U0200

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DTC Code	DTC Name
U0200	Lost Communication with "Door Control Module B"

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DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
U0200	Lost Communication with "Door Control Module B"	No communication from the outer mirror control ECU assembly (for driver side) continues. (for LHD) No communication from the outer mirror control ECU assembly (for front passenger side) continues. (for RHD)	Outer mirror control ECU assembly (for driver side) branch line or connector (for LHD) Power source circuit of outer mirror control ECU assembly (for driver side) (for LHD) Outer mirror control ECU assembly (for driver side) ground circuit (for LHD) Outer mirror control ECU assembly (for driver side) (for LHD) Outer mirror control ECU assembly (for front passenger side) branch line or connector (for RHD) Power source circuit of outer mirror control ECU assembly (for front passenger side) (for RHD) Outer mirror control ECU assembly (for front passenger side) ground circuit (for RHD) Outer mirror control ECU assembly (for front passenger side) (for RHD)	Tip: The main body ECU (multiplex network body ECU) stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 1.

Tip:

This diagnostic procedure is for when DTC U0200 is output by the main body ECU (multiplex network body ECU) (GTS display: Main Body).

Figure 2. for RHD: B0066Q1E97

Figure 1. for LHD:

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Note:

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

DTC check procedure: Turn the engine switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

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Inspect the fuses for circuits related to this system before performing the following procedure.

Tip:

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

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PROCEDURE

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RECONFIRM DTC OUTPUT

Reconfirm DTCs.

Body Electrical > Main Body > Trouble Codes

Tip:

If DTC U1002 is output from Main Body of the main body ECU (multiplex network body ECU), this indicates a sub bus 1 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 1.

Result

Result	Proceed to
DTC U1002 is not output from the main body ECU (multiplex network body ECU) (GTS display: Main Body)	A
DTC U1002 is output from the main body ECU (multiplex network body ECU) (GTS display: Main Body)	B

AClick here
B
GO TO DIAGNOSTIC PROCEDURE INDICATED BY OUTPUT DTCClick here

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CHECK VEHICLE TYPE

Check vehicle type.

Result

Result	Proceed to
for LHD	A
for RHD	B

AClick here
BClick here

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CHECK FOR OPEN IN SUB BUS 1 LINES (OUTER MIRROR CONTROL ECU ASSEMBLY (FOR DRIVER SIDE) BRANCH LINE)

Disconnect the cable from the negative (-) battery terminal.
*a
Front view of wire harness connector

(to Outer Mirror Control ECU Assembly (for Driver Side))

Disconnect the S12 outer mirror control ECU assembly (for driver side) connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
S12-9 (CANP) - S12-8 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

Result

Result
OK
NG

OKClick here
NG
REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY (FOR DRIVER SIDE))

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CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

*a	Front view of wire harness connector (to Outer Mirror Control ECU Assembly (for Driver Side))

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
S12-7 (GND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

Reconnect the cable to the negative (-) battery terminal.

*a	Front view of wire harness connector (to Outer Mirror Control ECU Assembly (for Driver Side))

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
S12-5 (SIG) - Body ground	Engine switch on (IG)	11 to 14 V
S12-6 (CPUB) - Body ground	Always	11 to 14 V
S12-14 (BDR) - Body ground	Always	11 to 14 V

Result

Result
OK
NG

OK
REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FOR DRIVER SIDE)Click here
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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CHECK FOR OPEN IN SUB BUS 1 LINES (OUTER MIRROR CONTROL ECU ASSEMBLY (FOR FRONT PASSENGER SIDE) BRANCH LINE)

Disconnect the cable from the negative (-) battery terminal.

*a	Front view of wire harness connector (to Outer Mirror Control ECU Assembly (for Front Passenger Side))

Disconnect the S12 outer mirror control ECU assembly (for front passenger side) connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
S12-9 (CANP) - S12-8 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

Result

Result
OK
NG

OKClick here
NG
REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY (FOR FRONT PASSENGER SIDE))

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CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

*a	Front view of wire harness connector (to Outer Mirror Control ECU Assembly (for Front Passenger Side))

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
S12-7 (GND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

Reconnect the cable to the negative (-) battery terminal.

*a	Front view of wire harness connector (to Outer Mirror Control ECU Assembly (for Front Passenger Side))

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
S12-5 (SIG) - Body ground	Engine switch on (IG)	11 to 14 V
S12-6 (CPUB) - Body ground	Always	11 to 14 V
S12-14 (BDR) - Body ground	Always	11 to 14 V

Result

Result
OK
NG

OK
REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (FOR FRONT PASSENGER SIDE)Click here
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0200