Windshield Washer Control Module: Testing and Inspection
Control Unit Input Test1. Before testing the wiper/washer control functions, troubleshoot the multiplex control system.
Multiplex Control Unit, Driver's:
2. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box, and disconnect its connector.
3. Inspect all connector and socket terminals to be sure they are 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 unit still disconnected, make these input tests at the connector and fuse/relay box socket.
- 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 5.
Multiplex Control Unit, Passenger's
5. Remove the passenger's under-dash fuse/relay box.
6. Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.
7. Inspect all connector and socket terminals to be sure they are 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. With the passenger's unit still disconnected, make these input tests at the connector and the fuse/relay box socket.
- If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the control unit must be faulty; replace it.