GM Service Manual Online
For 1990-2009 cars only

Radio/Audio System Description and Operation Class 2 Radio

Table 1: Radio Features
Table 2: Cassette Features
Table 3: Compact Disc Features

The Entertainment System on this vehicle is configured with either a base or an uplevel system. Both the base and uplevel systems contain a radio, antenna, and speakers.

The uplevel system differs from the base level system by providing the customer with enhanced audio system features. Some of those features may include the radio data system (RDS), extended range speakers, and a remote playback device.

The following list shows the base and uplevel radios available for this vehicle:

    • Base Radio (UM7) - AM/FM
    • Base Radio (UM6) - AM/FM with Cassette
    • Base Radio (U1C) - AM/FM with CD
    • Uplevel Radio (UW3 ) - AM/FM with Cassette
    • Uplevel Radio (UB1) - AM/FM, Cassette and CD
    • Uplevel Radio (UC6) - AM/FM, Integral Multi Disc CD Changer

Radio Features

Controls

Base Radio UM7

Base Radio UM6

Base Radio U1C

Uplevel Radio UW3

Uplevel Radio UB1

Uplevel Radio UC6

Power

Push PWR/VOL knob to turn the radio on.

Push PWR/VOL knob to turn the radio on.

Volume

The volume is adjusted by rotating the PWR/VOL knob.

The volume is adjusted by rotating the PWR/VOL knob.

Automatic Volume Control

N/A

Press the AUTOVOL Button

Tune

Turn the RCL/TUNE knob.

Turn the TUNE/DISP knob

Seek

Momentarily press SEEK/SCAN button

Scan

Hold SEEK/PSCAN button at least 4 seconds

Presets

Six AM and Six FM

Six AM, Six FM1 and Six FM2

Preset Saving

Press and hold desired button until an audible beep is heard

Set Clock

Press and hold the HR or MN button until an audible beep indicates the time set mode has been entered. Once the beep is heard, the time can be set by tapping each button to incrementally adjust the time. Holding down each button will rapidly change the time.

Recall

Push the RCL/TUNE knob.

Push the TUNE/DISP knob

Fade or Balance

Press the AUDIO button to select

Press the PTYPE LIST/AUDIO button to select and adjust both Fade and Balance

Bass, Treble

Press the AUDIO button to select

Press the PTYPE LIST/AUDIO button to select and adjust both Bass and Treble

Automatic Tone

N/A

Press AUTO TONE Button

Cassette Features

Controls

Base Radio UM7

Base Radio UM6

Base Radio U1C

Uplevel Radio UW3

Uplevel Radio UB1

Uplevel Radio UC6

Eject

N/A

Eject button

N/A

EJECT button

N/A

Fast Forward

Preset button 4

Preset button 4

Reverse

Preset button 3

Preset button 3

Auto Reverse

Yes

Yes

Side

Preset button 5

Preset button 5

Previous

Preset button 1

Preset button 1

Next

Preset button 2

Preset button 2

Dolby

N/A

Preset button 6

Repeat

Preset button 6

N/A

Compact Disc Features

Controls

Base Radio UM7

Base Radio UM6

Base Radio U1C

Uplevel Radio UW3

Uplevel Radio UB1

Uplevel Radio UC6

Eject

N/A

N/A

Eject button

N/A

EJECT button

Fast Forward

Preset button 4

Preset button 4

Reverse

Preset button 3

Preset button 3

Disc

CD

Preset button 5

Previous

Preset button 1

Preset button 1

Next

Preset button 2

Preset button 2

Dolby

N/A

Preset button 6

Repeat

Preset button 6

N/A

Random

Preset button 5

Preset button 6

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

    • AM/FM Reception
    • Antenna
    • Audio Amplifier
    • Theft Deterrent
    • Integral Multi Disc CD Changer (IMDX)
    • Remote Playback Device
    • Radio Data System (RDS)
    • Radio Error Messages

AM/FM Reception

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:

    • The power output (wattage) of the broadcasting station
    • The location of the vehicle (or receiver) relative to the broadcast tower.
    • Obstacles between the tower and the receiver
    • Atmospheric conditions
    • What band (AM or FM) the station is broadcasting
    • Type of antenna and the ground plane

AM Reception

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

    • Bend around Obstacles
    • Follow the curvature of the earth
    • May reflect off the ionosphere (skip)

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 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

Antenna

The antenna system is comprised of a fixed mast or a power antenna.

