B1185

DTC Troubleshooting: B1185

DTC B1185:

Gauge Control Module Lost Communication With MCM (BATT Message)

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

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0), and then back to 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 B1178.�

NO -

Go to step 5.

5. Check for IMA system DTCs with the HDS Initial Inspection and Diagnostic Overview.

Are any DTCs indicated?

YES -

Go to the indicated DTCs, then recheck.

NO -

Go to step 6.

6. Turn the ignition switch to LOCK (0).

7. Disconnect the gauge control module (tach) 36P connector.

8. Disconnect the BCM module 40P connector.

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





Is there continuity?

YES -

Substitute a known-good motor control module, and recheck. If the indication goes away, replace the original BCM motor control module MCM Replacement. If the DTC is still present, replace the gauge control module (tach) Gauge Control Module Replacement.�

NO -

Repair an open in the wire.