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DTC B1157: Gauge Control Module Lost Communication with Multiplex Integrated Control Unit (MICU)

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 OFF, and then back ON (II).
  3. Check for DTCs with the HDS.

    Is DTC B1157 indicated? 

    1. YES  - Go to step 4.
    2. NO  - Intermittent failure. The gauge control system is OK at this time. Check pinfits and connections.
  4. Check for DTCs with the HDS.

    Is DTC B1055, B1255 and B1806 indicated? 

    1. YES  - Go to MICU INPUT TEST .
    2. NO  - Go to GAUGE CONTROL MODULE INPUT TEST .
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