GM Service Manual Online
For 1990-2009 cars only

The Radio/Audio System consists of one of two levels of audio entertainment:

    • Base Level
    • Up Level

Radio/Audio System Content

Base Audio System

Up Level Audio System

UM7 Radio with AM/FM Stereo

UM6 Radio with AM/FM Stereo and Auto-Reverse Cassette

Fixed Mast Antenna

Fixed Mast Antenna

Playing the Radio

On/Volume/Balance Knob

Press the On/Volume/Balance knob in order to turn the radio On and Off. Turn the knob clockwise in order to increase the volume and counter clockwise in order to decrease the volume. The ignition lock cylinder must be in the ACCESSORY or the RUN position for the radio to operate.

Finding a Station

Band

In order to tune the radio, push the AM/FM button and select the band. Pressing this button alternately selects either the AM or FM band. The selected band will be on the display.

Tuning

Press the button with the upward arrow in order to increase the frequency. Press the button with the downward arrow in order to decrease the frequency.

In order to use automatic tuning, push one of the tuning buttons for a half a second or longer.

The frequency display will stop automatically when a live frequency is detected.

In order to tune stations manually, push one of the buttons for less than half a second.

SCN

Press the button in order to listen to the next radio station for a few seconds. The radio will scan stations until the scan button is pressed during the five seconds that a station is being reviewed.

Preset Buttons

The numbered preset buttons let you return to your favorite stations. Complete the following steps to preset a station:

Tune in the desired station.

Press one of the preset buttons for 2 seconds or longer.

Whenever you press that numbered button for less than 2 seconds, the station you set will return.

Setting the Tone

Turn the tone knob clockwise in order to emphasize the treble. Turn the tone knob counterclockwise in order to emphasize the bass.

Adjusting the Speakers

Pull out the Power/Volume/Balance knob. Turn the knob to the right or left, depending on which speakers you want the sound to come through.

Setting the Clock

Press and hold down the AM/FM button. Press the downward arrow button in order to advance the hours. Press upward arrow button in order to advance the minutes.

Playing a Cassette Tape (UM6)

The tape player is built to work best with tapes that are 30 to 45 minutes long on each side. Tapes longer than that are so thin they may not work well in this player.

Once the tape is playing, use the knobs for volume, tone and balance, just as you do for radio operation.

FF/Rew Buttons

Press the button with the arrows in the same direction of tape play, as indicated on the display, in order to rapidly advance the tape.

Press the other button in order to rewind the tape.

In order to stop fast forwarding or rewinding, press the other button lightly.

Press both fast forward buttons at the same time in order to switch the tape sides. An arrow will light on the display in order to indicate the tape playing direction.

Eject Button

Press this button in order to remove the tape or stop the tape and play the radio.