or more within 0.1 seconds.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the skid control ECU (brake actuator assembly) (+BS terminal voltage) is between 10 and 17.4 V.	Turn the ignition switch to ON and wait at least 60 seconds.	ABS warning light illuminates. Slip indicator light illuminates. Brake warning light illuminates.	DTC is stored until it is cleared using the GTS.
U0100	Lost Communication With ECM/PCM	The skid control ECU (brake actuator assembly) does not receive data from the ECM for 2 seconds or more.	All conditions are met: The ignition switch is ON for 1 second or more. Vehicle speed is 15 km/h (9 mph) or more. The power source voltage of the skid control ECU (brake actuator assembly) (+BS terminal voltage) is between 10 and 17.4 V.	Turn the ignition switch to ON and drive the vehicle at a speed of 15 km/h (9 mph) or more for 3 seconds or more.	Slip indicator light illuminates.	DTC is stored until it is cleared using the GTS.
U0124	Lost Communication With Lateral Acceleration Sensor Module	Either of the following conditions is met: The skid control ECU (brake actuator assembly) does not receive data from the airbag sensor assembly for 1 second or more. The following condition occurs 10 times or more within 60 seconds: The skid control ECU (brake actuator assembly) does not receive data from the airbag sensor assembly once or more within 5 seconds.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the skid control ECU (brake actuator assembly) (+BS terminal voltage) is between 10 and 17.4 V.	Turn the ignition switch to ON and wait at least 60 seconds.	ABS warning light illuminates. Slip indicator light illuminates.	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication With Steering Angle Sensor Module	Either of the following conditions is met: The skid control ECU (brake actuator assembly) does not receive data from the steering sensor for 1 second or more. The following condition occurs 10 times or more within 60 seconds: The skid control ECU (brake actuator assembly) does not receive data from the steering sensor once or more within 5 seconds.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the skid control ECU (brake actuator assembly) (+BS terminal voltage) is between 10 and 17.4 V.	Turn the ignition switch to ON and wait at least 60 seconds.	Slip indicator light illuminates.	DTC is stored until it is cleared using the GTS.

Power Steering ECU Assembly / GTS Display "EMPS"

Chassis > EMPS > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Power Steering ECU Assembly / GTS Display "EMPS"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The power steering ECU assembly does not receive data from the ECM for 5 seconds or more.	All conditions are met: The ignition switch is ON for 1 second or more. Vehicle speed is 20 km/h (12 mph) or more. The power source voltage of the power steering ECU assembly is 9 V or more.	Drive the vehicle at a speed of 20 km/h (12 mph) or more for 6 seconds or more.	EPS warning light illuminates.	DTC remains stored only while malfunction is occurring.
U0129	Lost Communication with Brake System Control Module	The power steering ECU assembly cannot receive data from the skid control ECU (brake actuator assembly) for 2.34 seconds or more.	Both conditions are met: The ignition switch is ON for 2 seconds or more. The power source voltage of the power steering ECU assembly is 9 V or more.	Turn the ignition switch to ON and wait at least 4.34 seconds.	EPS warning light illuminates.	DTC remains stored only while malfunction is occurring.

Main Body ECU (Multiplex Network Body ECU) / GTS Display "Main Body"

Body Electrical > Main Body > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: for LHD
*2: for RHD

Main Body ECU (Multiplex Network Body ECU) / GTS Display "Main Body"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication With ECM/PCM "A"	The main body ECU (multiplex network body ECU) does not receive data from the ECM for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0101	Lost Communication with TCM	The main body ECU (multiplex network body ECU) does not receive data from the TCM for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0120	Lost Communication With Starter / Generator Control Module	The main body ECU (multiplex network body ECU) does not receive data from the certification ECU (smart key ECU assembly) for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The main body ECU (multiplex network body ECU) does not receive data from the skid control ECU (brake actuator assembly) for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0151	Lost Communication with Restraints Control Module	The main body ECU (multiplex network body ECU) does not receive data from the airbag sensor assembly for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	The main body ECU (multiplex network body ECU) does not receive data from the combination meter assembly for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0164	Lost Communication with HVAC Control Module	The main body ECU (multiplex network body ECU) does not receive data from the air conditioning amplifier assembly for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0199	Lost Communication with ''Door Control Module A''	The main body ECU (multiplex network body ECU) does not receive data from the outer mirror control ECU assembly (for front passenger side) for 10 seconds or more. 1 The main body ECU (multiplex network body ECU) does not receive data from the outer mirror control ECU assembly (for driver side) for 10 seconds or more.2	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0200	Lost Communication with ''Door Control Module B''	The main body ECU (multiplex network body ECU) does not receive data from the outer mirror control ECU assembly (for driver side) for 10 seconds or more.1 The main body ECU (multiplex network body ECU) does not receive data from the outer mirror control ECU assembly (for front passenger side) for 10 seconds or more. 2	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0208	Lost Communication with ''Seat Control Module A''	The main body ECU (multiplex network body ECU) does not receive data from the position control ECU and switch assembly for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0230	Lost Communication with Rear Gate Module	The main body ECU (multiplex network body ECU) does not receive data from the multiplex network door ECU for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U023A	Lost Communication With Image Processing Module "A"	The main body ECU (multiplex network body ECU) does not receive data from the forward recognition camera for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0327	Software Incompatibility with Vehicle Security Control Module	The main body ECU (multiplex network body ECU) does not receive data from the certification ECU (smart key ECU assembly) for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U1002	Lost Communication with Gateway Module	The main body ECU (multiplex network body ECU) detects communication errors between itself and the position control ECU and switch assembly, outer mirror control ECU assembly (for front passenger side), outer mirror control ECU assembly (for driver side) and multiplex network door ECU.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U1126	Lost Communication with Parking Assist Monitor Module	The main body ECU (multiplex network body ECU) does not receive data from the television camera assembly for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the main body ECU (multiplex network body ECU) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.

Certification ECU (Smart Key ECU Assembly) / GTS Display "Entry&Start"

Body Electrical > Entry&Start > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Certification ECU (Smart Key ECU Assembly) / GTS Display "Entry&Start"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication With ECM/PCM	The certification ECU (smart key ECU assembly) does not receive data from the ECM for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The certification ECU (smart key ECU assembly) does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	The certification ECU (smart key ECU assembly) does not receive data from the combination meter assembly for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	DTC is stored until it is cleared using the GTS.

Certification ECU (Smart Key ECU Assembly) / GTS Display "Power Source Control"

Body Electrical > Power Source Control > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Certification ECU (Smart Key ECU Assembly) / GTS Display "Power Source Control"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	ECM Communication	The certification ECU (smart key ECU assembly) does not receive data from the ECM for 3.1 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the certification ECU (smart key ECU assembly) is 9.5 V or more.	Turn the ignition switch to ON and wait at least 4.1 seconds.	-	DTC is stored until it is cleared using the GTS.
U0140	Lost Communication with Body Control Module	The certification ECU (smart key ECU assembly) does not receive data from the main body ECU (multiplex network body ECU) for 3 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the certification ECU (smart key ECU assembly) is 9.5 V or more.	Turn the ignition switch to ON and wait at least 3 seconds.	-	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	The certification ECU (smart key ECU assembly) does not receive data from the combination meter assembly for 3.1 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the certification ECU (smart key ECU assembly) is 9.5 V or more.	Turn the ignition switch to ON and wait at least 3.1 seconds.	-	DTC is stored until it is cleared using the GTS.

Certification ECU (Smart Key ECU Assembly) / GTS Display "Starting Control"

Body Electrical > Starting Control > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Certification ECU (Smart Key ECU Assembly) / GTS Display "Starting Control"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The certification ECU (smart key ECU assembly) does not receive data from the ECM for 2 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the certification ECU (smart key ECU assembly) is 10.5 V or more.	Turn the ignition switch to ON and wait at least 2 seconds.	-	DTC remains stored only while malfunction is occurring.

