DESCRIPTION
If 2 or more ECUs and/or sensors do not appear on the intelligent tester "Bus Check" screen, one side of the CAN branch wire may be open (one side of the CANH [CAN branch wire]/CANL [CAN branch wire] of the ECU and/or sensor is open).
| Symptom | Trouble Area |
|---|---|
| 2 or more ECUs and/or sensors do not appear on the intelligent tester "Bus Check" screen. |
|
*1: w/ Entry and Start System
*2: w/o Entry and Start System
*3: for Radio and Display Type
*4: w/ Stop and Start System
*5: for 1WW (w/ Cruise Control System)
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
For vehicles with an entry and start system:
Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system (for Entry Function) Click here.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.
Tech Tips
Perform the following inspection for the ECUs (sensors) which are not displayed on the intelligent tester. If a malfunction cannot be identified, perform the following inspections for the ECUs (sensors) connected to the CAN communication system.
Do not remove the combination meter assembly and ECM, as they are the end parts of the circuit. If removed, CAN communication will not be possible.
The open circuit confirmation of the combination meter assembly, ECM and main wire is performed in the Check CAN Bus Line procedure of "How to Proceed with Troubleshooting". This inspection only has procedures for checking for an open circuit on one side of the CAN branch wire.
PROCEDURE
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (BRAKE ACTUATOR ASSEMBLY)
Disconnect the A52*1 or A54*2 brake actuator assembly (skid control ECU) connector.
*1: for 1AD-FTV, 2AD-FHV, 1WW
*2: for 1ZR-FAE, 2ZR-FAE
Select "Bus Check" on the intelligent tester Click here.
| Result | Proceed to |
|---|---|
| "Skid Control (ABS/VSC/TRAC)" not displayed on the intelligent tester. | A |
| Several ECUs and sensors in addition to "Skid Control (ABS/VSC/TRAC)" not displayed on the intelligent tester. | B |
| B |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (ENGINE STOP AND START ECU) Click here |
| A |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (BRAKE ACTUATOR ASSEMBLY CAN BRANCH WIRE)
| *A | for 1AD-FTV, 2AD-FTV, 1WW |
| *B | for 1ZR-FAE, 2ZR-FAE |
| *a | Front view of wire harness connector (to Brake Actuator Assembly) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
||||||
|
| NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (BRAKE ACTUATOR ASSEMBLY) |
| OK |
|
REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (ENGINE STOP AND START ECU)
Note
For vehicles without a stop and start system, go to "Check for Open in One Side of CAN Branch Wire (Main Body ECU)".
Disconnect the H121 engine stop and start ECU connector.
Select "Bus Check" on the intelligent tester Click here.
| Result | Proceed to |
|---|---|
| "Stop and Go/Start" not displayed on the intelligent tester. | A |
| Several ECUs and sensors in addition to "Stop and Go/Start" not displayed on the intelligent tester. | B |
| B |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU) Click here |
| A |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (ENGINE STOP AND START ECU CAN BRANCH WIRE)
| *a | Rear view of wire harness connector (to Engine Stop and Start ECU) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (ENGINE STOP AND START ECU) |
| OK |
|
REPLACE ENGINE STOP AND START ECU Click here
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU)
Disconnect the H81 main body ECU (instrument panel junction block assembly) connector.
Select "Bus Check" on the intelligent tester Click here.
| Result | Proceed to |
|---|---|
| "Main Body" not displayed on the intelligent tester. | A |
| Several ECUs and sensors in addition to "Main Body" not displayed on the intelligent tester. | B |
| B |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (YAW RATE SENSOR) Click here |
| A |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU CAN BRANCH WIRE)
| *a | Rear view of wire harness connector (to Main Body ECU [Instrument Panel Junction Block Assembly]) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (MAIN BODY ECU) |
| OK |
|
REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (YAW RATE SENSOR)
Disconnect the H68 yaw rate sensor connector.
Select "Bus Check" on the intelligent tester Click here.
| Result | Proceed to |
|---|---|
| "Yaw Rate Sensor" not displayed on the intelligent tester. | A |
| Several ECUs and sensors in addition to "Yaw Rate Sensor" not displayed on the intelligent tester. | B |
| B |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY) Click here |
| A |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (YAW RATE SENSOR CAN BRANCH WIRE)
| *a | Front view of wire harness connector (to Yaw Rate Sensor) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (YAW RATE SENSOR) |
| OK |
|
REPLACE YAW RATE SENSOR Click here
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY)
Disconnect the H69 spiral with sensor cable sub-assembly (steering angle sensor) connector.
Select "Bus Check" on the intelligent tester Click here.
| Result | Proceed to |
|---|---|
| "Spiral cable (Steering Angle Sensor)" not displayed on the intelligent tester. | A |
| Several ECUs and sensors in addition to "Spiral cable (Steering Angle Sensor)" not displayed on the intelligent tester. | B |
| B |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER STEERING ECU ASSEMBLY) Click here |
| A |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY CAN BRANCH WIRE)
| *a | Rear view of wire harness connector (to Spiral with Sensor Cable Sub-assembly) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY) |
| OK |
|
ADJUST SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY (STEERING ANGLE SENSOR) Click here
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER STEERING ECU ASSEMBLY)
Disconnect the H49 power steering ECU assembly connector.
