GM Service Manual Online
For 1990-2009 cars only

IP Lights Dimming System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch to the ON position.
  2. Turn the turn signal/headlamp switch to the PARK position.

The instrument panel lamps illuminate.

Instrument Panel Lamps Inoperative

2

  1. Turn the ignition switch to the ON position.
  2. Turn the headlamp switch to the PARK position.
  3. Use the IP lamp dimmer switch to increase and decrease the brightness of the instrument panel lamps.

The instrument panel lamps increase and decrease brightness when controlled by the dimmer switch.

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