GM Service Manual Online
For 1990-2009 cars only
Table 1: Radio Display Inoperative
Table 2: Tape Player Inoperative
Table 3: Radio Poor Reception
Table 4: Audio Distortion - One or More Speakers

Radio Display Inoperative

Checks

Actions

The power supply circuit to the fuse Ef2 is open circuit or short circuit.

Repair or replace the power supply wiring harness.

The fuse Ef2 is blown.

Replace the fuse.

The circuit between the fuse Ef2 and the fuse F11 is open or short.

Repair or replace the wiring harness.

The fuse F6 or the fuse F11 is blown.

Replace the fuse.

The audio system circuit to the fuse F6 or the fuse F11 is open circuit or short circuit.

Repair or replace the wiring harness.

Poor ground G201

Repair or replace the wiring harness.

The audio system is out of order.

Replace the audio system.

Tape Player Inoperative

Checks

Actions

Bad-quality tape

Do not use a bad-quality tape.

The tape player destroys a good-quality tape.

Clean the cassette player head, the capstan, and the drive system.

Obstructions behind the tape door

Remove the obstruction using gentle force.

The tape player is out of order.

Replace the audio system.

Radio Poor Reception

Checks

Actions

The audio system is out of order.

Replace the audio system.

AM radio reception is poor--Using a test antenna, test the AM radio reception.

Replace the audio system.

AM radio reception is good--Using a test antenna, test the AM radio reception.

Replace the antenna cable between the audio system and the antenna.

Audio Distortion - One or More Speakers

Checks

Actions

Damage, rattles, or vibration of the speaker and the door area

Make the necessary repairs to secure the component causing the distortion.

Damage, rattles, or vibration of the rear speaker and the rear parallel side shelf

Make the necessary repairs to secure the component causing the distortion.

The circuit between the front speaker connector and the radio connector is open circuit or short circuit.

Repair or replace the wiring harness.

The circuit between the rear speaker connector and the radio connector is open circuit or short circuit.

Repair or replace the wiring harness.

The connection of the front speaker connector and the audio connector is poor.

Confirm the connection.

The connection of the rear speaker connector and the audio connector is poor.

Confirm the connection.

The front speaker is out of order.

Replace the front speaker.

The rear speaker is out of order.

Replace the rear speaker.

The audio system is out of order.

Replace the audio system.