Wiper Control Module: Testing and Inspection
Control Unit Input TestWindshield
1. Before testing the wiper/washer control functions, troubleshoot the multiplex control system. Multiplex Control Unit Input Test
Driver's Multiplex Control Unit
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 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 these input tests at the connector and driver's under-dash fuse/relay box sockets.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, driver's multiplex control unit must be faulty; replace it.
Rear Window
1. Before testing the wiper/washer control functions, troubleshoot the multiplex control system.
Passenger's Multiplex Control Unit
2. Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.
3. Inspect all 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 passenger's multiplex control unit still disconnected, make these input tests at the connector and passenger's underdash fuse/relay box sockets.
- 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 the control unit.