IMA System
DTC Troubleshooting: U1207 (80)
DTC U1207 (80):
IMA-CAN Malfunction (A/C Compressor Driver-BCM Module)
NOTE: Before you troubleshoot, record all freeze data, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
1. Turn the ignition switch to 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) U0037.
NO -
Go to step 3.
3. Clear the DTC with the HDS Initial Inspection and Diagnostic Overview.
4. Check for Pending or Confirmed DTCs with the HDS.
Is DTC U1207 (80) 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 BCM module, the A/C compressor driver, and the PCM.�
5. Turn the ignition switch to LOCK (0).
6. Turn the battery module switch OFF High Voltage Safety.
7. Remove the IPU lid IPU Lid Removal/Installation.
8. Check the A/C compressor driver 4P connector.
Is the connector OK?
YES -
Go to step 9.
NO -
Repair the connector, then go to step 19.
9. Check the No. 22 IG1 HAC (A/C) (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES -
Go to step 10.
NO -
Repair short to ground in the wire between the A/C compressor driver and the No. 22 IG1 HAC (A/C) (7.5 A) fuse. Also replace the No. 22 IG1 HAC (A/C) fuse, then go to step 19.
10. Disconnect the A/C compressor driver 4P connector.
11. Disconnect BCM module connector A (40P).
12. Check for continuity between BCM module connector terminal A20 and A/C compressor driver 4P connector terminal No. 2.
Is there continuity?
YES -
Go to step 13.
NO -
Repair open in the wire between the BCM module (A20) and the A/C compressor driver, then go to step 19.
13. Check for continuity between BCM module connector terminal A40 and A/C compressor driver 4P connector terminal No. 3.
Is there continuity?
YES -
Go to step 14.
NO -
Repair open in the wire between the BCM module (A40) and the A/C compressor driver, then go to step 19.
14. Turn the ignition switch to ON (II).
15. Measure the voltage between A/C compressor driver 4P connector terminal No. 4 and body ground.
Is there 12 V battery voltage?
YES -
Go to step 16.
NO -
Repair open in the wire between the A/C compressor driver and the No. 22 IG1 HAC (A/C) (7.5 A) fuse, then go to step 18.
16. Turn the ignition switch to LOCK (0).
17. Check for continuity between A/C compressor driver 4P connector terminal No. 1 and body ground.
Is there continuity?
YES -
Replace the A/C compressor driver Service and Repair, then go to step 19.
NO -
Repair open in the wire between the A/C compressor driver and G902, then go to step 19.
18. Turn the ignition switch to LOCK (0).
19. Reconnect all connectors.
20. Reinstall the IPU lid IPU Lid Removal/Installation, then turn the battery module switch ON High Voltage Safety.
21. Turn the ignition switch to ON (II).
22. Clear the DTC with the HDS Initial Inspection and Diagnostic Overview.
23. Check for Pending or Confirmed DTCs with the HDS.
Is DTC U1207 (80) indicated?
YES -
Check for poor connections or loose terminals at the BCM module, the A/C compressor driver, and the PCM, then go to step 1.
NO -
Go to step 24.
24. Monitor the OBD STATUS for DTC U1207 (80) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 23, go to the indicated DTC's troubleshooting.�
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the BCM module, the A/C compressor driver, and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.