Control Unit Input Test
Dash Lights Brightness ControllerControl Unit Input Test
NOTE: If only the gauge lights do not work, check the gauge circuit and unit first ('04 model).
1. Before testing the dash lights brightness control 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 these input tests at the connector and driver's under-dash 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.
5. Reconnect the driver's multiplex control unit to the driver's under-dash fuse/relay box, and perform the given input tests at the appropriate connectors on the driver's under-dash fuse/relay box.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- if all the input tests prove OK, the driver's multiplex control unit must be faulty; replace it.