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B1075
DTC B1075: Headlight SWITCH Signal ErrorNOTE: 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 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 headlight circuit is OK at this time. Check for loose or poor connections at under-hood fuse/relay box connector J (10P), and at the combination switch connector.
4. With the headlight switch OFF, select LIGHTING SYSTEM from the HDS, and enter the 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 the under-hood fuse/relay box connector J (10P) and the combination switch 12P connector.
9. Check for continuity between the No. 7 terminal of under-hood fuse/relay box connector J (10P) and the No. 4 terminal of the combination switch 12P connector.
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 WHT wire.
10. Disconnect under-hood fuse/relay box connector J (10P).
11. Check for continuity between the No. 7 terminal of under-hood fuse/relay box connector J (10P) and body ground.
Is there continuity?
YES - Repair the short in the WHT wire.
NO - Faulty relay control module; replace the under-hood fuse/relay box.