Headlight Leveling ECU Assembly / GTS Display "HL AutoLeveling"

Body Electrical > HL AutoLeveling > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*: The headlight leveling ECU assembly stores this DTC if an internal error related to the CAN communication system is detected.

Click here

Headlight Leveling ECU Assembly / GTS Display "HL AutoLeveling"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The headlight leveling ECU assembly does not receive data from the ECM for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the headlight leveling ECU assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 13 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The headlight leveling ECU assembly does not receive data from the skid control ECU (brake actuator assembly) for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the headlight leveling ECU assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 13 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The headlight leveling ECU assembly does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the headlight leveling ECU assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 13 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U1000*	CAN Communication Failure(Message Registry)	When the ignition switch is turned ON, a CAN communication malfunction is detected.	The ignition switch is ON.	Turn the ignition switch to ON.	Displays messages on the multi-information display.	DTC remains stored only while malfunction is occurring.

Television Camera Assembly / GTS Display "IPA/Parking Assist Monitor"

Chassis > IPA/Parking Assist Monitor > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*: The television camera assembly stores this DTC if an internal error related to the CAN communication system is detected.

Click here

Television Camera Assembly / GTS Display "IPA/Parking Assist Monitor"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The television camera assembly does not receive data from the ECM for 11 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the television camera assembly is 5.5 V or more.	Turn the ignition switch to ON and wait at least 14 seconds.	-	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The television camera assembly does not receive data from the steering sensor for 11 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the television camera assembly is 5.5 V or more.	Turn the ignition switch to ON and wait at least 14 seconds.	-	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The television camera assembly does not receive data from the skid control ECU (brake actuator assembly) for 11 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the television camera assembly is 5.5 V or more.	Turn the ignition switch to ON and wait at least 14 seconds.	-	DTC is stored until it is cleared using the GTS.
U0131	Lost Communication with Power Steering Control Module	The television camera assembly does not receive data from the power steering ECU assembly for 11 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the television camera assembly is 5.5 V or more.	Turn the ignition switch to ON and wait at least 14 seconds.	-	DTC is stored until it is cleared using the GTS.
U0140	Lost Communication with Body Control Module	The television camera assembly does not receive data from the main body ECU (multiplex network body ECU) for 11 seconds or more.	Both conditions are met: The ignition switch is ACC for 3 seconds or more. The power source voltage of the television camera assembly is 5.5 V or more.	Turn the ignition switch to ON and wait at least 14 seconds.	-	DTC is stored until it is cleared using the GTS.
U0163	Lost Communication with Navigation Control Module	The television camera assembly does not receive data from the radio and display receiver assembly for 11 seconds or more.	Both conditions are met: The ignition switch is ACC for 3 seconds or more. The power source voltage of the television camera assembly is 5.5 V or more.	Turn the ignition switch to ON and wait at least 14 seconds.	-	DTC is stored until it is cleared using the GTS.
U0233	Lost Communication with Blind Spot Monitor Master Module	The television camera assembly does not receive data from the blind spot monitor sensor LH for 11 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the television camera assembly is 5.5 V or more.	Turn the ignition switch to ON and wait at least 14 seconds.	-	DTC is stored until it is cleared using the GTS.
U1000*	CAN Communication Failure(Message Registry)	When the ignition switch is turned ON, a CAN communication malfunction is detected.	The ignition switch is ON.	Turn the ignition switch to ON.	-	DTC remains stored only while malfunction is occurring.
U1110	Lost Communication with Clearance Sonar Module	The television camera assembly does not receive data from the clearance warning ECU assembly for 11 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the television camera assembly is 5.5 V or more.	Turn the ignition switch to ON and wait at least 14 seconds.	-	DTC is stored until it is cleared using the GTS.

Air Conditioning Amplifier Assembly / GTS Display "Air Conditioner"

Body Electrical > Air Conditioner > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Air Conditioning Amplifier Assembly / GTS Display "Air Conditioner"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication With ECM/PCM "A"	The air conditioning amplifier assembly does not receive data from the ECM for 5 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the air conditioning amplifier assembly is 10 V or more.	Turn the ignition switch to ON and wait at least 5 seconds.	-	DTC is stored until it is cleared using the GTS.
U0131	Lost Communication With Power Steering Control Module	The air conditioning amplifier assembly does not receive data from the power steering ECU assembly for 5 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the air conditioning amplifier assembly is 10 V or more.	Turn the ignition switch to ON and wait at least 5 seconds.	-	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication With Body Control Module "B"	The air conditioning amplifier assembly does not receive data from the main body ECU (multiplex network body ECU) for 5 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the air conditioning amplifier assembly is 10 V or more.	Turn the ignition switch to ON and wait at least 5 seconds.	-	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication With Instrument Panel Cluster (IPC) Control Module	The air conditioning amplifier assembly does not receive data from the combination meter assembly for 5 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the air conditioning amplifier assembly is 10 V or more.	Turn the ignition switch to ON and wait at least 5 seconds.	-	DTC is stored until it is cleared using the GTS.

Navigation Receiver Assembly / GTS Display "Navigation System"

Body Electrical > Navigation System > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: w/ Toyota Parking Assist-sensor System
*2: w/o Toyota Parking Assist-sensor System

Navigation Receiver Assembly / GTS Display "Navigation System"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0073	Sending Malfunction (Navigation to APGS)	The navigation receiver assembly does not send/receive data for 5 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the navigation receiver assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 6 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0100	Engine ECU Communication	Either of the following conditions is met: The navigation receiver assembly does not receive data from the ECM for 12 seconds or more.1 The navigation receiver assembly does not receive data from the ECM for 4 seconds or more.2	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the navigation receiver assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 13 seconds.1 Turn the ignition switch to ON and wait at least 5 seconds.2	-	DTC is stored until it is cleared using the GTS.
U0140	Lost Communication with Body Control Module	The navigation receiver assembly does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the navigation receiver assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 11 seconds.	-	DTC is stored until it is cleared using the GTS.
U0155	Meter ECU Communication	The navigation receiver assembly does not receive data from the combination meter assembly for 30 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the navigation receiver assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 31 seconds.	-	DTC is stored until it is cleared using the GTS.

Radio and Display Receiver Assembly / GTS Display "Navigation System"

Body Electrical > Navigation System > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: w/ Toyota Parking Assist-sensor System
*2: w/o Toyota Parking Assist-sensor System

Radio and Display Receiver Assembly / GTS Display "Navigation System"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0073	Sending Malfunction (Navigation to APGS)	The radio and display receiver assembly does not send/receive data for 5 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the radio and display receiver assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 6 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0100	Engine ECU Communication	Either of the following conditions is met: The radio and display receiver assembly does not receive data from the ECM for 12 seconds or more.1 The radio and display receiver assembly does not receive data from the ECM for 4 seconds or more.2	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the radio and display receiver assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 13 seconds.1 Turn the ignition switch to ON and wait at least 5 seconds.2	-	DTC is stored until it is cleared using the GTS.
U0140	Lost Communication with Body Control Module	The radio and display receiver assembly does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the radio and display receiver assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 11 seconds.	-	DTC is stored until it is cleared using the GTS.
U0155	Meter ECU Communication	The radio and display receiver assembly does not receive data from the combination meter assembly for 30 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the radio and display receiver assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 31 seconds.	-	DTC is stored until it is cleared using the GTS.

