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.

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2

Turn the illumination controller knob slowly counterclockwise.

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

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