B1075

DTC Troubleshooting: B1075

DTC B1075: Headlight Switch Signal Error

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 headlights switch from the OFF position to the ON position.

3. Check for DTCs with the HDS.

Is DTC B1075 indicated?
YES - Go to step 4.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.


4. With the headlight switch OFF, select LIGHTING SYSTEM from BODY ELECTRICAL system select menu with the HDS, and enter DATA LIST.

5. Check the ON/OFF information of the HEADLIGHT SWITCH (BACK-UP) in the DATA LIST.

Is the information indicator OFF?
YES - Go to step 6.

NO - Go to step 10.


6. Turn the headlight switch ON.

7. Check the ON/OFF information of the HEADLIGHT SWITCH (BACK-UP) in the DATA LIST.

Is the information indicator ON?
YES - Faulty relay control module; replace the under-hood fuse/relay box.

NO - Go to step 8.


8. Disconnect under-hood fuse/relay box connector J (10P) and the combination switch 12P connector.

9. Check for continuity between the under-hood fuse/relay box connector J (10P) terminal No. 7 and combination switch 12P connector terminal No. 4.

Is there continuity?
YES - Faulty combination switch control unit or relay control module; substitute a known-good combination switch and retest. If the DTC is no longer present, replace the original combination switch. If the DTC is still present, the relay control module is faulty, replace the under-hood fuse/relay box.

NO - Repair an open in the wire.






10. Disconnect under-hood fuse/relay box connector J (10P).

11. Check for continuity between under-hood fuse/relay box connector J (10P) terminal No. 7 and body ground.

Is there continuity?
YES - Repair the short to ground in the wire.

NO - Faulty relay control module; replace the under-hood fuse/relay box.