GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch off for at least 2 minutes.
  2. Turn off all of the courtesy lamps.
  3. Close all of the doors.
  4. Open either of the front doors.

The courtesy lamps turn on.

Courtesy Lamps Inoperative with Doors Open

2

Close both of the front doors and release the door handles.

The courtesy lamps remain on for about 40 seconds.

Courtesy Lamps Inoperative

3

  1. Raise a door handle or open and then close either front door.
  2. Turn the ignition switch to the RUN position before 40 seconds pass.

The courtesy lamps turn off as soon as the ignition switch is turned to RUN.

Courtesy Lamps Inoperative

4

  1. Turn the ignition switch off.
  2. Turn the ignition switch to RUN and then off.
  3. Open and then close either front door within 2 minutes.

The courtesy lamps remain on for about 4 seconds.

5

  1. Turn the ignition switch to LOCK.
  2. Open and then close each rear door, one at a time.

The courtesy lamps turn on when either rear door is opened and remain on for about 4 seconds.

Courtesy Lamps Inoperative with Doors Open

6

Turn the interior lamps switch to ON and then to OFF with all of the doors closed (allow 40 seconds for the illuminated entry feature to time-out).

The courtesy lamps turn on while the switch is in the ON position.

Courtesy Lamps Inoperative with Instrument Panel Dimmer Switch

7

    Important: Power output diagnostic mode note

  1. The following actions are to test the operation of the following:
  2. • The parasitic power control
    • The courtesy lamp control
    • The inadvertent power control outputs
  3. Engage the parking brake.
  4. Close the front doors.
  5. Turn the ignition switch to the RUN position.
  6. Before 15 seconds pass perform the following actions:
  7. • Open the right front door.
    • Cycle the headlamp switch from OFF to PARK 3 times.
    • The interior lamps flash until the ignition switch is turned off.
    • The multi-function alarm module returns to the normal function.

Courtesy Lamps Inoperative with Instrument Panel Dimmer Switch

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