GM Service Manual Online
For 1990-2009 cars only

Notice: Before adding any sound equipment to the vehicle, such as an audio system, CD player, CB radio, mobile telephone, or two-way radio, make sure that it can be added by checking with your dealer/retailer. Also, check federal rules covering mobile radio and telephone units. If sound equipment can be added, it is very important to do it properly. Added sound equipment can interfere with the operation of the vehicle's engine, radio, or other systems, and even damage them. The vehicle's systems can interfere with the operation of sound equipment that has been added.

Notice: The chime signals related to safety belts, parking brake, and other functions of the vehicle operate through the navigation system. If that equipment is replaced or additional equipment is added to the vehicle, the chimes may not work. Make sure that replacement or additional equipment is compatible with the vehicle before installing it. See "Accessories and Modifications" in the Index of the vehicle's owner manual.

Playing the Radio

(Power/Volume): Press this knob to turn the audio system on and off. Turn the knob to increase or to decrease the volume.

(Tuning/Sound Knob): Turn this knob to go to the next or previous frequency. Press this knob to display the Sound menu. See "Sound Menu" later in this section.

AUDIO: Press this key to display the audio screen. Press the key to switch between AM, FM, or XM, if equipped, DISC, or AUX (Auxiliary), or select the screen button. See CD Player and Auxiliary Devices for more information.

Finding a Station

There are three ways to find/change stations:

    • If viewing a full map screen, use the SEEK keys and the (tune) knob. You cannot change preset stations from the full map screen.

AM source shown, other sources similar


Object Number: 1685917  Size: B3
    • If viewing a full map screen, select the source screen (AM, FM, XM, CD, etc.) button. The display will split between the audio screen and the map screen. All station-changing functions can be performed from this screen.

FM source shown, other sources similar


Object Number: 1685918  Size: B3
    • If you do not want to view a split screen or you are not on a map screen, press the AUDIO hard key to enter the audio menu.
AM/FM/XM: Select the source (AM, FM, or XM, if equipped) screen button or press the AUDIO key repeatedly until the desired source is highlighted.

FM source shown, other sources similar


Object Number: 1685919  Size: B3
Category: Select the screen button, located in the middle of the screen, to receive a list of all of the selected band stations in the area. Use the up and down arrow screen buttons to scroll the frequencies. Select the desired frequency. XM lists will also contain a category to select and the stations or channels that pertain to the category. For XM, select the left and right arrow screen buttons to change categories. The station information will appear on the display. See "Radio Menu" later in this section to add and remove XM categories from the category list. When listening to XM stations, you will be able to select all of the categories when using the right and left arrow screen buttons on the main audio screen. Categories cannot be selected from the category list screen when they have been removed. FM lists may also contain a category to select if stations in your area support Radio Data Systems (RDS).

Refresh List: Select this screen button to refresh the list of stations.

When viewing a map screen, the name of the station or channel will appear on the display.

SEEK / SEEK: To seek stations, press the left or right arrow keys to go to the next or previous station. To scan stations, press and hold either arrow for more than two seconds. The radio will go to a station, play for a few seconds, then go on to the next station. To stop scanning, press either arrow again.

Storing Radio Station Presets

This feature allows you to store up to 30 preset stations. You can mix AM, FM, and XM (if equipped). To store presets, do the following:

  1. Press the (power) knob to turn the system on.
  2. If viewing a map screen, select the source screen button, press the AUDIO key, or press the FAV (favorite) key.
  3. Select the band.
  4. Seek, scan, or tune to the desired station to select the station.
  5. Press and hold one of the preset screen buttons for more than two seconds or until you hear a beep.
  6. Repeat the steps for each preset.

Sound Menu


Object Number: 1750797  Size: B3
(Sound): Press this knob or press the MENU key to access the Sound menu to adjust the treble, midrange, bass, fade, balance, and equalization.

Setting the Tone

TREBLE: Select the plus (+) or minus (-) sign to increase or decrease the treble. If a station is weak or noisy, decrease the treble.

