B1055

DTC Troubleshooting: B1055, B1057

DTC B1055: Relay Control Module Lost Communication with MICU (MICU message)

DTC B1057: Relay Control Module Lost Communication with MICU (DOORSW message)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A. 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 6 seconds or more.

4. Check for DTCs with the HDS.

Are DTCs B1055 and/or B1057 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 DTCs with the HDS.

B1055: Are DTCs B1106, B1157, and B1255 also indicated? B1057: Are DTCs B1105 and B1159 also indicated?
YES - Do the MICU input test. Multiplex Integrated Control System MICU Input Test

NO - Do the relay control module input test. Relay Control Module Input Test