B1075

DTC Troubleshooting: B1075

DTC B1075:

Headlight Switch Back-up 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).

3. Turn the headlight switch ON for 5 seconds and OFF.

4. Check for DTCs with the HDS.

Is DTC B1075 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections.�

5. Select BODY ELECTRICAL SYSTEM SELECT menu, then enter the DATA LIST menu.

6. Check the ON/OFF information of the HEADLIGHT BACK-UP with the HDS.

Is OFF indicated?

YES -

Go to step 7.

NO -

Check for a short in the WHT wire between the combination switch control unit and the relay control module (H/L BACK-UP line) or between the combination switch control unit and the MICU, if the harness is OK, replace the combination switch control unit Service and Repair.�

7. Turn the headlight switch ON.

8. Select BODY ELECTRICAL SYSTEM SELECT menu, then enter the DATA LIST menu.

9. Check the ON/OFF information of the HEADLIGHT BACK-UP with the HDS.

Is ON indicated?

YES -

Go to the relay control module input test Relay Control Module Input Test and check for a poor ground, if the GND line is OK, replace the under-hood fuse/relay box Under-Hood Fuse/Relay Box Removal and Installation.�

NO -

Check for an open in the wire between the combination switch control unit and the relay control module (H/L BACK-UP line) or between the combination switch control unit and the MICU, if the wire is OK, replace the combination switch control unit Service and Repair.