GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch to the ON position.
  2. Place the gear selector lever in the PARK position.
  3. Press the MIRROR button on automatic day/night mirror switch.
  4. Cover the mirror forward light sensor (windshield side) with a dark cloth.
  5. Shine an incandescent light on the mirror rearward light sensor (mirror side).

The inside automatic day/night mirror and LH mirror gradually darken.

2

Place the gear selector lever in the REVERSE position.

The inside automatic day/night mirror and LH mirror gradually lighten to a clear state.

3

Place the gear selector lever in the PARK position.

The inside automatic day/night mirror and LH mirror gradually darken.

4

Remove the light from the automatic day/night mirror.

The inside automatic day/night mirror and LH mirror gradually become lighter, but does not enter a clear state.

5

With a compass, press the COMPASS button on automatic day/night mirror switch.

The compass display on the automatic day/night mirror turns on and the correct direction is shown.

Mirror Compass Display Inoperative or Inaccurate

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