Chevrolet Silverado / GMC Sierra. Service manual — part 2253

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:

Reflect off obstacles

Are absorbed by the ground

Penetrate the ionosphere

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:

Height of the broadcast antenna

Height of the receiving antenna

Terrain and buildings in the broadcast path

XM Reception

XM satellite radio provides digital radio reception. The XM signal is broadcast from 2 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.

XM Satellite Radio

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 serial data communication
circuit. The digital radio receiver sends remote radio audio signals to the radio.

Viewing Messages

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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.

Technical Information for the MP3/CD Radios (US8, US9 and UVA)

The US8 and US9 radios will play both standard audio CDs and CD-Rs or CD-RWs. The CD-
R/RWs may contain either standard audio (*.cda) or compressed audio (*.mp3). Customers who
record their own music CD-R/RWs should be aware of the following:

The files can be recorded on a CD-R/RW disc with a maximum capacity of 700 MB.

XM Advisory Messages

Condition

Updating

Updating encryption code

No Signal

Loss of signal

Loading XM

Acquiring channel audio (after 4 second

delay)

CH Off Air

Channel not in service

CH Unavail

Channel no longer available

No Info

Artist Name/Feature not available

No Info

Song/Program Title not available

No Info

Category name not available

Not Found

No channel available for the chosen category

No Info

No text/informational message available

XM Locked

Theft Lock active

Radio ID

Electronic serial number (ESN) channel 0

Unknown

Radio ID not known (should only be if

hardware failure)

Chk XMRcvr

Hardware failure

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The radio will play only compressed audio files recorded in the *.mp3 format. It also
supports playlists that can be made and saved with popular MP3 software (in the *.m3u
format). A playlist name must be no more than 32 characters in length. If the name of a
playlist is longer than 32 characters, the radio will ignore the playlist.

The radio will only play audio from a CD-R/RW, it cannot record audio.

The radio will play a mixed mode CD-R/RW (one recorded with both *.cda and *.mp3
files). If a mixed mode CD is inserted in the radio, the radio will assign the standard CD
audio to a directory which is listed as ROM audio directory.

The radio supports multi-session discs, but only the files from the last session will be played.

There are a total of 20 directories (folders) allowed on a disc. The file structure can be 0-4
directories deep (a folder within a folder, within a folder, etc). Anything more than 20
directories will be ignored. Each directory may have up to 99 files contained within it. Files
not having the *.mp3 extension will not be played, but still count toward the maximum.
Anything more than the first 99 files within a directory will be ignored. A single disc may
have up to 254 files and directories. Anything beyond the 254 limit will be ignored.

MP3 files must be written to a CD-R/RW in one of the following industry-standard formats:

ISO 9660 Level 1

ISO 9660 Level 2

Joliet

Romeo

ID3 tag information is displayed by the radio, if available. The ID3 tag information can
either be version 1 or 2. The radio will display the filename, song name, artist name, album
name, directory name, and playlist name, etc.

If the customer does not follow these guidelines when recording a CD-R/RW, the disc may not
play in the US8 or US9 radio.

VIDEO ENTERTAINMENT SYSTEM DESCRIPTION AND OPERATION

Display Screen

The rear display screen shows video from either DVD movies, or an AUX input device, such as a
video game console or camera. Each video screen has a dedicated video signal circuit to the
radio.

AUX Inputs

The AUX input jacks are standard color-coded RCA-style jacks. Video is yellow, right audio is
red, and left audio is white. The jacks are located on the rear of the center console. A number of

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devices may be plugged into the AUX jacks, including, but not limited to video game consoles,
digital cameras, camcorders, or other devices. Audio only sources can be played through the
AUX jacks from portable audio devices. Turn on the rear seat audio (RSA), press the SOURCE
key repeatedly until AUX is selected or touch the AUX screen button. An auxiliary device must
be connected for the AUX screen button to appear as an option to select on the radio.

Rear Seat Audio (RSA)

The rear seat audio (RSA) is integrated into the rear HVAC control module. Audio, video source
are controlled by the radio through serial data communication. The rear speaker channels pass
through the RSA. The rear seat audio can be muted by the RSA when in use. The rear seat
entertainment (RSE) system includes a radio with a DVD player, a video display screen, 2
wireless headphones, and a remote control. Vehicles equipped with a third row video display will
include 3 wireless headphones.

Wireless Headphones

Wireless headphones are optional and allow for rear seat passengers to use the rear seat
entertainment (RSE) or rear seat audio (RSA) functions without disturbing the listening of front
seat passengers. The wireless headphones receive audio signals from the infrared (IR) transmitters
on the overhead console. This transmission is line of sight only, so audio quality will be degraded
if anything blocks the transmitter signal from reaching the headphones.

The wireless headphones include 2 channels. This allows rear seat passengers to utilize both RSE
and RSA functions without disturbing one another. The toggle switch on the right side headphone
earpiece switches between channel one and channel 2. RSE is broadcast on channel one, and
RSA on channel 2.

To use wireless headphones, turn them on using the power button on the left side headphone
earpiece. Adjust volume using the rotary dial on the right side headphone earpiece.

Wired Headphone Jacks

The overhead console is equipped with two 2.5 mm jacks for wired headphones. The headphones
can be used to listen to either the rear seat entertainment (RSE) or rear seat audio (RSA)
functions. If both RSE and RSA are used at the same time, the wired headphones receive only
RSA audio.

To use the wired headphones, plug the headphones into the jacks. Adjust the volume by pressing
the headphone button on the left or right side of the RSA face, and then using the FWD or REV
buttons to adjust the volume up or down. Visual indicators on the RSA display will indicate
volume level. The left headphone button selects the left headphone jack for adjustment, and the

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