Headlamp: Testing and Inspection
Auto-off Headlights Control Unit Input Test1. Before testing the auto-off headlights functions, troubleshoot the multiplex control system.
Driver's Multiplex Control Unit:
2. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.
3. Inspect the connector and socket terminals to be sure they are all making good contact.
- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals look OK, go to step 4.
4. With the driver's multiplex control unit still disconnected, make the input test at the connector or driver's under-dash fuse/relay box socket.
- If a test indicates a problem, find and correct the cause, then recheck the system.
- If the input test proves OK, go to step 5.
5. Reconnect the driver's multiplex control unit to the driver's under-dash fuse/relay box, and perform the following input tests at the appropriate connectors on the driver's under-dash fuse/relay box. For driver's under-dash fuse/relay box connector socket location.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 6.
Door Multiplex Control Unit:
6. Remove the driver's door panel, and disconnect the connector A (20P) from the door multiplex control unit.
7. Inspect the connector and socket terminals to be sure they are all making good contact.
- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals look OK, go to step 8.
8. Reconnect the connector to the door multiplex control unit, and make this input test.
- If the test indicates a problem, find and correct the cause, then recheck the system.
- If the input test proves OK, the driver's or door multiplex control unit must be faulty; replace with a known-good unit and retest.