Combination Meter Assembly / GTS Display "Combination Meter"

Body Electrical > Combination Meter > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: for Navigation Receiver Type
*2: for Radio and Display Type

Combination Meter Assembly / GTS Display "Combination Meter"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The combination meter assembly does not receive data from the ECM for 3 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the combination meter assembly is 11.5 V or more.	Turn the ignition switch to ON and wait at least 4 seconds.	-	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The combination meter assembly does not receive data from the skid control ECU (brake actuator assembly) for 3 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the combination meter assembly is 11.5 V or more.	Turn the ignition switch to ON and wait at least 4 seconds.	-	DTC is stored until it is cleared using the GTS.
U0131	Lost Communication with Power Steering Control Module	The combination meter assembly does not receive data from the power steering ECU assembly for 3 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the combination meter assembly is 11.5 V or more.	Turn the ignition switch to ON and wait at least 4 seconds.	EPS warning light illuminates.	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The combination meter assembly does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the combination meter assembly is 11.5 V or more.	Turn the ignition switch to ON and wait at least 11 seconds.	Tire pressure warning light illuminates.	DTC is stored until it is cleared using the GTS.
U0151	Lost Communication with Restraints Control Module	The combination meter assembly does not receive data from the airbag sensor assembly for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the combination meter assembly is 11.5 V or more.	Turn the ignition switch to ON and wait at least 11 seconds.	SRS warning light illuminates. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0163	Lost Communication With Navigation Control Module	The combination meter assembly does not receive data from the navigation receiver assembly for 3 seconds or more.1 The combination meter assembly does not receive data from the radio and display receiver assembly for 3 seconds or more.2	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the combination meter assembly is 11.5 V or more.	Turn the ignition switch to ON and wait at least 4 seconds.	-	DTC is stored until it is cleared using the GTS.
U0182	Lost Communication with Lighting Control Module Front	The combination meter assembly does not receive data from the headlight leveling ECU assembly for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the combination meter assembly is 11.5 V or more.	Turn the ignition switch to ON and wait at least 11 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U023A	Lost Communication with Front Camera Module	The combination meter assembly does not receive data from the forward recognition camera for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the combination meter assembly is 11.5 V or more.	Turn the ignition switch to ON and wait at least 11 seconds.	Lane departure alert indicator light illuminates. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U1104	Lost Communication with Driving Support ECU	The combination meter assembly does not receive data from the driving support ECU assembly for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the combination meter assembly is 11.5 V or more.	Turn the ignition switch to ON and wait at least 11 seconds.	PCS warning light flashes. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Outer Mirror Control ECU Assembly (for Front Passenger Side) / GTS Display "Mirror R" (for LHD), "Mirror L" (for RHD)

Body Electrical > Mirror R > Trouble Codes
Body Electrical > Mirror L > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Outer Mirror Control ECU Assembly (for Front Passenger Side) / GTS Display "Mirror R" (for LHD), "Mirror L" (for RHD)
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0142	Lost Communication With Body Control Module ''B''	The outer mirror control ECU assembly (for front passenger side) does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected. The power source voltage of the outer mirror control ECU assembly (for front passenger side) is 10 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	-	DTC is stored until it is cleared using the GTS.

Outer Mirror Control ECU Assembly (for Driver Side) / GTS Display "Mirror L" (for LHD), "Mirror R" (for RHD)

Body Electrical > Mirror L > Trouble Codes
Body Electrical > Mirror R > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Outer Mirror Control ECU Assembly (for Driver Side) / GTS Display "Mirror L" (for LHD), "Mirror R" (for RHD)
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0142	Lost Communication With Body Control Module ''B''	The outer mirror control ECU assembly (for driver side) does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.	Both conditions are met: Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected. The power source voltage of the outer mirror control ECU assembly (for driver side) is 10 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	-	DTC is stored until it is cleared using the GTS.

Multiplex Network Door ECU / GTS Display "Back Door"

Body Electrical > Back Door > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Multiplex Network Door ECU / GTS Display "Back Door"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0101	Lost Communication with TCM	The multiplex network door ECU does not receive data from the ECM for 10 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the multiplex network door ECU is 10.5 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	-	DTC is stored until it is cleared using the GTS.
U0122	Lost Communication with Vehicle Dynamics Control Module	The multiplex network door ECU does not receive data from the skid control ECU (brake actuator assembly) for 10 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the multiplex network door ECU is 10.5 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	-	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The multiplex network door ECU does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the multiplex network door ECU is 10.5 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	-	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	The multiplex network door ECU does not receive data from the combination meter assembly for 10 seconds or more.	Both conditions are met: The ignition switch is ON. The power source voltage of the multiplex network door ECU is 10.5 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	-	DTC is stored until it is cleared using the GTS.

ECM (for 2GR-FKS) / GTS Display "Radar Cruise1"

Powertrain > Radar Cruise1 > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

ECM (for 2GR-FKS) / GTS Display "Radar Cruise1"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U012287	Lost Communication with Vehicle Dynamics Control Module Missing Message	The ECM does not receive data from the skid control ECU (brake actuator assembly) for 2.65 seconds or more.	All conditions are met: The ignition switch is ON for 1 second or more. Cruise control main switch is on. The power source voltage of the ECM is 10.5 V or more.	Allow the cruise control system to operate for 2.65 seconds or more.	-	DTC is stored until it is cleared using the GTS.

ECM (for 1AR-FE) / GTS Display "Radar Cruise1"

Powertrain > Radar Cruise1 > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

ECM (for 1AR-FE) / GTS Display "Radar Cruise1"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The skid control ECU (brake actuator assembly) does not receive data from the ECM for 1 second or more.	Both conditions are met: The ignition switch is ON. The radar cruise control system (vehicle control mode) is operating.	Allow the radar cruise control system (vehicle control mode) to operate for 1 second or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0122	Lost Communication with Vehicle Dynamics Control Module	The ECM does not receive data from the skid control ECU (brake actuator assembly) for 2.65 seconds or more.	Both conditions are met: The ignition switch is ON. The radar cruise control system (vehicle control mode) is operating.	Allow the radar cruise control system (vehicle control mode) to operate for 2.65 seconds or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U1104	Lost Communication with Distance Control Module	The driving support ECU assembly data sent to the ECM, skid control ECU (brake actuator assembly) or millimeter wave radar sensor assembly is lost for 1.02 seconds or more.	Both conditions are met: The ignition switch is ON. The radar cruise control system (vehicle control mode) is operating.	Allow the radar cruise control system (vehicle control mode) to operate for 1.02 seconds or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

ECM (for 2GR-FKS) / GTS Display "Radar Cruise1"

Powertrain > Radar Cruise1 > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

ECM (for 2GR-FKS) / GTS Display "Radar Cruise1"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U010087	Lost Communication with ECM/PCM "A" Missing Message	The skid control ECU (brake actuator assembly) does not receive data from the ECM for 1 second or more.	Both conditions are met: The ignition switch is ON. The radar cruise control system (vehicle control mode) is operating.	Allow the radar cruise control system (vehicle control mode) to operate for 1 second or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U012287	Lost Communication with Vehicle Dynamics Control Module Missing Message	The ECM does not receive data from the skid control ECU (brake actuator assembly) for 2.65 seconds or more.	Both conditions are met: The ignition switch is ON. The radar cruise control system (vehicle control mode) is operating.	Allow the radar cruise control system (vehicle control mode) to operate for 2.65 seconds or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U110487	Lost Communication with Driving Support ECU Missing Message	The driving support ECU assembly data sent to the ECM, skid control ECU (brake actuator assembly) or millimeter wave radar sensor assembly is lost for 1.02 seconds or more.	Both conditions are met: The ignition switch is ON. The radar cruise control system (vehicle control mode) is operating.	Allow the radar cruise control system (vehicle control mode) to operate for 1.02 seconds or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Driving Support ECU Assembly / GTS Display "Radar Cruise2"

