B1187

DTC Troubleshooting: B1187

DTC B1187: Gauge Control Module Lost Communication with the SRS Unit (SRS 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. Wait for 6 seconds or more.

4. Check for DTCs with the HDS.

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

NO - Intermittent failure. The gauge control module is OK at this time.


5. Check for DTCs in the SRS with the HDS.

Are any DTCs indicated?
YES - Troubleshoot the SRS DTCs.

NO - Go to step 6.


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

7. Disconnect the gauge control module 36P connector.

8. Disconnect the negative cable from the battery, and wait at least 3 minutes before beginning work.

9. Disconnect SRS unit connector A (28P).

10. Check for continuity between SRS unit connector A (28P) terminals No. 11 and No. 12 and the gauge control module 36P connector terminals No. 28 and No. 29.

Is there continuity?
YES - Substitute a known-good SRS unit, and recheck. If DTC B1187 is indicated again, replace the gauge control module.

NO - Repair an open in the wire.