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.

Backup lamps are off.

Backup Lamps Always On

2

Place the gear selector lever in the REVERSE position.

Backup lamps light.

3

Place the gear selector lever in the NEUTRAL position.

Backup lamps turn off.

Backup Lamps Always On

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