B1279

DTC B1279: Headlight Switch DIMMER 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), then turn the headlight switch ON.
3. Change the combination light switch from low beam to high beam and wait for 2 seconds.
4. Pull and hold the combination light switch lever and keep the passing switch position for more than 2 seconds.
5. Check for DTCs with the HDS.

Is DTC B1279 indicated?

YES - Go to step 6.

NO - Intermittent failure, the combination switch and the combination switch control unit are OK at this time. Check pinfits and connections.

6. Turn the ignition switch OFF.
7. Disconnect the combination light switch 12P connector from the wiper/washer switch.
8. Perform the combination light switch test.

Is the combination light switch OK?

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

NO - Replace the combination light switch.