GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch on.
  2. Turn the radio on.
    • The radio turns on.
    • All speakers are working.

2

Turn the headlamp switch to the PARK or HEAD position.

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

Radio Illumination Inoperative with Park Lamps On

3

Insert test Compact Disc (CD) or audio tape in the radio.

The radio plays the CD or tape.

4

Operate the radio from the LH steering wheel control switch.

The LH steering wheel control switch operates radio functions: volume up/down, program and seek.

Steering Wheel Controls Inoperative

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