B1278

DTC B1275: Combination Light Switch OFF Position Circuit Malfunction

DTC B1276: Combination Light Switch Parking (SMALL) Position Circuit Malfunction

DTC B1277: Headlight Switch AUTO Position Circuit Malfunction

DTC B1278: Headlight Switch ON Position Circuit Malfunction

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. Operate each combination light switch position for more than 2 seconds, then turn the combination light switch OFF.
4. Check for DTCs with the HDS.

Is DTC B1275, B1276, B1277 and/or B1278 indicated?

YES - Go to step 5.

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

5. Turn the ignition switch OFF.
6. Disconnect the combination light switch 12P connector from the combination light switch.
7. Do the combination light switch test and check for open or short in the combination light switch terminals in each switch position.

Is the combination light switch OK?

YES - Faulty combination switch control unit, replace the wiper/washer switch.

NO - Replace the combination light switch.