B1279

DTC Troubleshooting: 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 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), then turn the headlight switch ON.

3. Change the combination light switch from low beam to high beam and wait for at least 2 seconds.

4. Pull and hold the combination light switch lever and keep the passing switch position for at least 2 seconds.

5. Check for DTCs with the HDS.

Is DTC B1279 indicated?

YES -

Go to step 6.

NO -

Intermittent failure, the combination light switch and the combination switch control unit are OK at this time. Check for loose or poor connections at the combination switch connector, and at the combination switch control unit connector.�

6. Turn the ignition switch to LOCK (0).

7. Disconnect the combination light switch 12P connector from the wiper/washer switch.

8. Do the combination light switch test Service and Repair.

Is the combination light switch OK?

YES -

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

NO -

Replace the combination light switch.