GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Apply the park brake.
  2. Turn the ignition switch to the RUN position.
  3. Shift the transaxle into REVERSE.

The backup lamps turn ON.

2

Shift the transaxle into PARK or NEUTRAL.

The backup lamps are OFF.

Backup Lamps Always On

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