Powertrain > Radar Cruise2 > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*: Refer to Dynamic Radar Cruise Control System.

for 1AR-FE

Click here
for 2GR-FKS

Click here

Driving Support ECU Assembly / GTS Display "Radar Cruise2"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The driving support ECU assembly does not receive data from the ECM for 0.92 seconds or more.	All conditions are met: The ignition switch is ON for 1 second or more. Vehicle speed is 36 km/h (22 mph) or more. The power source voltage of the driving support ECU assembly is 10 V or more. The cruise control main switch is on.	Turn the cruise control main switch on and drive the vehicle at a speed of 36 km/h (22 mph) or more for 1.92 seconds or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0125	Lost Communication with Yaw Rate Sensor Module	The driving support ECU assembly does not receive data from the airbag sensor assembly for 0.72 seconds or more.	All conditions are met: The ignition switch is ON for 3 seconds or more. Vehicle speed is 36 km/h (22 mph) or more. The power source voltage of the driving support ECU assembly is 10 V or more. The cruise control main switch is on.	Turn the cruise control main switch on and drive the vehicle at a speed of 36 km/h (22 mph) or more for 3.72 seconds or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The driving support ECU assembly does not receive data from the steering sensor for 0.72 seconds or more.	All conditions are met: The ignition switch is ON for 1 second or more. Vehicle speed is 36 km/h (22 mph) or more. The power source voltage of the driving support ECU assembly is 10 V or more. The cruise control main switch is on.	Turn the cruise control main switch on and drive the vehicle at a speed of 36 km/h (22 mph) or more for 1.72 seconds or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The driving support ECU assembly does not receive data from the skid control ECU (brake actuator assembly) for 1.08 seconds or more.	All conditions are met: The ignition switch is ON for 2 seconds or more. Vehicle speed is 36 km/h (22 mph) or more. The power source voltage of the driving support ECU assembly is 10 V or more. The cruise control main switch is on.	Turn the cruise control main switch on and drive the vehicle at a speed of 36 km/h (22 mph) or more for 3.08 seconds or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0235*	Lost Communication with Cruise Control Front Distance Range Sensor	The driving support ECU assembly does not receive data from the millimeter wave radar sensor assembly for 1.6 seconds or more.	All conditions are met: The ignition switch is ON for 1 second or more. Vehicle speed is 36 km/h (22 mph) or more. The power source voltage of the driving support ECU assembly is 10 V or more. The cruise control main switch is on.	Turn the cruise control main switch on and drive the vehicle at a speed of 36 km/h (22 mph) or more for 2.6 seconds or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U1104*	Lost Communication with Driving Support ECU	The driving support ECU assembly does not receive data from the millimeter wave radar sensor assembly for 0.144 seconds or more.	All conditions are met: The ignition switch is ON for 1 second or more. Vehicle speed is 36 km/h (22 mph) or more. The power source voltage of the driving support ECU assembly is 10 V or more. The cruise control main switch is on.	Turn the cruise control main switch on and drive the vehicle at a speed of 36 km/h (22 mph) or more for 1.144 seconds or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Driving Support ECU Assembly / GTS Display "Pre-Collision 2"

Body Electrical > Pre-Collision 2 > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*: Refer to Pre-Collision System.

Click here

Driving Support ECU Assembly / GTS Display "Pre-Collision 2"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The driving support ECU assembly does not receive data from the ECM for 5.12 seconds or more.	All conditions are met: The ignition switch is ON for 3 seconds or more. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the driving support ECU assembly is 10 V or more.	Drive the vehicle at a speed of 5 km/h (3 mph) or more for 8.12 seconds or more.	Displays messages on the multi-information display. PCS indicator light blinks.	DTC is stored until it is cleared using the GTS.
U0125	Lost Communication with Yaw Rate Sensor Module	The driving support ECU assembly does not receive data from the airbag sensor assembly for 0.72 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the driving support ECU assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least 3.72 seconds.	Displays messages on the multi-information display. PCS indicator light blinks.	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The driving support ECU assembly does not receive data from the steering sensor for 5.04 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the driving support ECU assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least 6.04 seconds.	Displays messages on the multi-information display. PCS indicator light blinks.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The driving support ECU assembly does not receive data from the skid control ECU (brake actuator assembly) for 4.92 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the driving support ECU assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least 6.92 seconds.	Displays messages on the multi-information display. PCS indicator light blinks.	DTC is stored until it is cleared using the GTS.
U0235*	Lost Communication with Cruise Control Front Distance Range Sensor	The driving support ECU assembly does not receive data from the millimeter wave radar sensor assembly for 0.3 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the driving support ECU assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least 3.3 seconds.	Displays messages on the multi-information display. PCS indicator light blinks.	DTC is stored until it is cleared using the GTS.
U023A*	Lost Communication with Image Processing Module "A"	The driving support ECU assembly does not receive data from the forward recognition camera for 3 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the driving support ECU assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least 6 seconds.	Displays messages on the multi-information display. PCS indicator light blinks.	DTC is stored until it is cleared using the GTS.
U1002*	Lost Communication with Gateway Module	The driving support ECU assembly does not receive data from the millimeter wave radar sensor assembly and forward recognition camera for 0.5 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the driving support ECU assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least 3.5 seconds.	Displays messages on the multi-information display. PCS indicator light blinks.	DTC is stored until it is cleared using the GTS.
U1104*	Lost Communication with Driving Support ECU	Either of the following conditions is met: The millimeter wave radar sensor assembly or forward recognition camera does not receive data from the driving support ECU assembly for 0.224 seconds or more. The skid control ECU (brake actuator assembly) does not receive data from the driving support ECU assembly for 1.456 seconds or more.	Both conditions are met: The ignition switch is ON for 2 seconds or more. The power source voltage of the driving support ECU assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least 3.456 seconds.	Displays messages on the multi-information display. PCS indicator light blinks.	DTC is stored until it is cleared using the GTS.

Clearance Warning ECU Assembly / GTS Display "Clearance Sonar"

Body Electrical > Clearance Sonar > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Clearance Warning ECU Assembly / GTS Display "Clearance Sonar"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0101	Lost Communication with TCM	The clearance warning ECU assembly does not receive data from the ECM for 5 seconds or more.	Both conditions are met: The ignition switch is ON for 5 seconds or more. The power source voltage of the clearance warning ECU assembly is 10.2 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	-	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication With Instrument Panel Cluster (IPC) Control Module	The clearance warning ECU assembly does not receive data from the combination meter assembly for 5 seconds or more.	Both conditions are met: The ignition switch is ON for 5 seconds or more. The power source voltage of the clearance warning ECU assembly is 10.2 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	-	DTC is stored until it is cleared using the GTS.

4WD ECU Assembly / GTS Display "Four Wheel Drive"

Chassis > Four Wheel Drive > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

4WD ECU Assembly / GTS Display "Four Wheel Drive"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0073	Control Module Communication Bus Off	The 4WD ECU assembly keeps sending data to an ECU or a sensor for 5 seconds or more because a receive completion signal is not received.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the 4WD ECU assembly is 10 V or more.	Turn the ignition switch to ON and wait at least 6 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0100	Lost Communication With ECM/PCM "A"	The 4WD ECU assembly does not receive data from the ECM for 3.5 seconds or more.	All conditions are met: The ignition switch is ON for 1 second or more. Vehicle speed is 60 km/h (37 mph) or more. The power source voltage of the 4WD ECU assembly is 10 V or more.	Drive the vehicle at a speed of 60 km/h (37 mph) or more for 4.5 seconds or more.	-	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication With Steering Angle Sensor Module	Either of the following conditions is met: The 4WD ECU assembly does not receive data from the steering sensor for 1 second or more. condition occurs 10 times or more within 60 seconds: The 4WD ECU assembly does not receive data from the steering sensor once or more within 5 seconds.	Both conditions are met: The ignition switch is ON for 1 second or more. The power source voltage of the 4WD ECU assembly is 10 V or more.	Turn the ignition switch to ON and wait at least 60 seconds.	-	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication With Brake System Control Module	The 4WD ECU assembly does not receive data from the skid control ECU (brake actuator assembly) for 8 seconds or more.	Both conditions are met: The ignition switch is ON for 2 seconds or more. The power source voltage of the 4WD ECU assembly is 10 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Blind Spot Monitor Sensor LH / GTS Display "Blind Spot Monitor Master"

Body Electrical > Blind Spot Monitor Master > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*: If U0232 or U1331 is output alone, the CAN communication is normal.

