Part 1

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.)





HINT
*1: w/ Front Power Seat Control System (w/ Memory)

*2: w/ Rear Power Seat Control System (except 4-Passenger with Ottoman) or w/ Seat Heater System

*3: w/ Rear Power Seat Control System (for 4-Passenger with Ottoman)

*4: w/ Dynamic Radar Cruise Control System, w/ Pre-collision System or w/ Lane Keeping Assist System

*5: w/ Power Trunk Lid 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 prevent airbag and seat belt pretensioner activation.

NOTICE:
* w/ Navigation System (for HDD):
After the engine switch is turned off, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the engine switch off, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal:





* When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

NEXT -- Continue to next step.

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

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





Standard resistance:





Result





B -- CHECK FOR SHORT IN CAN BUS WIRES (NO. 12 JUNCTION CONNECTOR SIDE)

C -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)
A -- Continue to next step.

3. CHECK FOR OPEN IN CAN MAIN BUS WIRE (NO. 10 JUNCTION CONNECTOR - FRONT CONTROLLER)

(a) Disconnect the L95 No. 10 junction connector 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 MAIN WIRE (NO. 10 JUNCTION CONNECTOR - REAR JUNCTION BLOCK ECU)

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





Standard resistance:





NG -- CONNECT CONNECTOR

OK -- REPLACE NO. 10 JUNCTION CONNECTOR

5. CONNECT CONNECTOR

(a) Reconnect the L95 No. 10 junction connector connector.

NEXT -- Continue to next step.

6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 9 JUNCTION CONNECTOR - FRONT CONTROLLER)

(a) Disconnect the R48 No. 9 junction connector connector.





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

Standard resistance:





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

7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 9 JUNCTION CONNECTOR - NO. 10 JUNCTION CONNECTOR)

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





Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 9 JUNCTION CONNECTOR - NO. 10 JUNCTION CONNECTOR)

OK -- REPLACE NO. 9 JUNCTION CONNECTOR

8. CONNECT CONNECTOR

(a) Reconnect the R48 No. 9 junction connector connector.

NEXT -- Continue to next step.

9. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 8 JUNCTION CONNECTOR - FRONT CONTROLLER)

(a) Disconnect the R57 No. 8 junction connector 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 OPEN IN CAN BUS MAIN WIRE (NO. 8 JUNCTION CONNECTOR - NO. 9 JUNCTION CONNECTOR)

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





Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 8 JUNCTION CONNECTOR - NO. 9 JUNCTION CONNECTOR)

OK -- REPLACE NO. 8 JUNCTION CONNECTOR

11. CONNECT CONNECTOR

(a) Reconnect the R57 No. 8 junction connector connector.

NEXT -- Continue to next step.

12. CHECK FOR OPEN IN CAN BUS MAIN WIRE (FRONT CONTROLLER - NO. 8 JUNCTION CONNECTOR)

(a) Disconnect the A50 front controller 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 FRONT CONTROLLER (FRONT CONTROLLER - NO. 8 JUNCTION CONNECTOR)

OK -- REPLACE FRONT CONTROLLER

13. CONNECT CONNECTOR

(a) Reconnect the L95 No. 10 junction connector connector.

NEXT -- Continue to next step.

14. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 10 JUNCTION CONNECTOR - NO. 12 JUNCTION CONNECTOR)

(a) Disconnect the S59 No. 12 junction connector connector.





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

Standard resistance:





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

15. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 12 JUNCTION CONNECTOR - REAR JUNCTION BLOCK ECU)

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





Standard resistance:





NG -- CONNECT CONNECTOR

OK -- REPLACE NO. 12 JUNCTION CONNECTOR

16. CONNECT CONNECTOR

(a) Reconnect the S59 No. 12 junction connector connector.

NEXT -- Continue to next step.

17. CHECK FOR OPEN IN CAN BUS MAIN WIRE (REAR JUNCTION BLOCK ECU - NO. 12 JUNCTION CONNECTOR)

(a) Disconnect the S62 rear junction block 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 REAR JUNCTION BLOCK ECU (REAR JUNCTION BLOCK ECU - NO. 12 JUNCTION CONNECTOR)

OK -- REPLACE REAR JUNCTION BLOCK ECU

18. CONNECT CONNECTOR

(a) Reconnect the S59 No. 12 junction connector connector.

NEXT -- Continue to next step.

19. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 10 JUNCTION CONNECTOR - NO. 11 JUNCTION CONNECTOR)

(a) Disconnect the S60 No. 11 junction connector connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 10 JUNCTION CONNECTOR - NO. 11 JUNCTION CONNECTOR)
OK -- Continue to next step.

20. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 11 JUNCTION CONNECTOR - NO. 12 JUNCTION CONNECTOR)

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





Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 11 JUNCTION CONNECTOR - NO. 12 JUNCTION CONNECTOR)

OK -- REPLACE NO. 11 JUNCTION CONNECTOR

21. CHECK FOR SHORT IN CAN BUS WIRES (NO. 12 JUNCTION CONNECTOR SIDE)

(a) Disconnect the S59 No. 12 junction connector connector.





