GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Body and Accessories 🢒 Entertainment 🢒 Radio/Audio System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Turn the ignition switch to the ON position, with the engine OFF.
  2. Turn the radio ON.
  3. Position tuner on a strong radio station.
  4. Set the volume control to medium.

Radio display illuminates and sound is heard from speakers.

2
  1. Turn the FADE control to the front speakers and then to the rear speakers.
  2. Return FADE control to the neutral position.
    • Only front speakers are heard.
    • Only rear speakers are heard.
    • Front and rear speakers are heard.

Speakers Inoperative - One

3
  1. Turn the BAL control to the left side speakers and then to the right side speakers.
  2. Return BAL control to the neutral position.
    • Only left side speakers are heard.
    • Only right side speakers are heard.
    • Left and right side speakers are heard.

Speakers Inoperative - One

4
  1. Depress the RECALL button.
  2. Adjust BASS control to the high and low position.
  3. Adjust TREB control to the high and low position.
  4. Return BASS and TREB control buttons to the neutral position.
    • Radio display toggles between the tuner and the clock.
    • Music attenuates between high and low bass frequencies.
    • Music attenuates between high and low treble frequencies.
    • Music returns to nominal bass and treble frequencies.

Speakers Inoperative - One

5
    • Place the headlamp and dimmer switch in the PARK position.
    • Rotate dimming switch left to right.

Radio Display and the button illumination intensity vary.

7
  1. Place a cassette tape in the tape player.
  2. Operate all of the available features.
  3. Eject the cassette.
    • The cassette tape plays.
    • All features operate.
    • The cassette tape ejects.

8
  1. Play a compact disc (CD).
  2. Operate all of the available features.
  3. Eject the CD
  4. Turn the headlamp and panel dimmer switch to the park position.
  5. Adjust the dimming switch to the maximum intensity and then to the minimum intensity.
    • CD plays.
    • All features operate.
    • The CD ejects.
    • Remote CD player illumination varies intensity.

9
  1. Press the power button on the rear stereo audio controller.
  2. Operate the available features.
  3. Place the headlamp and panel dimmer switch to the PARK position.
  4. Connect headphones to the rear stereo audio controller.
    • Power illuminates.
    • Rear door speakers and the rear headliner speakers mute.
    • The rear stereo audio controller backlights.
    • Sound is heard from the headphones.

9
  1. Insert CD(s) into the CD changer.
  2. Select CD to be played.
    • CD changer will shuffle the CD(s).
    • CD will be heard through the speakers or headphones.

Remote Playback Device Inoperative