GM Century/Lumina/Grand Prix/Intrigue 1997-2000

Radio Receiver/Amplifier/Tape Player/CD Player



A number of different types and packages of entertainment systems were available on these vehicles, including:

AM/FM Stereo
AM/FM Stereo with Cassette Tape Player
AM/FM Stereo with Cassette Tape Player and Automatic Tone Control
AM/FM Stereo with Cassette Tape Player, Compact Disc Player and Automatic Tone Control

A base radio system consists of the following components:

A radio receiver
Four speakers
An appropriate antenna installation

Depending on the make, model and year of your vehicle, the radio system may also include the following options:

A cassette player with or without Automatic Tone Control
A remote CD changer with or without Automatic Tone Control
A dual cassette/remote CD changer with Automatic Tone Control
A 6 or 8 speaker sound system with various mounting options
A remote CD changer
A rear-shelf mounted amplifier

Your owner's manual is a good reference for operating information since it is applicable to your exact make, model and year.


The radio receives battery voltage at all times through the RADIO fuse to keep the clock and preset station memory alive when the ignition switch is in the OFF position. When the ignition switch in the ACCESSORY or ON position, voltage may be applied through another fuse (for example, on the 2000 Monte Carlo, voltage is applied through the REAR PARK LAMP fuse) to enable radio operation. The radio is grounded through the radio ground circuit. When the ignition switch is in the ACCESSORY or ON position, the Vacuum Fluorescent (VF) display illuminates to display the time or radio frequency setting.

The range for most AM stations is greater that that of FM stations, especially at night. However, the longer range may cause stations to interfere with each other. AM can pick up noise from things like storms and power lines. Reduce the treble to reduce this noise. FM stereo gives the best sound. However, FM signals reach only about 10-40 miles. Tall buildings or hills can interfere with FM signals, causing the sound to come and go. If the reception is poor, tune to a stronger station to improve reception. All factory-equipped sound systems with a FM stereo radio will switch to stereo operation whenever an FM stereo broadcast is being received. One of the following indicators will light on the display: STEREO or ST . Stereo operation means the radio is separating a stereo broadcast back into the original two channels, called left and right.

Compact Disc (CD) and Cassette Player

If equipped, the CD or cassette player is part of the radio unit. When operating, the same power required by the radio is necessary for tape or remote CD changer operation.

Remote Compact Disc (CD) Player

The remote CD Changer receives battery voltage at all times through the RADIO fuse circuit. The remote CD changer is grounded through the radio ground circuit.


Some W-Body vehicles may be equipped with audio systems that have a Theft Deterrent Feature. The radio has this feature if it shows THEFTLOCK® on its face. THEFTLOCK® is designed to discourage theft of the radio. It works by using a secret code to disable all radio functions whenever battery power is removed (as when a battery cable is disconnected). If THEFTLOCK® is active, the THEFTLOCK® indicator will flash when the ignition switch is in the OFF position. The THEFTLOCK® feature for the radio may be used or ignored. If ignored, the system plays normally and the radio is not protected by this feature. If THEFTLOCK® is activated, the radio will not operate if stolen. When THEFTLOCK® is activated, the radio will display "LOC" to indicate a locked condition anytime battery power is removed. If the battery loses power for any reason, you must unlock the radio with the secret code before it will operate. Please consult your owner's manual for complete THEFTLOCK® instructions.

If the vehicle is equipped with a THEFTLOCK® radio and the radio is locked up but the codes have been lost or are unobtainable (change of vehicle ownership, etc.) the Dealer Communications System and Technical Assistance service available at the dealership can be consulted in obtaining a Factory Backup Code.


