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HOMESERVICE MANUALSBUICK2012VERANOREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 28 (GAUGES)DTC TROUBLESHOOTINGDTC B1185: GAUGE CONTROL MODULE LOST COMMUNICATION WITH MOTOR CONTROL MODULE (MCM)
2012 Buick Verano

DTC B1185: Gauge Control Module Lost Communication With Motor Control Module (MCM)

2012 Buick VeranoSECTION DTC B1185: Gauge Control Module Lost Communication With Motor Control Module (MCM)
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
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 ).
  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 B1185 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure, the system is OK at this time. Check for loose or poor connections.

  5. Check for IMA system DTCs with the HDS (see GENERAL TROUBLESHOOTING INFORMATION ).

    Is any DTCs indicated? 

    YES  -Go to the indicated DTC, then recheck.

    NO  -Go to step 6.

  6. Turn the ignition switch to LOCK (0).
  7. Disconnect the gauge control module 32P connector.
  8. Disconnect motor control module connector A (31P).
  9. Check for continuity between gauge control module 32P connector terminals No. 19 and No. 20 and motor control module connector A (31P) terminals No. 30 and No. 31 respectively.
    Fig 1: Checking Continuity Between Gauge Control Module 32P Connector Terminals No. 19 And Motor Control Module Connector A (31P) Terminals No. 30
    G06431715Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

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

    NO  -Repair an open in the wire.

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