GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch to ON.
  2. Engage the parking brake.
  3. Move the manual selector selector to the reverse position.

Both of the backup lamps light.

Backup Lamps Inoperative

Backup Lamp Inoperative - One Lamp

2

Move the manual selector to the park or neutral postion.

The backup lamps go out.

Backup Lamps Always On

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