Radio Assembly
  1. Obtain the THEFTLOCK® codes and radio station presets before attempting to remove the radio, if applicable.
  3. Disconnect the negative battery cable.
  5. Remove the trim plate bezel from around the radio using the following procedure.
    1. Adjust the steering wheel for access.
    3. Remove the ignition switch cylinder bezel.
    5. Remove the left side instrument panel fuse block access opening cover.
    7. Remove the instrument panel cluster trim plate screws.
    9. Starting at the right side of the instrument panel cluster trim plate, grasp the trim plate and carefully pull rearward. Continue working around the trim plate until all of the retainers are released from the trim pad.
    11. Detach the electrical connectors from the hazard switch and remove the trim plate from the vehicle.

  7. Remove the screws from the radio and pull the radio gently from the instrument panel.
  9. Detach the instrument panel wiring harness connector and the antenna cable connector from the radio.

Click image to see an enlarged view

Fig. You must remove the instrument panel cluster trim panel in order to remove the radio assembly

To install:

  1. Installation is the reverse of the removal process, noting the following:
    1. After the electrical connection is secure and the antenna cable is connected, find the radio locator tab.
    3. If the locator tab is difficult to align to the instrument panel locator opening, pull the radio towards you and reposition the antenna cable.
    5. Gently install the radio to the instrument panel, aligning the radio locator tab to the instrument panel locator opening while carefully pressing the radio into the instrument panel until fully seated.

  3. Install the trim plate bezel.
  5. Connect the negative battery cable.
  7. Unlock the THEFTLOCK® radio (if applicable).
  9. Program the radio stations back into the radio as recorded at the beginning of this procedure (if applicable).


Some vehicles may be equipped with a rear-shelf mounted audio amplifier. To replace the amplifier, use the following procedure.

  1. Open the rear compartment (trunk).

Click image to see an enlarged view

Fig. Removing the rear-shelf mounted audio amplifier

  1. Locate the amplifier which is mounted to the underside of the rear shelf (also called the rear window panel). Carefully press the spring clip removal tabs to disengage the amplifier retainers from the rear shelf.
  3. Detach the electric connectors and remove the amplifier from the vehicle.
  5. Installation is the reverse of the removal procedure.


GM recommends that you clean the cassette player every 15 hours of use for the best performance. In addition, they recommend cleaning the cassette player every 50 hours to prevent damage to the tape head. Clean the head and the capstan on the tape player. Leave the tape player in the vehicle, since you can reach the parts through the tape door. Perform this service at least every 50 hours of cassette operation. After 50 hours of tape play CLN (clean) may appear on the display as a reminder. Although the system will still function when this message is displayed, reduced sound quality and possible damage to the cassette tapes may occur.

After cleaning the cassette tape player, press and hold EJECT for 5 seconds to reset the CLN indicator. The radio displays --- to show that the clean feature has been rest.

Keep cassette tapes correctly stored in their plastic cases away from contamination, direct sunlight and extreme heat. Tape cassettes are subject to wear. The sound quality may degrade over time. Before servicing a tape player, verify that the tape is in good condition and that the tape player is clean. If a reduction in sound quality occurs, regardless of when the tape player was last cleaned, play a different tape to see if the tape or the tape player is at fault. If the second cassette tape results in no improvement in sound quality, clean the tape player.

Use a scrubbing action, non-abrasive cleaning cassette (GM J 39916-A, or equivalent) for proper tape player cleaning. This cleaner is a wet-type cleaning system. The wet-type cleaning system uses a cleaning cassette with pads that scrub the tape head as the hubs turn. Using this type of cleaner may cause the radio to display and error and the cartridge to eject. These conditions are normal and is the result of an added feature in the tape player that detects broken tapes. If an error occurs, insert the cleaning cassette at least 3 times to thoroughly clean the tape player. The following steps will enable the radio to accept the tape:

  1. Press and hold the Tape/CD button for 5 seconds.
  3. The radio should display READY.
  5. Insert the cleaner.
  7. Press and hold the Eject button to reset CLN.

  1. You can also use a non-scrubbing, wet-type cleaner. This type of cleaner uses a cassette with a fabric belt which cleans the tape head. This type of cleaning cassette will not cause an error, but may not clean the tape player as thoroughly as the scrubbing type cleaner.