Ignition Key In Signal: Testing and Inspection

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.