Automatic Day/Night Mirror Test

Operational test:
- Turn ignition switch to the ON position with the vehicle in park.
- Place mirror switch in the high position.
- Cover the forward facing sensor with dark cloth to keep out any ambient light.
- Shine a light into the rear facing sensor, watch to see if the mirror darkens.

With the mirror darkened, place the vehicle in reverse, the mirror should return to its normal condition.

If the above conditions are met the mirror is operating properly. If not OK, test voltage.

Test three way connector harness.
1. Pin 1 Ignition Switch in run position, should have battery voltage.
2. Pin 2 Should have continuity to Ground.
3. Pin 3 Senses when the transmission is in reverse. There should be battery voltage present when transmission is in the reverse position.
4. If test is OK replace Mirror.
5. If not refer Wiring Diagrams to test the circuits.