B1255

DTC B1255: Combination Switch Control Unit Lost Communication With MICU (MICU 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. Check for DTCs with the HDS.

Is DTC B1255 indicated?

YES - Go to step 4.

NO - Intermittent failure, MICU is OK at this time. Check for loose or poor connection at combination switch control unit connector (12P), and at under-dash fuse/relay box connector X (39P). If the connections are good, check the battery condition and the charging system.

4. Check for DTCs with the HDS.

Are DTCs B1055, B1106, and B1157 also indicated?

YES - Go to MICU input test. MICU Input Test

NO - The combination switch control unit is faulty; replace the combination switch.