B1057

DTC Troubleshooting: 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 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 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.