GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the IP dimmer switch to the OFF position.
  2. Turn the headlamp switch to the PARK position.

All of the IP lamps are on.

Refer to Instrument Panel Lamps Inoperative .

2

  1. Turn the ignition switch to ON.
  2. Turn the headlamp switch to PARK.
  3. Turn the panel dimmer switch to full intensity.

The IP lamps brighten.

Refer to Instrument Panel Lamps Inoperative .

3

Turn the IP lamp dimmer switch slowly to the LOW position.

The brightness of the IP lamps slowly decreases to low.

Instrument Panel Lamps Do Not Dim

4

  1. Turn the IP lamp dimmer switch to the OFF position.
  2. Turn the park lamp switch to the OFF position.

All of the IP lamps turn off.

Interior Lamps Always On

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