Audio Amplifier

The audio amplifier is standard on some vehicle lines but is optional on most. The radio supplies low level audio signals to the audio amplifier in order to boost the signal sent to the speakers. The amplifier present signal circuit allows the radio to recognize that an amplifier is present. Once the radio detects an audio amplifier, it will output low level audio signals. The audio amplifier on this vehicle is turned on when it receives battery voltage from the radio (when the radio is turned on) via the amplifier control circuit.

Theft Deterrent

The 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 2 scenarios able to cause this condition are:

  1. A radio is installed from another vehicle
  2. 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.

Integral Multi Disc CD Changer (IMDX-Uplevel)

The Integral Multi Disc CD Changer has the capability of storing and playing up to 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.

To operate the Integral Multi Disc CD Changer in the single play mode, depress the "LOAD" button for less than 2 seconds, an audible "beep" can then be heard. When the disc door opens the LED to the right of the disc door will first turn red then green to indicate the CD can be loaded. The radio will also display the message "INSERT CD 1" and the changer will pull the disc into the play position. To operate the changer in the multi disc mode, depress the "MODE" button for more than 2 seconds and the LED to the right of the disc door will first turn red then green to indicate CDs can be loaded. The radio will also display the message "MULTI LOAD" to indicate the multi load mode has been initiated and the changer will begin accepting a disc for however many empty slots there may be. If eight seconds elapse before the next disc is loaded, the multi load mode is cancelled and can be reinitiated if desired by depressing the load button again for more than 2 seconds. If the changer is full, (6 discs are loaded) the single play and multi load modes cannot be executed. When this occurs, 3 audible beeps are heard and the message "CHANGER FULL" is displayed.

Remote Playback Device

The remote playback device is either installed at the factory or in some instances it is dealer installed. There are 3 types of remote playback devices, a multi disc remote CD changer, a single disc CD player and a cassette player. All 3 devices have a wiring harness which plugs into the back of the radio. The radio controls and communicates with the remote playback device through a Entertainment and Comfort (E&C) or Class 2 communication circuit.

Remote CD Changer (CDX)

The remote CD changer allows for multiple compact disks to be played continuously without having to manually change compact discs. Normal size discs may be played using the slots supplied in the magazine. The magazine must first be loaded with discs before it can played. To load CDs, insert the CDs from bottom to top, placing the discs in the magazine label side up. If a disc is loaded label side down, the disc will not play and an error will occur. Care should be used to align and insert the disc into one disc tray only. Repeat this procedure for loading all of the discs in the magazine. Once the discs are loaded into the magazine, push the magazine into the changer in the direction of the arrow marked on the magazine. When the CD magazine is loaded, the changer will begin checking for discs in the magazine. This will continue for up to one and a half minutes, depending on the number of discs loaded. To eject the magazine from the player, push the CD changer door. The door will open. Then press the eject button. NOTICE: If the CD magazine fails to eject after the EJECT button has been pressed, do not attempt to pry the magazine from the CD changer. Whenever a CD magazine with discs is loaded in the changer, the CD changer symbol will appear on the radio display. If the CD changer is checking the magazine for CDs, the CD symbol will flash on the display until the changer is ready to play.

Radio Data System (RDS)

All uplevel audio systems are equipped with technology known as the Radio Data System (RDS). RDS is a system that sends data along with the audio of the FM station you are currently tuned to. RDS is a standard that defines how a FM broadcast station may send digital data along with the audio program. Think of it as a one way wireless modem, allowing the broadcaster to send information about his program to your receiver.

RDS data is carried in what is known as a "sub-carrier". A sub-carrier is a frequency that the FM broadcaster is authorized to use to send data or other audio programs that are not audible in the main audio program. RDS information can be used to display program information and to control the radio.

To receive the RDS signal, all that is needed is an FM receiver with a RDS circuit. A special integrated circuit capable of dealing with the RDS signal is in the RDS circuit and passes it along to the receiver's microprocessor where it is decoded and acted upon.

