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DTC B1255: Combination Switch Control Unit Lost Communication With 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 B1255 indicated? 

    1. YES  - Go to step  4.
    2. NO  - Intermittent failure, MICU is OK at this time. Check for loose or poor connection at combination switch control unit connector (8P), and at under-dash fuse/relay box connector X (39P). If the connections are good, check the battery condition (see BATTERY TEST ) and the charging system.
  4. Check for DTCs with the HDS.

    Are DTCs B1055, B1157 and B1806 indicated? 

    1. YES  - Go to MICU INPUT TEST  .
    2. NO  - Replace the combination switch control unit.
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