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

Standard resistance:





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

22. CHECK FOR SHORT IN CAN BUS WIRES (NO. 12 JUNCTION CONNECTOR - REAR POWER SEAT MODULE SWITCH)

NOTICE:
For vehicles without rear power seat control system (except 4-passenger with ottoman) or seat heater system and rear power seat control system (for 4-passenger with ottoman), go to "CHECK FOR SHORT IN CAN BUS WIRES (NO. 12 JUNCTION CONNECTOR - POWER TRUNK LID CONTROL ECU)".

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





Result





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

23. CHECK FOR SHORT IN CAN BUS WIRES (NO. 12 JUNCTION CONNECTOR - POWER TRUNK LID CONTROL ECU)

NOTICE:
For vehicles without power trunk lid system, go to "CHECK FOR SHORT IN CAN BUS WIRES (NO. 12 JUNCTION CONNECTOR - REAR JUNCTION BLOCK ECU)".

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





Result





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

24. CHECK FOR SHORT IN CAN BUS WIRES (NO. 12 JUNCTION CONNECTOR - REAR JUNCTION BLOCK ECU)

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





Result





NG -- CONNECT CONNECTOR

OK -- REPAIR OR REPLACE NO. 12 JUNCTION CONNECTOR

25. CONNECT CONNECTOR

(a) Reconnect the S59 No. 12 junction connector connector.

NEXT -- Continue to next step.

26. CHECK FOR SHORT IN CAN BUS WIRES (REAR POWER SEAT MODULE SWITCH)

(a) for 4-passenger with Ottoman:

(1) Disconnect the S15 rear power seat module switch connector.





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

Result





(b) except 4-passenger with Ottoman:

(1) Disconnect the r2 rear power seat module switch connector.





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

Result





B -- REPLACE REAR POWER SEAT MODULE SWITCH Disassembly

C -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO REAR POWER SEAT MODULE SWITCH (CANP, CANN)

A -- REPLACE REAR POWER SEAT MODULE SWITCH Removal

27. CONNECT CONNECTOR

(a) Reconnect the S59 No. 12 junction connector connector.

NEXT -- Continue to next step.

28. CHECK FOR SHORT IN CAN BUS WIRES (POWER TRUNK LID CONTROL ECU)

(a) Disconnect the S43 power trunk lid control ECU connector.





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

Result





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POWER TRUNK LID CONTROL ECU (CANH, CANL)

OK -- REPLACE POWER TRUNK LID CONTROL ECU Removal

29. CONNECT CONNECTOR

(a) Reconnect the S59 No. 12 junction connector connector.

NEXT -- Continue to next step.

30. CHECK FOR SHORT IN CAN BUS WIRES (REAR JUNCTION BLOCK ECU)

(a) Disconnect the S62 rear junction block ECU connector.





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

Result





NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO REAR JUNCTION BLOCK ECU (NO. 8 JUNCTION CONNECTOR - REAR JUNCTION BLOCK ECU)

OK -- REPLACE REAR JUNCTION BLOCK ECU

31. CONNECT CONNECTOR

(a) Reconnect the S59 No. 12 junction connector connector.

NEXT -- Continue to next step.

32. CHECK FOR SHORT IN CAN BUS WIRES (NO. 12 JUNCTION CONNECTOR - NO. 11 JUNCTION CONNECTOR)

(a) Disconnect the S60 No. 11 junction connector connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 12 JUNCTION CONNECTOR - NO. 11 JUNCTION CONNECTOR)
OK -- Continue to next step.

33. CHECK FOR SHORT IN CAN BUS WIRES (NO. 11 JUNCTION CONNECTOR SIDE)

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





Standard resistance:





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

34. CHECK FOR SHORT IN CAN BUS WIRES (NO. 11 JUNCTION CONNECTOR - DRIVING SUPPORT ECU)

NOTICE:
For vehicles without dynamic radar cruise control system, without pre-collision system or without lane keeping assist system, go to "CHECK FOR SHORT IN CAN BUS WIRES (NO. 11 JUNCTION CONNECTOR - FRONT POWER SEAT ECU AND SWITCH LH)".

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





Result





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

35. CHECK FOR SHORT IN CAN BUS WIRES (NO. 11 JUNCTION CONNECTOR - FRONT POWER SEAT ECU AND SWITCH LH)

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





Result





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

36. CHECK FOR SHORT IN CAN BUS WIRES (NO. 11 JUNCTION CONNECTOR - FRONT POWER SEAT ECU AND SWITCH LH)

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





Result





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

37. CHECK FOR SHORT IN CAN BUS WIRES (NO. 11 JUNCTION CONNECTOR - REAR MULTIPLEX NETWORK DOOR ECU LH)

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





Result





NG -- CONNECT CONNECTOR

OK -- REPAIR OR REPLACE NO. 11 JUNCTION CONNECTOR

38. CONNECT CONNECTOR

(a) Reconnect the S60 No. 11 junction connector connector.

NEXT -- Continue to next step.

39. CHECK FOR SHORT IN CAN BUS WIRES (DRIVING SUPPORT ECU)

(a) Disconnect the A33 driving support ECU connector.





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