(Click here for U0232, Click here for U1331

Blind Spot Monitor Sensor LH / GTS Display "Blind Spot Monitor Master"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The blind spot monitor sensor LH does not receive data from the ECM for 10.84 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch to ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait at least 13.84 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0125	Lost Communication with Yaw Rate Sensor Module	The blind spot monitor sensor LH does not receive data from the airbag sensor assembly for 3.06 seconds or more.	All conditions are met: The ignition switch is ON for 3 seconds or more. Vehicle speed is 7 km/h (4 mph) or more. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the blind spot monitor main switch on and then drive the vehicle at a speed of 7 km/h (or 4 mph) or more for 6.06 seconds or more.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The blind spot monitor sensor LH does not receive data from the steering sensor for 10.68 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch to ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait at least 13.68 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The blind spot monitor sensor LH does not receive data from the skid control ECU (brake actuator assembly) for 3.036 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch to ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait at least 6.036 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The blind spot monitor sensor LH does not receive data from the main body ECU (multiplex network body ECU) for 10.6 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch to ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait at least 13.6 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0232*	Lost Communication with Blind Spot Monitor Slave Module	The blind spot monitor sensor LH does not receive data from the blind spot monitor sensor RH for 10.6 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch to ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait at least 13.6 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U1331*	Software Incompatibility with Body Control Module "B"	Destination information of the main body ECU (multiplex network body ECU) and blind spot monitor sensor do not match.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the blind spot monitor sensor LH is 10 V or more.	Turn the ignition switch to ON, turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait at least 3 seconds.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Forward Recognition Camera / GTS Display "LKA/LDA"

Chassis > LKA/LDA > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*: Refer to Lane Departure Alert System.

Click here

Forward Recognition Camera / GTS Display "LKA/LDA"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The forward recognition camera does not receive data from the ECM for 5 seconds or more.	All conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The LDA main switch is on. Vehicle speed is 1 km/h (or 1 mph) or more.	Turn the LDA main switch on and then drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more.	Lane departure alert indicator light illuminates yellow. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0101	Lost Communication with TCM	The forward recognition camera does not receive data from the ECM for 5 seconds or more.	All conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The LDA main switch is on. Vehicle speed is 1 km/h (or 1 mph) or more.	Turn the LDA main switch on and then drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more.	Lane departure alert indicator light illuminates yellow. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0123	Lost Communication with Yaw Rate Sensor Module	The forward recognition camera does not receive data from the airbag sensor assembly for 5 seconds or more.	All conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The LDA main switch is on. Vehicle speed is 1 km/h (or 1 mph) or more.	Turn the LDA main switch on and then drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more.	Lane departure alert indicator light illuminates yellow. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The forward recognition camera does not receive data from the steering sensor for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The LDA main switch is on.	Turn the ignition switch to ON, turn the LDA main switch on and wait for at least 7 seconds.	Lane departure alert indicator light illuminates yellow. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The forward recognition camera does not receive data from the skid control ECU (brake actuator assembly) for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The LDA main switch is on.	Turn the ignition switch to ON, turn the LDA main switch on and wait for at least 7 seconds.	Lane departure alert indicator light illuminates yellow. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0131	Lost Communication with Power Steering Control Module	The forward recognition camera does not receive data from the power steering ECU assembly for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The LDA main switch is on.	Turn the ignition switch to ON, turn the LDA main switch on and wait for at least 7 seconds.	Lane departure alert indicator light illuminates yellow. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The forward recognition camera does not receive data from the main body ECU (multiplex network body ECU) for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The LDA main switch is on.	Turn the ignition switch to ON, turn the LDA main switch on and wait for at least 7 seconds.	Lane departure alert indicator light illuminates yellow. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter)	The forward recognition camera does not receive data from the combination meter assembly for 50 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The LDA main switch is on.	Turn the ignition switch to ON, turn the LDA main switch on and wait for at least 52 seconds.	Lane departure alert indicator light illuminates yellow. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0235*	Lost Communication with Cruise Control Front Distance Range Sensor	The forward recognition camera does not receive data from the millimeter wave radar sensor assembly for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The LDA main switch is on.	Turn the ignition switch to ON, turn the LDA main switch on and wait for at least 7 seconds.	Lane departure alert indicator light illuminates yellow. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U023A*	Lost Communication with Image Processing Module "A"	The power steering ECU assembly does not receive data from the forward recognition camera for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The LDA main switch is on.	Turn the ignition switch to ON, turn the LDA main switch on and wait for at least 7 seconds.	Lane departure alert indicator light illuminates yellow. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U1104*	Lost Communication with Driving Support ECU	The forward recognition camera does not receive data from the driving support ECU assembly for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The LDA main switch is on.	Turn the ignition switch to ON, turn the LDA main switch on and wait for at least 7 seconds.	Lane departure alert indicator light illuminates yellow. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Forward Recognition Camera / GTS Display "Front Recognition Camera"

Chassis > Front Recognition Camera > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*1: Refer to Front Recognition Camera System.

Click here
*2: Blinks when the pre-collision system is malfunctioning.
*3: w/ Automatic High Beam System

Forward Recognition Camera / GTS Display "Front Recognition Camera"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The forward recognition camera does not receive data from the ECM for 5 seconds or more.	All conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Vehicle speed is 1 km/h (or 1 mph) or more. Automatic high beam main switch is on.*3	Turn the automatic high beam main switch on and then drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more.	Displays messages on the multi-information display. PCS indicator light blinks.2 Master warning light illuminates.3	DTC is stored until it is cleared using the GTS.
U0101*3	Lost Communication with TCM	The forward recognition camera does not receive data from the ECM for 5 seconds or more.	All conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Vehicle speed is 1 km/h (or 1 mph) or more. Automatic high beam main switch is on.	Turn the automatic high beam main switch on and then drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more.	Displays messages on the multi-information display. Master warning light illuminates.	DTC is stored until it is cleared using the GTS.
U0123	Lost Communication with Yaw Rate Sensor Module	The forward recognition camera does not receive data from the airbag sensor assembly for 5 seconds or more.	All conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Vehicle speed is 1 km/h (or 1 mph) or more. Automatic high beam main switch is on.*3	Turn the automatic high beam main switch on and then drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more.	Displays messages on the multi-information display. PCS indicator light blinks.2 Master warning light illuminates.3	DTC is stored until it is cleared using the GTS.
U0126*3	Lost Communication with Steering Angle Sensor Module	The forward recognition camera does not receive data from the steering sensor for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Automatic high beam main switch is on.	Turn the ignition switch to ON, turn the automatic high beam main switch on and wait for at least 7 seconds.	Displays messages on the multi-information display. Master warning light illuminates.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The forward recognition camera does not receive data from the skid control ECU (brake actuator assembly) for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Automatic high beam main switch is on.*3	Turn the ignition switch to ON, turn the automatic high beam main switch on and wait for at least 7 seconds.	Displays messages on the multi-information display. PCS indicator light blinks.2 Master warning light illuminates.3	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The forward recognition camera does not receive data from the main body ECU (multiplex network body ECU) for 5 seconds or more.	The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.	Turn the ignition switch to ON and wait for at least 7 seconds.	Displays messages on the multi-information display. PCS indicator light blinks.	DTC is stored until it is cleared using the GTS.
U0235*1	Lost Communication with Cruise Control Front Distance Range Sensor	The forward recognition camera does not receive data from the millimeter wave radar sensor assembly for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Automatic high beam main switch is on.*3	Turn the ignition switch to ON, turn the automatic high beam main switch on and wait for at least 7 seconds.	Displays messages on the multi-information display. PCS indicator light blinks.2 Master warning light illuminates.3	DTC is stored until it is cleared using the GTS.
U1104*1	Lost Communication with Driving Support ECU	The forward recognition camera does not receive data from the driving support ECU assembly for 5 seconds or more.	The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.	Turn the ignition switch to ON and wait for at least 7 seconds.	Displays messages on the multi-information display. PCS indicator light blinks.*2	DTC is stored until it is cleared using the GTS.

