Safety Indicator System (MICU, Gauge Control Module, And MICU-Rear Junction Box) Input Test

Safety Indicator System (MICU, Gauge Control Module, and MICU-Rear Junction Box) Input Test

NOTE: Before troubleshooting the safety indicator system, troubleshoot the multiplex integrated control system first using B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

Multiplex Integrated Control Unit

1. Turn the ignition switch to LOCK (0).

2. Remove the left kick panel Service and Repair.

3. Disconnect driver's under-dash fuse/relay box connectors E and H Driver's Under-dash Fuse/Relay Box Connector Locations.






4. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals look OK, go to step 5.

5. Reconnect the connectors to the driver's under-dash fuse/relay box. Turn the ignition switch to ON (II) and do these input tests at the connectors on the driver's under-dash fuse/relay box.

- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 6.










Gauge Control Module

6. Turn the ignition switch to LOCK (0).

7. Remove the gauge control module Service and Repair.

8. Disconnect gauge control module connector A (30P).





9. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals look OK, go to step 10.

10. Reconnect the connector to the gauge control module, turn the ignition switch to ON (II) and, do these input tests at the connector.

- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 11.






MICU-Rear Junction Box

11. Remove the right rear side trim Interior Trim Removal/Installation - Rear Side Area.

12. Disconnect MICU-rear junction box connector F (13P).





13. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals look OK, go to step 14.

14. Reconnect the connector to the MICU-rear junction box. Turn the ignition switch to ON (II) and do these input tests at the connector on the MICU-rear junction box.

- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 15.









15. If all the input tests prove OK, and no DTCs were found during multiplex integrated control system troubleshooting (B-CAN System Diagnostic Test Mode A), go to the B-CAN system input and output index Description and Operation. If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the MICU). If input failures are related to particular control unit, replace the control unit.