Select "Bus Check" on the intelligent tester Click here.
| Result | Proceed to |
|---|---|
| "Power Steering (EPS)" not displayed on the intelligent tester. | A |
| Several ECUs and sensors in addition to "Power Steering (EPS)" not displayed on the intelligent tester. | B |
| B |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (RADIO AND DISPLAY RECEIVER ASSEMBLY) Click here |
| A |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER STEERING ECU ASSEMBLY CAN BRANCH WIRE)
| *a | Front view of wire harness connector (to Power Steering ECU Assembly) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (POWER STEERING ECU) |
| OK |
|
REPLACE POWER STEERING ECU ASSEMBLY Click here
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (RADIO AND DISPLAY RECEIVER ASSEMBLY)
Note
For vehicles without a radio and display receiver type, go to "Check for Open in One Side of CAN Branch Wire (Air Conditioning Amplifier Assembly)".
Disconnect the H105 radio and display receiver assembly connector.
Select "Bus Check" on the intelligent tester Click here.
| Result | Proceed to |
|---|---|
| "Display and Navigation (AVN1)" not displayed on the intelligent tester. | A |
| Several ECUs and sensors in addition to "Display and Navigation (AVN1)" not displayed on the intelligent tester. | B |
| B |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY) Click here |
| A |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (RADIO AND DISPLAY RECEIVER ASSEMBLY CAN BRANCH WIRE)
| *a | Front view of wire harness connector (to Radio and Display Receiver Assembly) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY) |
| OK |
|
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY)
Note
For vehicles with an entry and start system, go to "Check for Open in One Side of CAN Branch Wire (Certification ECU)".
Disconnect the H46*1, H9*2 or H118*3 air conditioning amplifier assembly connector.
*1: for Automatic Air Conditioning System
*2: except 1WW (for Manual Air Conditioning System or w/o Air Conditioning System)
*3: for 1WW (for Manual Air Conditioning System or w/o Air Conditioning System)
Select "Bus Check" on the intelligent tester Click here.
| Result | Proceed to |
|---|---|
| "Air Conditioning Amplifier" not displayed on the intelligent tester. | A |
| Several ECUs and sensors in addition to "Air Conditioning Amplifier" not displayed on the intelligent tester. | B |
| B |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CERTIFICATION ECU) Click here |
| A |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY CAN BRANCH WIRE)
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
| *A | for Automatic Air Conditioning System | *B | except 1WW (for Manual Air Conditioning System or w/ o Air Conditioning System) |
| *C | for 1WW (for Manual Air Conditioning System or w/o Air Conditioning System) | - | - |
| *a | Front view of wire harness connector (to Air Conditioning Amplifier Assembly) |
- | - |
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
| for Automatic Air Conditioning System | ||||||
|
||||||
| except 1WW (for Manual Air Conditioning System or w/o Air Conditioning System) | ||||||
|
||||||
| for 1WW (for Manual Air Conditioning System or w/o Air Conditioning System) | ||||||
|
| NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY) |
| OK |
|
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CERTIFICATION ECU)
Note
For vehicles without an entry and start system, go to "Check for Open in One Side of CAN Branch Wire (Driving Support ECU Assembly)".
Disconnect the H51 certification ECU (smart key ECU assembly) connector.
Select "Bus Check" on the intelligent tester Click here.
| Result | Proceed to |
|---|---|
| "Certification (Smart)" not displayed on the intelligent tester. | A |
| Several ECUs and sensors in addition to "Certification (Smart)" not displayed on the intelligent tester. | B |
| B |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (DRIVING SUPPORT ECU ASSEMBLY) Click here |
| A |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CERTIFICATION ECU CAN BRANCH WIRE)
| *a | Rear view of wire harness connector (to Certification ECU [Smart Key ECU Assembly]) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CERTIFICATION ECU) |
| OK |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (DRIVING SUPPORT ECU ASSEMBLY)
Note
For vehicles without a 1WW engine type and cruise control system, go to "Check for Open in One Side of CAN Branch Wire (Power Management Control ECU)".
Disconnect the H124 driving support ECU assembly connector.
Select "Bus Check" on the intelligent tester Click here.
| Result | Proceed to |
|---|---|
| "Driving Support (Cruise Control-ACC)" not displayed on the intelligent tester. | A |
| Several ECUs and sensors in addition to "Driving Support (Cruise Control-ACC)" not displayed on the intelligent tester. | B |
| B |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER MANAGEMENT CONTROL ECU) Click here |
| A |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (DRIVING SUPPORT ECU ASSEMBLY CAN BRANCH WIRE)
| *a | Rear view of wire harness connector (to Driving Support ECU) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| Result | Proceed to |
|---|---|
| OK (for LHD) | A |
| OK (for RHD) | B |
| NG | C |
| B |
|
REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here |
| C |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY) |
| A |
|
REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER MANAGEMENT CONTROL ECU)
Disconnect the H71 power management control ECU connector.
Select "Bus Check" on the intelligent tester Click here.
| Result | Proceed to |
|---|---|
| "Power Management1" not displayed on the intelligent tester. | A |
| Several ECUs and sensors in addition to "Power Management1" not displayed on the intelligent tester. | B |
| B |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR ASSEMBLY CAN BRANCH WIRE) Click here |
| A |
|
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER MANAGEMENT CONTROL ECU CAN BRANCH WIRE)
| *a | Rear view of wire harness connector (to Power Management Control ECU) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| Result | Proceed to |
|---|---|
| OK (for LHD) | A |
| OK (for RHD) | B |
| NG | C |
| B |
|
REPLACE POWER MANAGEMENT CONTROL ECU Click here |
| C |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU) |
| A |
|
REPLACE POWER MANAGEMENT CONTROL ECU Click here
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR ASSEMBLY CAN BRANCH WIRE)
| *a | Front view of wire harness connector (to Center Airbag Sensor Assembly) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.
Disconnect the center airbag sensor assembly connector Click here.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| NG |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CENTER AIRBAG SENSOR ASSEMBLY) |
| OK |
|
REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here