DTC B1279: Headlight Switch DIMMER Position Circuit Malfunction
- Clear the DTCs using the HDS.
- Cycle the ignition switch to OFF, and then back ON.
- Check for DTCs using the HDS.
Is DTC B1279 indicated?
YES - Go to step 4.
NO - Intermittent failure. The turn signal switch circuit is OK at this time. Check pinfits and connections.
- Reset the DTCs by CLEAR MENU (DTC CLEAR) of the HDS.
- Turn the ignition switch ON (II), then turn the headlight switch ON.
- Change the combination light switch from low beam to high beam and wait for 2 seconds.
- Pull and hold the combination light switch lever and keep the passing switch position for more than 2 seconds.
- Check for DTCs by selecting the DTCs MENU (DTCs) from the HDS.
Is DTC B1279 indicated?
YES - Go to step 9.
NO - Intermittent failure, the combination switch and the combination switch control unit are OK at this time. Check pinfits and connections.
- Disconnect the combination light switch 12P connector from the wiper/washer switch.
- Perform the combination light switch test (see COMBINATION LIGHT SWITCH TEST/REPLACEMENT
).
Is the combination light switch OK?
YES - Faulty combination switch control unit, replace the wiper/washer switch.
NO - Replace the combination light switch.