DTC Troubleshooting: B1279

DTC B1279: Headlight Switch DIMMER Position Circuit Malfunction

1. Clear the DTCs using the HDS.

1. Cycle the ignition switch to OFF, and then back ON.

1. Check the DTCs by selecting the DTCs MENU (DTCs) from the HDS.

Is DTC B1279 indicated?

YES | - | Go to Step 4 .
NO | - | Intermittent failure. The turn signal switch circuit is OK at this time.■

1. Reset the DTCs by CLEAR MENU (DTC CLEAR) of the HDS.

1. Turn the ignition switch ON (II), then headlight switch ON.

1. Turn the dimmer switch ON and wait for 2 seconds.

1. Pull and hold the combination light switch lever and keep the passing switch position for more 2 seconds.

1. Check for DTCs by selecting the DTCs MENU (DTCs) from the HDS.

Is DTC B1279 indicated?

YES | - | Go to Step 9 (LHD type) or faulty combination light switch control unit; replace the combination light switch (RHD type).
NO | - | Intermittent failure, the combination switch and the combination switch control unit are OK at this time.■

1. Disconnect the combination light switch 12P connector from the wiper/washer switch (LHD type) or combination light switch (RHD type).

1. Perform the combination light switch test (LHD type).

Is the continuity check OK?

YES | - | Faulty combination switch control unit, replace the wiper/washer switch (LHD type).■
NO | - | Replace the combination light switch (LHD type).■