Silhouette FWD V6-3.4L VIN E (2004)
The AM frequencies have longer range due to the ground wave. The ground wave follows the curvature of the earth and is effected 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 miles).
FM Reception
The shorter wavelengths of the higher frequency FM band:
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Reflect off obstacles
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Are absorbed by the ground
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Penetrate the ionosphere
Broadcasts in the FM band are limited to "line of sight" reception which is typically 40 km (25 miles). 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:
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Height of the broadcast antenna
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Height of the receiving antenna
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Terrain and buildings in the broadcast path
XM Reception
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 is comprised of a very thin metal grid which is permanently affixed to the top center of the windshield. If the antenna becomes damaged,
the windshield must be replaced.
Theft Deterrent
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:
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A radio is installed from another vehicle
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A module which communicates on the class 2 serial data circuit which supplies VIN information to the radio is replaced and not properly setup
with the correct VIN information for that vehicle
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.
Digital Radio
The digital radio receiver utilizes class 2 serial data to determine if it is in the appropriate vehicle. Each time the digital radio receiver receives the
"run" power mode message, it compares the VIN information received from the body control module (BCM) on the class 2 serial data circuit. If a
mis-match occurs, the radio display will indicate to the user the digital radio receiver is locked. The digital radio receiver cannot be unlocked, it must
be replaced. The two scenarios able to cause this condition are:
1. A digital radio receiver is installed from another vehicle.
2. The BCM is replaced and not properly setup with the correct VIN information for that vehicle.
Integral Multi Disc CD Changer (IMDX [Uplevel])
The Integral Multi Disc CD Changer has the capability of storing and playing up to six (6) compact discs. The Integral Multi Disc CD Changer has a
shock-absorbing system. Only under extreme operating temperatures or severe shock or vibration should the compact disc player skip or mute. If the
customer travels an abnormally rough road, a skip condition may be normal. Test drive the vehicle on a normal road with a known good CD. If the
condition is still present, replace the radio.
The use of CD lens cleaner discs is not advised, due to the risk of contaminating the lens of the CD optics with lubricants internal to the CD
mechanism.
Single Disc Loading
To operate the Integral Multi Disc CD Changer in the single play mode, press and release the LOAD button and wait for the LED to the right of
the disc door to turn green. Load a disc when the LED turns green. If the radio is on, the disc will begin to play automatically. If the radio is off,
press the LOAD button for the disc to play.
Multi Disc Loading
To operate the Multi Disc CD Changer in the multi disc mode, press and hold the LOAD button for two seconds. An audible beep will be heard
and the LED to the right of the disc door begins to flash. The radio will also display the message "INSERT CD". When the LED stops flashing and
