P1673

DTC P1673 (22): MCM Relay Stays Activated
1. Turn the ignition switch ON (II).
2. Turn the ignition switch ON (II), and then OFF, then wait at least 30 seconds. Turn the ignition switch ON (II) again.
3. Monitor the OBD STATUS for DTC P1673 (22) in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
YES - Go to step 4.
NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MCM relay and the BCM module. If the screen indicates NOT COMPLETED, go to step 3 and recheck.

4. Turn the ignition switch OFF.
5. Turn the battery module switch OFF.
6. Remove the IPU lid.
7. Disconnect BCM module connector A (40P).
8. Check for continuity between body ground and BCM module connector terminal A11.





Is there continuity?
YES - Repair short to ground the wire between MCM relay 1 and the BCM module (A11), then go to step 10.
NO - Go to step 9.

9. Check the MCM relay.
Is the relay OK?
YES - Go to step 16.
NO - Replace the MCM relay, then go to step 11.

10. Reconnect all connectors.
11. Reinstall the IPU lid, then turn the battery module switch ON.
12. Turn the ignition switch ON (II).
13. Reset the BCM module with the HDS.
14. Turn the ignition switch ON (II), and then OFF, then wait at least 30 seconds. Turn the ignition switch ON (II) again.
15. Check for IMA system Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P1673 (22) is indicated, check for poor connections or loose terminals at the MCM relay and the BCM module, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Go to step 16.

16. Monitor the OBD STATUS for DTC P1673 (22) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MCM relay and the BCM module, then go to step 1. If the screen indicates NOT COMPLETED, go to step 14 and recheck.

17. Reinstall the IPU lid, then turn the battery module switch ON.
18. Update the BCM module if it does not have the latest software, or substitute a known-good BCM module.
19. Turn the ignition switch ON (II), and then OFF, then wait at least 30 seconds. Turn the ignition switch ON (II) again.
20. Check for IMA system Temporary DTCs or DTCs with the HDS.
Is DTC P1673 (22) indicated?
YES - Check for poor connections or loose terminals at the MCM relay and the BCM module. If the BCM module was updated, substitute a known-good BCM module, then go to step 19. If the BCM module was substituted, go to step 1.
NO - If no Temporary DTCs or DTCs are indicated, go to step 21. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

21. Monitor the OBD STATUS for DTC P1673 (22) 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 substituted, replace the original BCM module.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MCM relay and the BCM module, then go to step 1. If the screen indicates NOT COMPLETED, go to step 19.