Integrated Motor Assist
DTC U1205 (75): IMA-CAN Malfunction (BCM Module-MCM)NOTE:
- Before you troubleshoot, record all freeze data, and review the general troubleshooting information.
- If DTC U1205 (75) is stored at the same time as DTC U0110 (101) and U0028 (108), the MCM relay is OFF forcibly.
- Information marked with an asterisk (*) applies to the '06-07 models
1. Turn the ignition switch ON (II).
2. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0037 (99) indicated?
YES - Do the troubleshooting for DTC U0037 (99).
NO - Go to step 3.
3. Clear the DTC with the HDS.
4. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U1205 (75) indicated?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the PCM, the BCM module, the A/C compressor driver, and the MCM.
5. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0110 (101) indicated?
YES - Go to step 12.
NO - Go to step 6.
6. Turn the ignition switch OFF.
7. Turn the battery module switch OFF.
8. Remove the IPU lid.
9. Remove the BCM module.
10. Disconnect the MCM 20P connector.
11. Check for continuity between BCM module connector terminal A20 and MCM 20P connector terminal No. 11, and between BCM module connector terminal A40 and MCM 20P connector terminal No. 1.
Is there continuity?
YES - Go to step 40.
NO - Repair open in the wire between the BCM module (A20, A401 and the MCM (No. 1, No. 11), then go to step 27.
12. Turn the ignition switch OFF.
13. Turn the battery module switch OFF.
14. Remove the IPU lid.
15. Check the MCM 20P connector.
Is the connection OK?
YES - Go to step 16.
NO - Repair the connection, then go to step 27.
16. Remove the BCM module, and disconnect the MCM 20P connector.
17. Reconnect BCM module connector A (40P), then turn the ignition switch ON (II) then measure voltage between MCM 20P connector terminals No. 18, No. 19, and body ground within 1 second.
Is there 72 V battery voltage?
YES - Go to step 18.
NO - Go to step 20.
18. Turn the ignition switch OFF.
19. Check for continuity between body ground and MCM 20P connector terminals No. 2 and No. 9 individually.
Is there continuity?
YES - Go to step 40.
NO - Repair open in the wire between the MCM (No. 2, No. 9) and G102, then go to step 27.
20. Check MCM relay 2.
Is the relay OK?
YES - Go to step 21.
NO - Replace MCM relay 2, then go to step 27.
21. Check the No. 61 +B IMA2 (10 A) fuse.
Is the fuse OK?
YES - Go to step 22.
NO -
- Replace the No. 61 + IMA2 (10 A) fuse, then go to step 27.
- Repair short to ground in the wire between the No. 61 + IMA2 (10 A) fuse and MCM relay 2, then go to step 27.
22. Measure voltage between MCM relay 2 4P connector terminal No. 2 and body ground.
Is there 12 V battery voltage?
YES - Go to step 23.
NO - Repair open in the wire between MCM relay 2 and the No. 61 +B IMA2 (10 A) fuse, then go to step 27.
23. Check for continuity between MCM 20P connector terminals No. 18 and No. 19. and MCM relay 2 4P connector terminal No. 1.
Is there continuity?
YES - Go to step 24.
NO - Repair open in the wire between MCM relay 2 and the MCM (No. 18, No. 19), then go to step 27.
24. Disconnect BCM module connector A (40P).
25. Check for continuity between BCM module connector terminal A12 and MCM relay 2 4P connector terminal No. 3.
Is there continuity?
YES - Go to step 26.
NO - Repair open in the wire between MCM relay 2 and the BCM module (A12), then go to step 27.
26. Check for continuity between MCM relay 1 4P connector terminal No. 1 and MCM relay 2 4P connector terminal No. 4.
Is there continuity?
YES - Go to step 35.
NO - Repair open in the wire between MCM relay 1 and MCM relay 2, then go to step 27.
27. Turn the ignition switch OFF.
28. Reconnect all connectors.
29. Reinstall the IPU lid, then turn the battery module switch ON.
30. Turn the ignition switch ON (II).
31. Clear the DTC with the HDS.
32. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U 1205 (75) indicated?
YES - Check for poor connections or loose terminals at the PCM, the BCM module, and the MCM, then go to step 1.
NO - Go to step 33.
33. Monitor the OBD STATUS for DTC U1205 (75) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 32, go to the indicated DTC's troubleshooting.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the PCM, the BCM module, and the MCM, then go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.
34. Turn the ignition switch OFF.
35. Reconnect all connectors.
36. Reinstall the IPU lid, then turn the battery module switch ON.
37. Update the BCM module if it does not have the latest software, or substitute a known-good BCM module.
38. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U1205 (75) indicated?
YES - Check for poor connections or loose terminals at the PCM, the BCM module, and the MCM. If the BCM module was updated, substitute a known-good BCM module, then recheck. If the BCM module was substituted, go to step 1.
NO - Go to step 39.
39. Monitor the OBD STATUS for DTC U1205 (75) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - If the BCM module was updated, troubleshooting is complete. If the BCM module was substitute, replace the original BCM module. If any other Temporary DTCs or DTCs were indicated in step 38, go to the indicated DTC's troubleshooting.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the PCM, the BCM module, and the MCM. If the BCM module was updated, substitute a known-good BCM module, then recheck. If the BCM module was substituted, go to step 1. If the screen indicates NOT COMPLETE, keep the ignition switch ON (II) until a result comes on.
40. Turn the ignition switch OFF.
41. Reconnect all connectors.
42. Reinstall the IPU lid, then turn the battery module switch ON.
43. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
44. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U1205 (75) indicated?
YES - Check for poor connections or loose terminals at the PCM, the BCM module, and the MCM. If the MCM was updated, substitute a known-good MCM, then recheck. If the MCM was substituted, go to step 1.
NO - Go to step 45.
45. Monitor the OBD STATUS for DTC U1205 (75) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM. If any other Temporary DTCs or DTCs were indicated in step 44, go to the indicated DTC s troubleshooting.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the PCM, the BCM module, and the MCM. If the MCM was updated, substitute a known-good MCM, then recheck. If the MCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, keep the ignition witch ON (II) until a result comes on.