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 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.
Are there any DTCs indicated?

YES -Go to the indicated DTC's troubleshooting, then recheck.

NO -
- '09-11 models, go to step 6.
- '12- model, go to step 10.
Turn the ignition switch to LOCK (0).
Disconnect gauge control module connector B (14P).
Disconnect SRS unit connector A (28P).
Check for continuity between gauge control module connector B (14P) terminal No. 1 and the SRS unit connector A (28P) terminal No. 12, and between the gauge control module connector B (14P) terminal No. 8 and the SRS unit connector A (28P) terminal No. 11 respectively.

Fig 1: Checking Continuity Between Gauge Control Module B (14P) And SRS Unit Connector A (28P) Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

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

NO -Repair an open or high resistance in the wire. ■
Turn the ignition switch to LOCK (0).
Disconnect gauge control module connector B (14P).
Disconnect SRS unit connector A (39).
Check for continuity between gauge control module connector B (14P) terminal No. 1 and SRS unit connector A (39P) terminal No. 16, and between gauge control module connector B (14P) terminal No. 8 and SRS unit connector A (39P) terminal No. 17 respectively.

Fig 2: Checking Continuity Between Gauge Control Module Connector B (14P) Terminal No. 1 And SRS Unit Connector A (39P) Terminal No. 16
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Update the SRS unit if it does not have the latest software (see SRS UNIT UPDATE ), or substitute a known-good SRS unit, and recheck. If the symptom/indication goes away with a known-good SRS unit, replace the original SRS unit (see SRS UNIT REPLACEMENT ). If the DTC is still present, replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).■

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