GM Service Manual Online
For 1990-2009 cars only

Backup Lights Diagnostic System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Set the park brake.
  2. Turn the ignition switch to ON position (engine OFF).
  3. Move the transmission gear selector to REVERSE.

The backup lamps turn ON.

Backup Lamps Inoperative

2

Move the transmission gear selector 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.