U1002
CAN COMMUNICATION: 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.)
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.
NOTE: After the ignition switch is turned OFF, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch OFF, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.
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:
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 J97 No. 3 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. CONNECT CONNECTOR
(a) Reconnect the J97 No. 3 junction connector connector.
NEXT -- Continue to next step.
5. CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ECU)
(a) Disconnect the J95 No. 3 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- CONNECT CONNECTOR
OK -- REPLACE NO. 3 JUNCTION CONNECTOR
6. CONNECT CONNECTOR
(a) Reconnect the J95 No. 3 junction connector connector.
NEXT -- Continue to next step.
7. 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
8. CONNECT CONNECTOR
(a) Reconnect the J97 No. 3 junction connector connector.
NEXT -- Continue to next step.
9. 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
10. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - FRONT POWER SEAT CONTROL ECU AND SWITCH LH)
(a) Disconnect the J90 No. 3 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Result
NG -- CONNECT CONNECTOR
OK -- Continue to next step.
11. CONNECT CONNECTOR
(a) Reconnect the J90 No. 3 junction connector connector.
NEXT -- Continue to next step.
12. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - MULTIPLEX TILT AND TELESCOPIC ECU)
(a) Disconnect the J89 No. 3 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Result
NG -- CONNECT CONNECTOR
OK -- Continue to next step.
13. CONNECT CONNECTOR
(a) Reconnect the J89 No. 3 junction connector connector.
NEXT -- Continue to next step.
14. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - OUTER MIRROR CONTROL ECU)
(a) Disconnect the J91 No. 3 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Result
NG -- CONNECT CONNECTOR
OK -- Continue to next step.
15. CONNECT CONNECTOR
(a) Reconnect the J91 No. 3 junction connector connector.
NEXT -- Continue to next step.
16. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ECU)
(a) Disconnect the J95 No. 3 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Result
NG -- CONNECT CONNECTOR
OK -- Continue to next step.
17. CONNECT CONNECTOR
(a) Reconnect the J95 No. 3 junction connector connector.
NEXT -- Continue to next step.
18. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)
(a) Disconnect the J97 No. 3 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Result
NG -- CONNECT CONNECTOR
OK -- REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR
19. CONNECT CONNECTOR
(a) Reconnect the J90 No. 3 junction connector connector.
NEXT -- Continue to next step.
20. 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.
Result
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
21. CONNECT CONNECTOR
(a) Reconnect the J89 No. 3 junction connector connector.
NEXT -- Continue to next step.
22. 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.
Result
NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MULTIPLEX TILT AND TELESCOPIC ECU (CANH, CANL)
OK -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU
23. CONNECT CONNECTOR
(a) Reconnect the J91 No. 3 junction connector connector.
NEXT -- Continue to next step.
24. 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.
Result
NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO OUTER MIRROR CONTROL ECU (CAN, CGND)
OK -- REPLACE OUTER MIRROR CONTROL ECU
25. CONNECT CONNECTOR
(a) Reconnect the J95 No. 3 junction connector connector.
NEXT -- Continue to next step.
26. 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.
Result
NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ECU (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ECU)
OK -- REPLACE COMBINATION METER ASSEMBLY
27. CONNECT CONNECTOR
(a) Reconnect the J97 No. 3 junction connector connector.
NEXT -- Continue to next step.
28. 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.
Result
NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MAIN BODY ECU (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)
OK -- REPLACE MAIN BODY ECU
29. 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