GM Service Manual Online
For 1990-2009 cars only

The base radio system consists of the following components:

    • A radio receiver with a cassette player and programmable equalizer
    • Four speakers
    • An antenna module with front and rear window antennas

The radio system may also include the following options:

    • A radio receiver with a CD player and programmable equalizer
    • A radio receiver with a cassette player, CD player and programmable equalizer
    • A remote 6 disc CD changer
    • A 6 speaker sound system
    • A 8 speaker sound system with amplifier

The following radio systems are available:


Object Number: 571573  Size: SH
    • U1N-AM/FM Stereo Cassette with programmable equalizer

Object Number: 571577  Size: SH
    • U1P-AM/FM Stereo CD with programmable equalizer

Object Number: 571580  Size: SH
    • U1Q-AM/FM Stereo Cassette/CD with programmable equalizer

Antenna Module

The radio receives tuner signals from an antenna module. This module uses the following antennas to pick up tuner signals:

    • Front Windshield Antenna - Mounted in the upper right corner of the windshield and used for FM reception only
    • Rear Window Antenna - Mounted along the top grid of the rear window and used for AM and FM reception

The module utilizes the signals of the two antennas for the following reasons:

    • To reduce the amount of fade and breakup due to tall buildings in cities
    • Additional signal strength in fringe reception areas

The radio sends a signal to the module to adjust the signal strength received by it for optimal FM reception.