MID (Midrange): Select the plus (+) or minus (-) sign to increase or decrease the midrange.

BASS: Select the plus (+) or minus (-) sign to increase or decrease the bass.

Adjusting the Speakers

L/R (Left/Right) (Balance): To adjust the balance between the left and the right speakers, select and hold the L or R screen buttons.

Front/Rear (Fade): To adjust the fade between the front and the rear speakers, select and hold the Front or Rear screen buttons.

Automatic Equalization

The system has automatic equalization. With automatic equalization, you can select customized equalization settings designed for Rock, Pop, Country, Classical, and Talk. Select one of the screen buttons to hear the change in sound. The system will save the setting for each source.

Custom: Press this screen button to manually change the treble, midrange, bass, balance, and fade without using the automatic equalization setting.

Radio Menu


Object Number: 1685921  Size: B3

Press the MENU key to enter the menu screen, then press the MENU key repeatedly until Radio is selected or select the Radio screen button to make changes for radio information displayed, number of preset pages, XM categories, and automatic volume control.

Additional Information Displayed

Select the Additional Information Displayed screen button to turn station, channel, CD, and MP3 information on or off. The information will display when the screen button is highlighted.

When the screen button is highlighted the system will display, when it is available, for the following; FM: RDS category name and radio text, XM: Song Title and Artist Name, CD: CD text, MP3: tag information.

Number of Preset Pages

Select the Number of Preset Pages screen button to change the number of preset pages, 1 through 6. Each preset page can contain five preset stations. Select the desired numbered screen button.

Automatic Volume Control

Automatic Volume Control: With automatic volume control, your audio system adjusts automatically to make up for road and wind noise as you drive. To use Automatic Volume Control:

  1. Set the volume at the desired level.
  2. Press the MENU key to enter the menu screen, then press the MENU key repeatedly until Radio is selected or touch the Radio screen button
  3. Press the Automatic Volume Control screen button.
  4. Touch the LOW, MEDIUM, or HIGH screen buttons. Each higher setting allows for more compensation at faster vehicle speeds.

Then, as you drive, automatic volume control automatically increases the volume, as necessary, to overcome noise at any speed. The volume level should always sound the same to you as you drive. To turn automatic volume control off, touch the OFF screen button.

Remove/Add XM Categories

Select the Remove/Add XM Categories screen button to remove or add XM categories when selecting XM categories from the category list screen. The list of XM categories will appear on the screen. Use the up and down arrow screen buttons to scroll through the list. The categories to remove will be highlighted and the categories to add will be dark in color. Select the category that you would like to add or remove. Select the Restore All Categories screen button to add all categories that have been removed.

Radio Data System (RDS)

The audio system has a Radio Data System (RDS). RDS features are available for use only on FM stations that broadcast RDS information. With RDS, the radio can do the following:

    • Seek to stations broadcasting the selected type of programming
    • Receive announcements concerning local and national emergencies
    • Display messages from radio stations

This system relies on receiving specific information from these stations and will only work when the information is available. In rare cases, a radio station may broadcast incorrect information that will cause the radio features to work improperly. If this happens, contact the radio station.

The RDS system is always on. When information is broadcast from the FM station you are listening to, the station name or call letters will display on the audio screen. RDS may provide a program type (PTY) for current programming and the name of the program being broadcast.

XM™ Satellite Radio Service

XM™ is a satellite radio service that is based in the 48 contiguous United States and 10 Canadian provinces. XM Satellite Radio has a wide variety of programming and commercial-free music, coast-to-coast, and in digital-quality sound. During your trial or when you subscribe, you will get unlimited access to XM Radio Online for when you are not in the vehicle. A service fee is required to receive the XM service. For more information, contact XM at xmradio.com or call 1-800-929-2100 in the U.S. and xmradio.ca or call 1-877-438-9677 in Canada.

When XM™ is active, the channel name and number, song title, and artist will display on the screen.

XM™ Radio Messages

See "XM™ Radio Messages" in the vehicle's owner manual" for a list of possible XM messages.