U1002

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1002: Lost Communication with Gateway Module
U1002 - Lost Communication with Gateway Module

DESCRIPTION

If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open. (One side of the CANH [branch wire]/CANL [branch wire] of the ECU and/or sensor is open.)





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Operating the ignition switch, any other switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.

NEXT -- Continue to next step.

2. CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT)

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





Standard resistance:





Result





C -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)

B -- CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - FRONT POWER SEAT CONTROL ECU AND SWITCH LH)
A -- Continue to next step.

3. CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)

(a) Disconnect the J114 No. 3 junction connector.





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

Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

4. CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ECU)

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





Standard resistance:





NG -- CONNECT CONNECTOR

OK -- REPLACE NO. 3 JUNCTION CONNECTOR

5. CONNECT CONNECTOR

(a) Reconnect the J114 No. 3 junction connector.

NEXT -- Continue to next step.

6. CHECK FOR OPEN IN CAN BUS WIRE (COMBINATION METER ECU - NO. 3 JUNCTION CONNECTOR)

(a) Disconnect the J28 combination meter ECU connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ECU (COMBINATION METER ECU - NO. 3 JUNCTION CONNECTOR)

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

7. CONNECT CONNECTOR

(a) Reconnect the J114 No. 3 junction connector.

NEXT -- Continue to next step.

8. CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU - NO. 3 JUNCTION CONNECTOR)

(a) Disconnect the J2 main body ECU connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MAIN BODY ECU (MAIN BODY ECU - NO. 3 JUNCTION CONNECTOR)

OK -- REPLACE MAIN BODY ECU

9. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - FRONT POWER SEAT CONTROL ECU AND SWITCH LH)

(a) Disconnect the J114 No. 3 junction connector.





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

Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

10. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - MULTIPLEX TILT AND TELESCOPIC ECU)

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





Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

11. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - OUTER MIRROR CONTROL ECU)

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





Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

12. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ECU)

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





Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

13. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)

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





Standard resistance:





NG -- CONNECT CONNECTOR

OK -- REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR

14. CONNECT CONNECTOR

(a) Reconnect the J114 No. 3 junction connector.

NEXT -- Continue to next step.

15. CHECK FOR SHORT IN CAN BUS WIRES (FRONT POWER SEAT CONTROL ECU AND SWITCH LH)

(a) Disconnect the Z10 front power seat control ECU and switch LH connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO FRONT POWER SEAT CONTROL ECU AND SWITCH LH (CANH, CANL)

OK -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Disassembly

16. CONNECT CONNECTOR

(a) Reconnect the J114 No. 3 junction connector.

NEXT -- Continue to next step.

17. CHECK FOR SHORT IN CAN BUS WIRES (MULTIPLEX TILT AND TELESCOPIC ECU)

(a) Disconnect the J47 multiplex tilt and telescopic ECU connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MULTIPLEX TILT AND TELESCOPIC ECU (CANH, CANL)

OK -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Disassembly

18. CONNECT CONNECTOR

(a) Reconnect the J114 No. 3 junction connector.

NEXT -- Continue to next step.

19. CHECK FOR SHORT IN CAN BUS WIRES (OUTER MIRROR CONTROL ECU)

(a) Disconnect the N8 outer mirror control ECU connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO OUTER MIRROR CONTROL ECU (CAN, CGND)

OK -- REPLACE OUTER MIRROR CONTROL ECU Disassembly

20. CONNECT CONNECTOR

(a) Reconnect the J114 No. 3 junction connector.

NEXT -- Continue to next step.

21. CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ECU)

(a) Disconnect the J28 combination meter ECU connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ECU (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ECU)

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

22. CONNECT CONNECTOR

(a) Reconnect the J114 No. 3 junction connector.

NEXT -- Continue to next step.

23. CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)

(a) Disconnect the J2 main body ECU connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MAIN BODY ECU (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)

OK -- REPLACE MAIN BODY ECU

24. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)

(a) Reconnect the cable to the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.





(b) Disconnect the DA, DB and DD main body ECU connectors.

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

Standard resistance:





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU