B1056

DTC Troubleshooting: 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. 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.

Is DTC B1056 indicated?
YES - Do the relay control module input test. Relay Control Module Input Test

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.