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. See TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A .

Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0), and then back to ON (II).
Wait for at least 6 seconds.
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.
Check for DTCs in the SRS with the HDS.
Are any DTCs indicated?

YES - Troubleshoot the SRS DTCs.

NO - Go to step 6.
Turn the ignition switch to LOCK (0).
Disconnect gauge control module connector B (28P).
Disconnect the negative cable from the battery, and wait at least 3 minutes before beginning work.
Disconnect SRS unit connector A (39P).
Check for continuity between SRS unit connector A (39P) terminals No. 16 and No. 17 and gauge control module 36P connector terminals No. 15 and No. 16 respectively.

Fig 1: Checking Continuity Between Connector (39P) Terminals No. 16 And No. 17 And 36P Connector Terminals No. 15 And No. 16

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Substitute a known-good SRS unit, and recheck. If DTC B1187 is indicated again, replace the gauge control module. See GAUGE CONTROL MODULE REPLACEMENT .

NO - Repair an open or high resistance in the wire.