B1957

DTC Troubleshooting: B1957, B1958

DTC B1957:

Rear MICU Lost Communication with Combination Switch Control Unit (HLSW Message)

DTC B1958:

Rear MICU Lost Communication with Combination Switch Control Unit (WIPSW 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 B1957 and/or B1958 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections between the rear MICU and the combination switch control unit.�

5. Check for DTCs with the HDS.

Are DTCs B1007, B1062, B1063, B1155, B1156, B1957, B1958, and/or B2969 all indicated?

YES -

Do the combination switch control unit input test Wiper/Washer Switch (Combination Switch Control Unit) Input Test.�

NO -

Do the rear MICU input test Rear MICU Input Test.