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.
    •  Radio Poor Reception

2

Turn the headlamp switch to the PARK position.

    • The radio display dims.
    • The radio face illuminates.
    • The radio buttons illuminate.

3

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

The remote CD changer or cassette tape player functions normally.

    • Speakers Inoperative - One Side w/Remote CD Player

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.