Control Unit Input Test

1. Before testing, 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.




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. Make these input tests at the fuse/relay box socket and the multiplex connector B.
- 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.