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.
- If the HDS does not communicate with the SRS unit, the SRS indicator stay on, go to symptom troubleshooting for SRS indicator stay on, but no DTCs are stored or cannot be read Symptom Troubleshooting.

1. Clear the DTCs with the HDS.

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

3. Wait for at least 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 (tach) and the SRS unit.�

5. Check for SRS DTCs with the HDS.

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 negative cable from the battery, then wait at least 3 minutes.

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

9. Check for continuity between gauge control module (tach) 36P connector terminals No. 1 and No. 19 and SRS unit connector A (28P) terminals No. 11 and No. 12respectively.





Is there continuity?

YES -

Substitute a known-good SRS unit, 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 (tach) Gauge Control Module Replacement.�

NO -

Repair an open in the wire.