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B1279
DTC B1279: Headlight Switch DIMMER Position Circuit MalfunctionNOTE: 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 dimmer switch from low beam to high beam and wait for 2 seconds.
4. Pull and hold the dimmer 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 - Faulty combination switch control unit, replace the combination switch.
NO - Intermittent failure, the combination switch control unit is OK at this time. Check for loose or poor connections at the combination switch connector.