Forward Recognition Camera / GTS Display "Road Sign Assist"

Body Electrical > Road Sign Assist > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Forward Recognition Camera / GTS Display "Road Sign Assist"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	The forward recognition camera does not receive data from the ECM for 5 seconds or more.	All conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Vehicle speed is 1 km/h (or 1 mph) or more. The road sign assist system is operating.	Drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more.	Master warning light illuminates. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0101	Lost Communication with TCM	The forward recognition camera does not receive data from the ECM for 5 seconds or more.	All conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Vehicle speed is 1 km/h (or 1 mph) or more. The road sign assist system is operating.	Drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more.	Master warning light illuminates. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0123	Lost Communication with Yaw Rate Sensor Module	The forward recognition camera does not receive data from the airbag sensor assembly for 5 seconds or more.	All conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Vehicle speed is 1 km/h (or 1 mph) or more. The road sign assist system is operating.	Drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more.	Master warning light illuminates. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The forward recognition camera does not receive data from the skid control ECU (brake actuator assembly) for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The road sign assist system is operating.	Turn the ignition switch to ON and wait at least 7 seconds.	Master warning light illuminates. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0142	Lost Communication with Body Control Module "B"	The forward recognition camera does not receive data from the main body ECU (multiplex network body ECU) for 5 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The road sign assist system is operating.	Turn the ignition switch to ON and wait at least 7 seconds.	Master warning light illuminates. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter)	The forward recognition camera does not receive data from the combination meter assembly for 50 seconds or more.	Both conditions are met: The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. The road sign assist system is operating.	Turn the ignition switch to ON and wait at least 52 seconds.	Master warning light illuminates. Displays messages on the multi-information display.	DTC is stored until it is cleared using the GTS.

Telematics Transceiver / GTS Display "Telematics"

Tech Tips

This ECU uses the CAN communication system for DTC communication.

Telematics Transceiver / GTS Display "Telematics"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0100	Engine ECU Communication	The telematics transceiver does not receive data from the ECM for 15 seconds or more.	The ignition switch is ON for 10 seconds or more.	Turn the ignition switch to ON and wait at least 25 seconds.	-	DTC is stored until it is cleared using the GTS.

Parking Assist ECU / GTS Display "Panoramic View Monitor"

Chassis > Panoramic View Monitor > Trouble Codes

Tech Tips

This ECU uses the CAN communication system for DTC communication.
*: Refer to Panoramic View Monitor System.

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Parking Assist ECU / GTS Display "Panoramic View Monitor"
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Indication in Meter	DTC Storage Method
U0073	Control Module Communication Bus Off	The parking assist ECU does not send/receive data for 13 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the parking assist ECU is 7.5 V or more.	Turn the ignition switch to ON and wait at least 16 seconds.	-	DTC is stored until it is cleared using the GTS.
U0100	Lost Communication with ECM/PCM "A"	The parking assist ECU does not receive data from the ECM for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the parking assist ECU is 7.5 V or more.	Turn the ignition switch to ON and wait at least 13 seconds.	-	DTC is stored until it is cleared using the GTS.
U0126	Lost Communication with Steering Angle Sensor Module	The parking assist ECU does not receive data from the steering sensor for 12 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the parking assist ECU is 7.5 V or more.	Turn the ignition switch to ON and wait at least 15 seconds.	-	DTC is stored until it is cleared using the GTS.
U0129	Lost Communication with Brake System Control Module	The parking assist ECU does not receive data from the skid control ECU (brake actuator assembly) for 10 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the parking assist ECU is 7.5 V or more.	Turn the ignition switch to ON and wait at least 13 seconds.	-	DTC is stored until it is cleared using the GTS.
U0140	Lost Communication with Body Control Module	The parking assist ECU does not receive data from the main body ECU (multiplex network body ECU) for 11 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the parking assist ECU is 7.5 V or more.	Turn the ignition switch to ON and wait at least 14 seconds.	-	DTC is stored until it is cleared using the GTS.
U0233	Lost Communication with Blind Spot Monitor Master Module	The parking assist ECU does not receive data from the blind spot monitor sensor LH for 11 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the parking assist ECU is 7.5 V or more.	Turn the ignition switch to ON and wait at least 14 seconds.	-	DTC is stored until it is cleared using the GTS.
U1000*	CAN Communication Failure (Message Registry)	The parking assist ECU does not send/receive data.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the parking assist ECU is 7.5 V or more.	Turn the ignition switch to ON and wait at least 3 seconds.	-	DTC is stored until it is cleared using the GTS.
U1110	Lost Communication with Clearance Sonar Module	The parking assist ECU does not receive data from the clearance warning ECU assembly for 11 seconds or more.	Both conditions are met: The ignition switch is ON for 3 seconds or more. The power source voltage of the parking assist ECU is 7.5 V or more.	Turn the ignition switch to ON and wait at least 14 seconds.	-	DTC is stored until it is cleared using the GTS.

Central Gateway ECU (Network Gateway ECU) / GTS Display "Central Gateway"

Tech Tips

The central gateway ECU (network gateway ECU) is connected to the CAN communication system, but the central gateway ECU (network gateway ECU) does not store or output CAN communication DTCs.
Steering Sensor / GTS Display "-"

Tech Tips

The steering sensor is connected to the CAN communication system, but the steering sensor does not store or output CAN communication DTCs.
Position Control ECU and Switch Assembly / GTS Display "Driver Seat"

Tech Tips

The position control ECU and switch assembly is connected to the CAN communication system, but the position control ECU and switch assembly does not store or output CAN communication DTCs.
Airbag Sensor Assembly / GTS Display "SRS Airbag"

Tech Tips

The airbag sensor assembly is connected to the CAN communication system, but the airbag sensor assembly does not store or output CAN communication DTCs.
Millimeter Wave Radar Sensor Assembly / GTS Display "-"

Tech Tips

The millimeter wave radar sensor assembly is connected to the CAN communication system, but the millimeter wave radar sensor assembly does not store or output CAN communication DTCs.

CAN BUS WAVEFORMS

Tech Tips

The following waveforms are measured between terminals CANH and GND, and terminals CANL and GND of the central gateway ECU (network gateway ECU). (Use this as a reference for diagnosis of CAN communication lines.)
When malfunctions in multiple ECUs are suspected based on the CAN bus check and DTCs checked using the GTS, check the resistance of the CAN bus using an ohmmeter first. If no problems are found, check the following waveforms.

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If a waveform is not similar to one of the following 3 patterns (Group 1), then an open in a CAN main bus line, an open in a CAN branch line, or a short between a CAN line (CANH or CANL) and ground is suspected (Group 2).
Wiggle the connector and wire harness to check if the waveform changes.

