Dimmer Switch: Testing and Inspection

Dash Lights Brightness Controller

Controller Input Test:

CAUTION:
^ All SRS wire harnesses are covered with yellow insulation. Before you disconnect any part of an SRS wire harness, disconnect the airbag connectors.
^ Whenever the ignition switch is ON (II), or has been turned OFF for less than three minutes, be careful not to bump the SRS unit; the airbags could accidentally deploy and cause damage or injuries.
^ For additional precautions, refer to the Air Bags and seat belts.

NOTE: The control unit is built into the dash lights brightness controller.

Controller Input Test:

1. Remove the gauge assembly.
2. Disconnect the 3P connector from the dash lights brightness controller.

Controller Input Test:

3. Inspect the connector 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, make the following input tests at the terminals.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all input tests prove OK, the dash lights brightness controller must be faulty; replace it.