Component Tests and General Diagnostics

IMA System Indicator Circuit Troubleshooting

NOTE:

- If the IMA system indicator stays on or never comes on, do this troubleshooting (if no DTCs are set).
- Information marked with an asterisk (*) applies to the '06-07 models.

1. Turn the ignition switch to ON (II), and watch the IMA system indicator.

Does the IMA system indicator come on?

YES -

Go to step 2.

NO -

Go to step 5.

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

3. Turn the ignition switch to ON (II), wait 2 seconds, and watch the IMA system indicator.

Does the IMA system indicator come on and stay on?

YES -

Go to step 4.

NO -

The IMA system indicator circuit is OK.�

4. Check for Pending or Confirmed DTCs with the HDS.

Are any Pending or Confirmed DTCs indicated?

YES -

Go to the indicated DTC's troubleshooting.

NO -

Go to step 5.

5. Do the gauge self-diagnostic function Initial Inspection and Diagnostic Overview.

Does the IMA system indicator flash?

YES -

Go to step 6.

NO -

Substitute a known-good gauge control module, and recheck. If the IMA system indicator circuit is OK, replace the original gauge control module Gauge Control Module Replacement.�

6. Check the 12 V battery terminal connections.

Are the connections OK?

YES -

Go to step 7.

NO -

Repair the connections, or replace the 12 V battery.�

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

8. Turn the battery module switch OFF High Voltage Safety.

9. Remove the IPU lid IPU Lid Removal/Installation.

10. Disconnect BCM module connector A (40P).

11. Turn the ignition switch to ON (II).

12. Measure the voltage between body ground and BCM module connector terminal A29.

Is there 12 V battery voltage?

YES -

Go to step 13.

NO -

- Repair open or short in the wire between the No. 10 METER (7.5 A) fuse in the under-dash fuse/relay box and the BCM module (A29).
- Check the No. 10 METER (7.5 A) fuse. If needed, replace it.�

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

14. Reconnect BCM module connector A (40P).

15. Turn the ignition switch to ON (II).

16. Measure the voltage between body ground and BCM module connector terminals A2* and A3.

Is there 12 V battery voltage?

YES -

Go to step 17.

NO -

Go to step 20.

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

18. Disconnect BCM module connector A (40P).

19. Check for continuity between body ground and BCM module connector terminals A8*, A9, A22*, and A23 individually.

Is there continuity?

YES -

Update the BCM module if it does not have the latest software Testing and Inspection, or substitute a known-good BCM module Initial Inspection and Diagnostic Overview, then recheck. If the symptom/indication goes away with a known-good BCM module, replace the original BCM module Service and Repair.�

NO -

Repair open in the wire between G902 and the BCM module (A8*, A9), or between G102 and the BCM module (A22*, A23).�

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

21. Remove MCM relay 1 (A).

22. Test MCM relay 1 Testing and Inspection.

Is the relay OK?

YES -

Go to step 23.

NO -

Replace MCM relay 1.�

23. Measure the voltage between body ground and MCM relay 1 4P connector terminals No. 2 and No. 4 individually.

Is there 12 V battery voltage?

YES -

Go to step 24.

NO -

- Repair open or short to ground in the wire between the No. 62 +B IMA (7.5 A) and MCM relay 1.�
- Check the No. 62 +B IMA (7.5 A) fuse. If needed, replace it.�
- Repair short to ground in the wire between MCM relay 1, MCM relay 2, and the BCM module (A2*,A3, A11).�

24. Reinstall MCM relay 1.

25. Disconnect BCM module connector A (40P).

26. Turn the ignition switch to ON (II).

27. Measure the voltage between body ground and BCM module connector terminal A11.

Is there 12 V battery voltage?

YES -

Go to step 28.

NO -

Repair open in the wire between MCM relay 1 and the BCM module (A11).�

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

29. Check for continuity between BCM module connector terminal A2* and A3 and MCM relay 1 4P connector terminal No. 1.