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 Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or 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.
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 (Intelligent Power Unit) 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.
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 MCM relay 1 and the BCM module (A2*, A3).
