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Home >> Acura >> 2009 >> RL >> Repair and Diagnosis (Single Page) >> Electrical >> Fuses & Circuit Breakers >> Under-Hood Fuse/Relay Box >> DTC Troubleshooting >> DTC B1055, B1056: Relay Control Module Lost Communication with MICU (MICU Message); Relay Control Module Lost Communication With MICU (ALARM Message)
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DTC B1055, B1056: Relay Control Module Lost Communication with MICU (MICU Message); Relay Control Module Lost Communication With MICU (ALARM 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 ).
  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 B1055 and/or B1056 indicated? 

    YES  - Go to step  5.

    NO  - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the relay control module and the MICU.

  5. Check for DTCs with the HDS.

    Are DTCs B1157, B1255, B1605, B1806, B2107 and B2155 all indicated? 

    YES  - Do MICU INPUT TEST .

    NO  - Do RELAY CONTROL MODULE INPUT TEST .