Dimmer Switch: Testing and Inspection

Dash Lights Brightness Controller

Controller Input Test

1. Remove the gauge assembly




2. Inspect the gauge assembly connector A (22P) 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 3.

3. Reconnect the connectors to the gauge assembly.




4. Back probe the connector and make these input tests.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, the controller switch board or the main printed circuit board in the gauge assembly must be faulty; replace it.