CAN bus waveforms (Group 1)


*a	1 V/DIV.
*b	50 μs/DIV.

Normal waveform


*a	1 V/DIV.
*b	50 μs/DIV.

Open in both of the lines (CANH and CANL) of a CAN branch

Tech Tips

Waveforms (waveforms shown using dotted lines) are not present from an ECU or sensor connected to a CAN branch with an open circuit in both lines. (Waveforms from other ECUs or sensors are normal.)
Because this waveform is similar to a normal waveform, instead of using the waveform, the malfunctioning part can be narrowed down by performing a CAN bus check.


*a	1 V/DIV.
*b	50 μs/DIV.

Short between the CAN bus lines (CANH and CANL)

Tech Tips

Waveforms disappear.
If the malfunction is in an ECU, disconnecting the ECU will change the waveform. If the waveform does not change, a malfunction in the wire harness is suspected.

CAN bus waveforms (reference) (Group 2)

Note

The following CAN bus waveforms can be used only as reference. The actual measured waveform may differ significantly depending on the location of the open or short circuit.


*a	1 V/DIV.
*b	50 μs/DIV.

Open in a CAN branch line (CANH)

Tech Tips

An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.
Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.


*a	1 V/DIV.
*b	50 μs/DIV.

Open in a CAN branch line (CANL)

Tech Tips

An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.
Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.


*a	1 V/DIV.
*b	50 μs/DIV.

Open in a CAN main bus line (CANH)

Tech Tips

Waveforms of ECUs or sensors that are closer to the central gateway ECU (network gateway ECU) than the open part are almost normal.
Waveforms of ECUs or sensors that are on the opposite side of the central gateway ECU (network gateway ECU) from the open part are abnormal.
An open in a CAN main bus line can be confirmed by measuring the resistance between the CANH and CANL terminals of any CAN branch.


*a	1 V/DIV.
*b	50 μs/DIV.

Short between a CAN bus line (CANH) and ground

Tech Tips

Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.
A short to ground in the CANH line can be confirmed by measuring the resistance between CANH and ground using an ohmmeter.


*a	1 V/DIV.
*b	50 μs/DIV.

Short between a CAN bus line (CANL) and ground

Tech Tips

Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.
A short to ground in the CANL line can be confirmed by measuring the resistance between CANL and ground using an ohmmeter.

DATA SENDING/RECEIVING TABLE

Data sending/receiving table

Tech Tips

If Data List items related to sent/received data are not displayed properly, the part for which communication is interrupted can be determined using the table below.

Data Content	Data Detected and Sent by	Data Received by		Relevant Data List Item
Data Content	Data Detected and Sent by	Can be Checked in the Data List	Cannot be Checked in the Data List	Selected System*7	Data List Item
Accelerator position	ECM	Skid control ECU (brake actuator assembly)	Navigation receiver assembly Radio and display receiver assembly Power steering ECU assembly 4WD ECU assembly Driving support ECU assembly Forward recognition camera	Engine and ECT	Accelerator Position
				Engine	Accelerator Position
				ABS/VSC/TRC	Accelerator Opening Angle %
Engine speed	ECM	Power steering ECU assembly Certification ECU (smart key ECU assembly) Combination meter assembly Skid control ECU (brake actuator assembly)	Navigation receiver assembly Radio and display receiver assembly Airbag sensor assembly Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) 4WD ECU assembly	Engine and ECT	Engine Speed
				Engine	Engine Speed
				EMPS	Engine Revolution
				Power Source Control	Engine Condition
				Starting Control	Engine Speed
				Combination Meter	Engine Rpm
				ABS/VSC/TRC	Engine Revolutions
Engine coolant temperature	ECM	Air conditioning amplifier assembly 4WD ECU assembly Combination meter assembly	Navigation receiver assembly Radio and display receiver assembly Skid control ECU (brake actuator assembly)	Engine and ECT	Coolant Temp
				Engine	Coolant Temperature
				Air Conditioner	Engine Coolant Temp
				Four Wheel Drive	Engine Coolant Temperature
				Combination Meter	Coolant Temperature
Vehicle speed	Skid control ECU (brake actuator assembly)	Navigation receiver assembly Radio and display receiver assembly ECM Power steering ECU assembly Combination meter assembly*3 Blind spot monitor sensor LH Television camera assembly Parking assist ECU	Telematics transceiver Airbag sensor assembly Main body ECU (multiplex network body ECU) Driving support ECU assembly Forward recognition camera	ABS/VSC/TRC	Vehicle Speed
				Navigation System	Vehicle Speed
				Engine and ECT	Vehicle Speed
				Engine	Vehicle Speed
				EMPS	Meter Vehicle Velocity
				Combination Meter	Vehicle Speed Meter
				Blind Spot Monitor Master	Vehicle Speed
				IPA/Parking Assist Monitor	Wheel Speed Sensor (4wheel)
				Panoramic View Monitor	Wheel Speed Sensor (4wheel)
	Combination meter assembly*3	Position control ECU and switch assembly Clearance warning ECU assembly Certification ECU (smart key ECU assembly)	Multiplex network door ECU Air conditioning amplifier assembly Main body ECU (multiplex network body ECU)	Combination Meter	Vehicle Speed Meter
				Driver Seat	Vehicle Speed
				Clearance Sonar	Vehicle Speed Info
				Power Source Control	Vehicle Speed Signal
Wheel speed	Skid control ECU (brake actuator assembly)	Headlight leveling ECU assembly 4WD ECU assembly	Airbag sensor assembly ECM Power steering ECU assembly Blind spot monitor sensor LH Driving support ECU assembly Forward recognition camera	ABS/VSC/TRC	FR Wheel Speed
					FL Wheel Speed
					RR Wheel Speed
					RL Wheel Speed
				HL AutoLeveling	Front Right Wheel Speed Value
				HL AutoLeveling	Front Left Wheel Speed Value
				Four Wheel Drive	FR Wheel Speed
					FL Wheel Speed
					RR Wheel Speed
					RL Wheel Speed
Shift position	ECM	Navigation receiver assembly Radio and display receiver assembly Position control ECU and switch assembly Clearance warning ECU assembly Certification ECU (smart key ECU assembly) Blind spot monitor sensor LH	Multiplex network door ECU Airbag sensor assembly Main body ECU (multiplex network body ECU) Combination meter assembly*2 Television camera assembly Driving support ECU assembly Forward recognition camera Parking assist ECU	Engine and ECT	Neutral Position SW Signal
				Engine	Neutral Position SW
				Navigation System	Reverse Signal
				Driver Seat	P Switch
				Clearance Sonar	Parking Signal
				Clearance Sonar	Reverse Signal
				Power Source Control	Shift P Signal
				Blind Spot Monitor Master	Reverse (Only for AT/CVT)
Ambient temperature	Air conditioning amplifier assembly	ECM 4WD ECU assembly Combination meter assembly	Navigation receiver assembly Radio and display receiver assembly Main body ECU (multiplex network body ECU) Skid control ECU (brake actuator assembly) Driving support ECU assembly Forward recognition camera	Air Conditioner	Ambient Temp Sensor
				Engine and ECT	Ambient Temp for A/C
				Engine	Ambient Temp for A/C
				Four Wheel Drive	Ambient Temperature
				Combination Meter	Ambient Temperature
Driver door courtesy switch	Main body ECU (multiplex network body ECU)	-	Navigation receiver assembly Radio and display receiver assembly Certification ECU (smart key ECU assembly) Combination meter assembly*2 Forward recognition camera Parking assist ECU	Main Body	FL Door Courtesy SW
Driver door courtesy switch	Main body ECU (multiplex network body ECU)	-		Main Body	FR Door Courtesy SW
Steering angle sensor	Steering sensor	Power steering ECU assembly 4WD ECU assembly Skid control ECU (brake actuator assembly) Blind spot monitor sensor LH	Navigation receiver assembly Radio and display receiver assembly Airbag sensor assembly ECM Television camera assembly Driving support ECU assembly Forward recognition camera Parking assist ECU	EMPS	Steering Angle Velocity
				Four Wheel Drive	Steering Angle Value
				ABS/VSC/TRC	Steering Angle Sensor
				Blind Spot Monitor Master	Steering Angle
Yaw rate sensor	Airbag sensor assembly	4WD ECU assembly Skid control ECU (brake actuator assembly) Blind spot monitor sensor LH	Driving support ECU assembly Forward recognition camera	Four Wheel Drive	Yaw Rate Value
				ABS/VSC/TRC	Yaw Rate Sensor
				Blind Spot Monitor Master	Yaw Rate Sensor
Deceleration Sensor	Airbag sensor assembly	4WD ECU assembly Skid control ECU (brake actuator assembly)	ECM Skid control ECU (brake actuator assembly) Driving support ECU assembly Forward recognition camera	Four Wheel Drive	Lateral G
				Four Wheel Drive	Forward and Rearward G
				ABS/VSC/TRC	Deceleration Sensor
				ABS/VSC/TRC	Deceleration Sensor2
Ignition switch condition	Main body ECU (multiplex network body ECU)	Multiplex network door ECU Position control ECU and switch assembly	Outer mirror control ECU assembly (for driver side) Outer mirror control ECU assembly (for front passenger side) Certification ECU (smart key ECU assembly) Television camera assembly	Main Body	IG SW
				Back Door	IG SW
				Driver Seat	Ignition Switch
Driver side buckle switch signal	Airbag sensor assembly	-	Telematics transceiver Main body ECU (multiplex network body ECU)	SRS Airbag	Left side Buckle SW
Driver side buckle switch signal	Main body ECU (multiplex network body ECU)*4	-	Telematics transceiver Combination meter assembly*2 Forward recognition camera	-	-
Passenger side buckle switch signal	Airbag sensor assembly	Combination meter assembly	Telematics transceiver	SRS Airbag	Right side Buckle SW
Passenger side buckle switch signal	Airbag sensor assembly	Combination meter assembly	Telematics transceiver	Combination Meter	P-Seatbelt Buckle SW
Headlight switch	Main body ECU (multiplex network body ECU)	-	Headlight leveling ECU assembly ECM Blind spot monitor sensor LH Driving support ECU assembly Combination meter assembly	Main Body	Dimmer SW
Headlight switch	Main body ECU (multiplex network body ECU)	-		Main Body	Head Light SW (Tail)
Side turn signal	Combination meter assembly*2	Blind spot monitor sensor LH Forward recognition camera Driving support ECU assembly	-	Blind spot monitor Master	Turn Switch State
				LKA/LDA	Turn Signal Switch (Right)
				LKA/LDA	Turn Signal Switch (Left)
				Pre-Collision 2	Turn Light RH
				Pre-Collision 2	Turn Light LH
ECM power source voltage*1	ECM	-	-	Engine and ECT	Battery Voltage
ECM power source voltage*1	ECM	-	-	Engine	Battery Voltage
Combination meter assembly power source voltage*1	Combination meter assembly	-	-	Combination Meter	+B Voltage Value
Skid control ECU (brake actuator assembly) power source voltage*1	Skid control ECU (brake actuator assembly)	-	-	ABS/VSC/TRC	BS1 Voltage Value
Power steering ECU assembly power source voltage*1	Power steering ECU assembly	-	-	EMPS	IG Power Supply
Navigation receiver assembly power source voltage*1	Navigation receiver assembly	-	-	Navigation System	Battery Voltage
Radio and display receiver assembly power source voltage*1	Radio and display receiver assembly	-	-	Navigation System	Battery Voltage
Solar sensor*1	Air conditioning amplifier assembly	-	-	Air Conditioner	Solar Sensor (D side)
Driver door touch sensor*1	Certification ECU (smart key ECU assembly)	-	-	Entry&Start	D-Door Touch Sensor
Clearance sonar main switch condition*1	Clearance warning ECU assembly	-	-	Clearance Sonar	Main Switch
Transfer control solenoid current*1	4WD ECU assembly	-	-	Four Wheel Drive	SLC Solenoid Current
Blind spot monitor sensor LH power source voltage*1	Blind spot monitor sensor LH	-	-	Blind Spot Monitor Master	Power Supply Voltage
Outer mirror control ECU assembly (for driver side) power source voltage*1	Outer mirror control ECU assembly (for driver side)	-	-	Mirror L5 Mirror R6	+B Voltage Input Value
Outer mirror control ECU assembly (for front passenger side) power source voltage*1	Outer mirror control ECU assembly (for front passenger side)	-	-	Mirror R5 Mirror L6	+B Voltage Input Value
Position control ECU and switch assembly power source voltage*1	Position control ECU and switch assembly	-	-	Driver Seat	Power Voltage
Headlight leveling ECU assembly power source voltage*1	Headlight leveling ECU assembly	-	-	HL AutoLeveling	+B
Panoramic view monitor main switch condition*1	Parking assist ECU	-	-	Panoramic View Monitor	Camera Changing SW Signal Status

