GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the light switch to the PARK/HEAD position.
  2. Turn the illumination controller knob fully clockwise.

All the panel illumination lamps light at full brilliance.

Instrument Panel Lamps Inoperative

2

Turn the illumination controller knob slowly counterclockwise.

All panel illumination lamps dim as you turn the illumination controller.

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.