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U1002








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

DTC 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.)





HINT: *1: w/ Power back door system

WIRING DIAGRAM





INSPECTION PROCEDURE

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 disable the SRS system.

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:





D -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)
C -- CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - POWER SEAT CONTROL ECU)
B -- CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR SIDE)
A -- Continue to next step.

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





(a) with Power back door system:
(1) Disconnect the H104 No. 3 junction connector.
(2) Measure the resistance according to the value(s) in the table below.

Standard Resistance:









(b) without Power back door system:
(1) Disconnect the H104 No. 3 junction connector.
(2) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





C -- CONNECT CONNECTOR
B -- CONNECT CONNECTOR
A -- Continue to next step.

4. CONNECT CONNECTOR
(a) Reconnect the H104 No. 3 junction connector.
NEXT -- Continue to next step.

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





(a) Disconnect the H102 No. 3 junction connector.
(b) 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
6. CONNECT CONNECTOR
(a) Reconnect the H102 No. 3 junction connector.
NEXT -- Continue to next step.

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





(a) Disconnect the H102 No. 3 junction 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
8. CONNECT CONNECTOR
(a) Reconnect the H104 No. 3 junction connector.
NEXT -- Continue to next step.

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





(a) Disconnect the H2 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
10. CONNECT CONNECTOR
(a) Reconnect the H104 No. 3 junction connector.
NEXT -- Continue to next step.

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





(a) Disconnect the O41 No. 4 junction connector.
(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)
OK -- Continue to next step.

12. CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 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. 4 JUNCTION CONNECTOR
13. CONNECT CONNECTOR
(a) Reconnect the O41 No. 4 junction connector.
NEXT -- Continue to next step.

14. CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU - NO. 4 JUNCTION CONNECTOR)





(a) Disconnect the H2 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. 4 JUNCTION CONNECTOR)
OK -- REPLACE MAIN BODY ECU
15. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR SIDE)




(a) Disconnect the H104 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.

16. CONNECT CONNECTOR
(a) Reconnect the H104 No. 3 junction connector.
NEXT -- Continue to next step.

17. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)





(a) Disconnect the O41 No. 4 junction connector.
(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)
OK -- Continue to next step.

18. CONNECT CONNECTOR
(a) Reconnect the O41 No. 4 junction connector.
NEXT -- Continue to next step.

19. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - POWER BACK DOOR ECU)





(a) Disconnect the O42 No. 4 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.

20. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - MAIN BODY ECU)




(a) Disconnect the O41 No. 4 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- CONNECT CONNECTOR
OK -- REPAIR OR REPLACE NO. 4 JUNCTION CONNECTOR
21. CONNECT CONNECTOR
(a) Reconnect the O42 No. 4 junction connector.
NEXT -- Continue to next step.

22. CHECK FOR SHORT IN CAN BUS WIRES (POWER BACK DOOR ECU)




(a) Disconnect the O30 power back door 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 POWER BACK DOOR ECU (NO. 4 JUNCTION CONNECTOR - POWER BACK DOOR ECU)
OK -- REPLACE POWER BACK DOOR UNIT ASSEMBLY
23. CONNECT CONNECTOR
(a) Reconnect the O42 No. 4 junction connector.
NEXT -- Continue to next step.

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




(a) Disconnect the H2 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. 4 JUNCTION CONNECTOR - MAIN BODY ECU)
OK -- REPLACE MAIN BODY ECU
25. CONNECT CONNECTOR
(a) Reconnect the H104 No. 3 junction connector.
NEXT -- Continue to next step.

26. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - POWER SEAT CONTROL ECU)




(a) Disconnect the H97 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.

27. CONNECT CONNECTOR
(a) Reconnect the H97 No. 3 junction connector.
NEXT -- Continue to next step.

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




(a) Disconnect the H96 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.

29. CONNECT CONNECTOR
(a) Reconnect the H96 No. 3 junction connector.
NEXT -- Continue to next step.

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




(a) Disconnect the H98 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.

31. CONNECT CONNECTOR
(a) Reconnect the H98 No. 3 junction connector.
NEXT -- Continue to next step.

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




(a) Disconnect the H102 No. 3 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Result





C -- REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR
B -- CONNECT CONNECTOR
A -- Continue to next step.

33. CONNECT CONNECTOR
(a) Reconnect the H102 No. 3 junction connector.
NEXT -- Continue to next step.

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




(a) Disconnect the H104 No. 3 junction connector.
(b) 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
35. CONNECT CONNECTOR
(a) Reconnect the H97 No. 3 junction connector.
NEXT -- Continue to next step.

36. CHECK FOR SHORT IN CAN BUS WIRES (POWER SEAT CONTROL ECU)




(a) Disconnect the X11 power seat 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 POWER SEAT CONTROL ECU (NO. 3 JUNCTION CONNECTOR - POWER SEAT CONTROL ECU)
OK -- REPLACE FRONT POWER SEAT SWITCH LH
37. CONNECT CONNECTOR
(a) Reconnect the H96 No. 3 junction connector.
NEXT -- Continue to next step.

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




(a) Disconnect the H57 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 (NO. 3 JUNCTION CONNECTOR - MULTIPLEX TILT AND TELESCOPIC ECU)
OK -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU
39. CONNECT CONNECTOR
(a) Reconnect the H98 No. 3 junction connector.
NEXT -- Continue to next step.

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




(a) Disconnect the M8 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 (NO. 3 JUNCTION CONNECTOR - OUTER MIRROR CONTROL ECU)
OK -- REPLACE OUTER MIRROR CONTROL ECU
41. CONNECT CONNECTOR
(a) Reconnect the H102 No. 3 junction connector.
NEXT -- Continue to next step.

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




(a) Disconnect the H37 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
43. CONNECT CONNECTOR
(a) Reconnect the H104 No. 3 junction connector.
NEXT -- Continue to next step.

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





(a) Disconnect the H2 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
45. 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
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