B1056

DTC B1056: 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.

1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF and then back ON (II).
3. Wait for 6 seconds.
4. Check for DTCs with the HDS.

Is DTC B1056 indicated?

YES - Go to the relay control module input test. Relay Control Module Input Test

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