*1: Whether the ECU that sends data is functioning or not can be judged by using the GTS to check items such as switches or sensors that send signals to the ECU via direct lines.
*2: Although the received contents cannot be checked in the Data List, whether or not the data is received normally can be checked by observing the combination meter assembly.
*3: The combination meter assembly receives a vehicle speed signal from the skid control ECU (brake actuator assembly) and sends the signal to other ECUs.
*4: The main body ECU (multiplex network body ECU) receives a driver seat buckle switch signal from the airbag sensor assembly and sends the signal to other ECUs.
*5: for LHD
*6: for RHD
*7: According to the display on the GTS, read the Data List.

Enter the following menus: Powertrain / Engine and ECT / Data List.

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Enter the following menus: Powertrain / Engine / Data List.

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Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

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Enter the following menus: Chassis / EMPS / Data List.

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Enter the following menus: Body Electrical / Power Source Control / Data List.

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Enter the following menus: Body Electrical / Starting Control / Data List.

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Enter the following menus: Body Electrical / Combination Meter / Data List.

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Enter the following menus: Body Electrical / Air Conditioner / Data List.

for Automatic Air Conditioning System: Click here

for Manual Air Conditioning System: Click here
Enter the following menus: Chassis / Four Wheel Drive / Data List.

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Enter the following menus: Body Electrical / Navigation System / Data List.

w/o Navigation System for Radio and Display Type: Click here

w/ Navigation System for Radio and Display Type: Click here

for Navigation Receiver Type: Click here
Enter the following menus: Body Electrical / Blind Spot Monitor Master / Data List.

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Enter the following menus: Chassis / IPA/Parking Assist Monitor / Data List.

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Enter the following menus: Body Electrical / Driver Seat / Data List.

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Enter the following menus: Body Electrical / Clearance Sonar / Data List.

for 4 Sensor Type: Click here

for 6 Sensor Type: Click here
Enter the following menus: Body Electrical / HL AutoLeveling / Data List.

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Enter the following menus: Body Electrical / Main Body / Data List.

Click here

Click here
Enter the following menus: Body Electrical / Back Door / Data List.

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Enter the following menus: Body Electrical / SRS Airbag / Data List.

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Enter the following menus: Chassis / LKA/LDA / Data List.

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Enter the following menus: Body Electrical / Pre-Collision 2 / Data List.

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Enter the following menus: Body Electrical / Entry&Start / Data List.

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Enter the following menus: Body Electrical / Mirror L or Mirror R / Data List.

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Enter the following menus: Chassis / Panoramic View Monitor / Data List.

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