B1184

DTC B1184: Gauge Control Module Lost Communication with the AHB Servo Unit (RBS 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 to LOCK (0), and then back to ON (II).
3. Check for DTCs with the HDS.

Is DTC B1184 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 brake system DTCs with the HDS.

Are any DTCs indicated?

YES - Troubleshoot the indicated DTC, 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 servo unit 25P connector.
9. Check for continuity between the gauge control module (tach) 36P connector No. 1 and No. 19 terminals and servo unit 25P connector No. 1 and No. 17 terminals individually.






Is there continuity?

YES - Substitute a known-good servo unit and recheck. If DTC B1184 is still indicated, replace the gauge control module (tach).

NO - Repair an open in the wire.