B1187

DTC Troubleshooting: B1187

DTC B1187: Gauge Control Module Lost Communication with SRS Unit (SRS Message)

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back ON (II).

3. Wait for more than 6 seconds.

4. Check for DTCs with the HDS.

Is DTC B1187 indicated?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the gauge control module and the SRS unit.


5. Check for SRS DTCs with the HDS.

Are there 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 gauge control module connector A (12P).

8. Disconnect SRS unit connector A. SRS Unit Replacement

9. Check for continuity between gauge control module connector A (12P) No. 6 and SRS unit connector A (28P) terminal No. 12, and between gauge control module connector A (12P) terminal No. 12 and SRS unit connector A (28P) terminal No. 11.

Is there continuity?
YES - Substitute a known-good SRS unit SRS Unit Replacement, and recheck. If the indication goes away, replace the original SRS unit. SRS Unit Replacement If the DTC is still present, replace the gauge control module. Service and Repair

NO - Repair an open in the wire.