DTC B1187: Gauge Control Module Lost Communication with 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 OFF, and then back ON (II).
Wait for 6 seconds or more.
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.
Check for SRS DTCs with the HDS (see GENERAL TROUBLESHOOTING INFORMATION ).
Are any DTCs indicated?

YES -Go to the indicated DTCs troubleshooting, then recheck.

NO -Go to step 6.
Turn the ignition switch OFF.
Disconnect gauge control module connector A (30P).
Disconnect the negative cable from the battery, and wait at least 3 minutes before beginning work.
Disconnect SRS unit connector A (28P).
Check for continuity between gauge control module connector A (30P) No. 13 and No. 14 terminals and SRS unit connector A (28P) No. 20 and No. 21 terminals individually.

Fig 1: Checking Continuity Between Gauge Control Module Connector A (30P) And SRS Unit Connector A (28P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Substitute a known-good SRS unit, and recheck. If the indication goes away, replace the original SRS unit. If the DTC is still present, replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).

NO -Repair an open in the wire.