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 RUN position.
  2. Turn the radio on.
    • The radio is on.
    • All of the speakers are operating correctly.

2

Turn the parklamps on.

    • The radio display dims.
    • The radio face lights.

Radio Illumination Inoperative with Park Lamps On

3

Insert a test compact disc or tape into the radio and/or CD changer.

The CD changer or tape functions normally.

4

Operate the radio from the radio control switches on the steering wheel.

The radio functions normally.

Steering Wheel Control System Check

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