B1185

DTC B1185: Gauge Control Module Lost Communication with the Motor Control Module (MCM) (BATT Message)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, and then back ON (II).
3. Check for DTCs with the HDS.

Is DTC B1185 indicated?

YES - Go to step 4.

NO - Intermittent failure. The gauge control module (tach) is OK at this time. Check for loose or poor connections.

4. Check for DTCs with the HDS.

Are DTCs B1168, B1169, B1178, B1183, B1184, B1185, and B1187 all indicated at the same time?

YES - Troubleshoot DTC B1178.

NO - Go to step 5.

5. Check for IMA system DTCs with the HDS.

Is any DTCs indicated?

YES - troubleshoot the indicated DTC, then recheck.

NO - Go to step 6.

6. Turn the ignition switch OFF.
7. Disconnect the gauge control module (tach) 36P connector.
8. Disconnect the BCM module 40P connector.




9. Check for continuity between the gauge control module (tach) 36P connector No. 1 and No. 19 terminals and BCM module 40P connector No. 1 and No. 21 terminals individually.

Are there continuity?

YES - Substitute a known-good motor control module and recheck. If DTC B1185 is still indicated, replace the gauge control module (tach).

NO - Repair an open to power in the wire.