Battery positive voltage is provided to the radio from the Radio/Amp (25A) fuse in the fuse block. The radio is grounded through a braided cable case ground. The radio is enabled/disabled by class 2 messages from the body control module (BCM). The entertainment system on this vehicle is configured with a base and uplevel system. The base and uplevel systems contain a radio, antenna, speakers, and on some vehicles an audio amplifier.

The uplevel system differs from the base system by providing the customer with enhanced audio system features. Some of those features may include an audio amplifier, and programmable equalizer (EQ). Satellite digital radio (U2K) is available with the uplevel systems.

The following list shows the audio system RPOs available with this vehicle:

Song List (U1V only)

The 6-disc CD changer has a feature called song list. This feature is capable of saving 20 track selections.

To save tracks into the song list, perform the following steps:

1. Turn the radio ON and load it with at least one CD.
2. Check to see that the CD changer is not in song list mode. S-LIST should not appear in the display. If song list mode is ON, press the song list button to turn it OFF.
3. Select the desired CD by pressing the numbered pushbutton and then use the SEEK left arrow to locate the track to be saved. The track will begin to play.
4. Press and hold the song list button for 2 or more seconds to save the track into memory. When the song list button is pressed, a beep with be heard immediately. After 2 seconds of pressing the button, 2 beeps will sound to confirm that the track has been saved and TRACK (number) ADDED will appear on the display.
5. Repeat steps 3 and 4 for saving other selections.

SONG LIST FULL will appear on the display if your try to save more than 20 selections.

To play the song list, press the song list button. One beep will be heard and SONG LIST will appear on the display. The recorded tracks will begin to play in the order that they were saved.

Seek through the song list by using the SEEK arrows. Seeking past the last saved track will return you to the first saved track.

To delete tracks from the song list, perform the following steps:

1. Turn the CD player ON.
2. Press the song list button to turn song list ON. S-LIST will appear on the display.
3. Press either SEEK arrow to select the desired track to be deleted.
4. Press and hold the song list button for 2 seconds. After 2 seconds of continuously pressing the button, 2 beeps will be heard to confirm that the track has been deleted and TRACK (number) DELETED will appear on the display.

After a track has been deleted, the remaining tracks are moved up list. When another track is added to the song list, the track will be added to the end of the list.

To delete the entire song list, perform the following steps:

1. Turn the CD player ON.
2. Press the song list button to turn song list mode on. S-LIST will appear on the display.
3. Press and hold the song list button for more than 4 seconds. A beep will be heard, followed by 2 beeps after 2 seconds, and a final beep with be heard after 4 seconds. SONG LIST EMPTY will appear on the display, indicating that the song list has been deleted.

If a CD is ejected, and the song list contains saved tracks from the CD, those tracks are automatically deleted from the song list. Any tracks saved to the song list again are added to the bottom of the list.

To end song list mode, press the song list button. One beep will be heard and S-LIST will disappear from the display.

Each item in the following list represents topics covered in detail below:

Radio Signal

The radio signal is sent from a broadcast station and is then received by an antenna. The strength of the signal received depends on the following:

AM Reception

The AM band has a lower frequency range than the FM band. These longer wavelengths:

The AM frequencies have longer range due to the ground wave. The ground wave follows the curvature of the earth and is affected by its conductivity. Greater conductivity equates to less signal loss, thus transmission over water is better than over land. The AM band has a range of 80-320 km (50-200 mi).

FM Reception

The shorter wavelengths of the higher frequency FM band:

Broadcasts in the FM band are limited to "line of sight" reception which is typically 40 km (25 mi). Even when out of a direct line of sight, the signal may be reflected into areas that would be in a "shadow" otherwise. Factors which affect the line of sight include:

XM satellite radio provides digital radio reception. The XM signal is broadcast from two satellites and, where necessary, terrestrial repeaters. The high power satellites allow the antenna to receive the XM signal even when foliage and other partial obstructions block the antennas view of the satellite. Terrestrial repeaters are used in dense urban areas. These repeaters will receive the satellite signal and re-broadcast them at much higher power levels in order to ensure reception in areas with densely packed tall buildings.

Antenna

The antenna system is a rear window defogger grid antenna. Using the defogger grid as an antenna requires circuitry to decouple the RF from the DC heater current. This is accomplished by the radio antenna module.

Audio Amplifier

The purpose of the amplifier is to increase the power of a voltage or current signal. The output signal of an amplifier may consists of the same frequencies as the input signal or it may consist of only a portion of the frequencies of the input signal as in the case of a subwoofer or midrange amplifier.

When the radio is turned ON, it sends a voltage signal to the audio amplifier via the radio on signal circuit. The gain control signal circuit allows the radio to recognize that the amplifier is present. Once the radio detects the amplifier, the radio will output low-level signals to the amplifier. With the amplifier enabled, the signal that drives the speaker is now amplified.

The "Theftlock" theft deterrent system is a feature on all base and uplevel radios. There is no need to program a security code into the radio as in past model years. The theft deterrent system now utilizes class 2 serial data to determine if the radio is in the appropriate vehicle. Each time the radio receives the "run" power mode message, it compares the VIN information it has stored to the VIN information received from a module on the class 2 serial data circuit responsible for transmitting that information. If a mis-match occurs, the radio display will indicate to the user the radio is locked. Once this takes place, a DTC will set, the radio will not respond to any button presses and become inoperative. The two scenarios able to cause this condition are:

The only way to unlock the radio is by using a scan tool. Always refer to the table in this section to diagnose the "Theftlock" DTC for further information.

XM is a national satellite radio service that offers up to 100 coast to coast channels including music, news, sports, talk and children's programming. XM provides digital quality audio and text information, including song title and artist name. A service fee is required in order to receive the XM service. For more information, contact XM at www.xmradio.com or call 1-800-852-9696.

Digital Radio Receiver

The radio controls communicate with the digital radio receiver via the class 2 communication circuit. The digital radio receiver sends remote radio audio signals to the radio.

Viewing Messages

Press the DISP or RCL button while in XM mode to view various pieces of information related to the current song or channel. By pressing and releasing the DISP or RCL button, you may view four different categories of information: Artist Name/Feature, Song/Program Title, Channel Category, and other Additional Information that may be broadcast on that channel. Additional Information messages may not always be available. If an Additional Information message is being broadcast on the tuned channel, the INFO icon will appear on the display. Each of the four information types may have multiple pages of text. To reach a category, press and release the DISP or RCL button consecutively until the desired type is displayed. If there are multiple pages of text for the selected information type, the radio will automatically display all the pages for that type at a rate of approximately one page every three seconds before timing out and returning to the default display. You may override this feature by pressing the DISP or RCL button to review all of the pages at your own pace.

The radio is the vehicle chime producer. The chime is audible from the driver's side front door speakers.

To adjust the chime level louder.

1. Turn ON the ignition.
2. Turn OFF the radio.
3. Press and hold preset button 6.

The chime volume level will change from the normal level to loud. The radio displays "LOUD".

To change back to the default or normal setting follow the previous steps. The chime volume level will change from the loud level to normal. The radio displays "NORMAL".

Each time the chime volume is changed, the radio sounds three chimes as an example of the new volume selected.

The radio displays an error when any of the following occurs.

The MP3-capable radio will play both standard audio CDs and CD-Rs. The CD-Rs may contain standard audio format (*.cda) or compressed audio in the *.mp3 format.

Customers who make their own music CD-Rs should be aware of the following:

If these guidelines are not followed, a customer recorded CD may not play. Note that the radio has no ability to record *.mp3 files or any audio to a CD-R, it has only the ability to read information on a CD-R.