B1057

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

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in 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. Wait for 6 seconds or more.
4. Check for DTCs with the HDS.

Is DTC B1057 indicated?

YES - Go to step 5.

NO - Intermittent failure, the communication line is OK at this time.

5. Check for DTCs with the HDS.

Are DTCs B1105, B1159, and B1807 also indicated?

YES - Go to MICU input test. MICU Input Test

NO - Go to relay control module input test. Relay Control Module Input Test