RDS Basic Information

    • RDS functions are provided in the FM broadcast band only.
    • RDS functions will only work with FM broadcast stations that are broadcasting RDS data.
    • Not all FM Broadcast stations broadcast RDS data or offer all of the RDS services.
    • RDS functions may not work properly when reception is weak, reception is of poor quality, or RDS is not implemented properly by the FM Broadcaster.

In some cases, a radio station broadcasting incorrect information may cause the RDS features of the radio to appear to work improperly.

Broadcast RDS information can be used in a variety of ways by the receiver and listener, but basically falls into 2 categories: Display and Control.

Displaying Program Information

RDS displays textual information such as:

    • The name of the station
    • The type of program
    • General information such as artist and song title, call in phone numbers, etc

RDS is always on. When tuned to a non-RDS station, your radio will display frequency information as you would normally expect. When tuned to a RDS station, your radio will change from displaying the frequency of the FM station to displaying the call letters of the station or display the nickname of the station. This feature is known as the Program Service Name.

Controlling the Radio

RDS can control the radio when data the receiver can use responds to timely information performing the following:

    • Interrupt the playback of your cassette or CD for traffic or emergency bulletins.
    • Search for stations by type of program.
    • Automatically follow networked programming from transmitter to transmitter as you travel from one listening area to another.
    • Set your clock to the time that the RDS Broadcast station broadcasts.

Viewing and Selecting RDS Information for Display

Press the "TUNE/DISP" knob once for less then 2 seconds when the radio displays the program service name and the frequency of the station will be displayed. Press the knob again, and the program type (P-Type) will be displayed. Pressed again, and the program type name will be displayed (if the broadcaster is broadcasting one). The program type name is an eight-character name that the broadcaster may use to further identify the type of programming currently being broadcast. Should you decide that Frequency, P-Type or program type name is more desirable to display when tuned to an RDS station than the Program Service Name, press the "TUNE/DISP" knob until the desired information is displayed, then press and hold for more than 2 seconds. A beep should be heard and the radio will now display the selected information whenever tuned to an RDS broadcaster. The radio will display frequency for all non-RDS broadcast stations.

Using the RDS Traffic Feature

Some RDS broadcasters may carry traffic information programming to inform you of current traffic conditions in your listening area and is indicated by the icon in the radio display. RDS enables the broadcaster to get this information to you even when you are listening to a tape or compact disc. This feature can be enabled or disabled by the listener. Press the "TRAF" button to find a station that claims to carry traffic information. You may do this even when playing a cassette tape or compact disc. This action will operate in the background without interrupting the current playback. If the radio is not currently tuned to an RDS traffic station, the radio will immediately SEEK an RDS traffic station. If the radio finds an RDS traffic station, the" TRAF" icon will appear in the radio display as will brackets around the (TRAF) icon. If the radio cannot find an RDS traffic station after searching through the entire FM band, the radio will display "NO TRAFFIC".

Alternate Frequency (AF) Switching

RDS permits broadcaster's to send information to the radio that allows the radio to automatically switch frequency to the best quality station in that broadcaster's network.

Since the radio is displaying the broadcaster call letters or nickname, the listener will not see the frequency during an AF switch unless you have changed the default display to be frequency instead of Program Service name.

To enable or disable AF switching perform the following:

    • Press and hold the AM/FM button for 2 seconds or more.
    • The radio will display AF ON or AF OFF depending on the current condition of AF and a confirmation beep will be heard.

When AF is enabled and you recall a RDS station stored on preset, the radio determines if the station stored is of acceptable quality. If not, the radio checks all available AF's for your station. If the radio fails to locate your program, AF SEARCH will be displayed as the radio scans across the band looking for your program or an affiliated network. If the radio cannot find the original station or an acceptable alternate frequency NOT FOUND will be displayed and the radio returns to the original frequency for the preset.

RDS Clock Time

Broadcasters can choose to send clock time information in the RDS data. This information can be used to update the clock time on the radio. RDS clock time is broadcasted once a minute. To set the clock using RDS clock data perform the following:

    • Press and hold the HR and MIN buttons together for 2 or more seconds to update the time.
    • The display will show UPDATED after receiving the broadcasted time data.
    • If the broadcaster is not broadcasting the time data, the radio will display NO UPDATE and the time remains unchanged.

Radio Error Messages

The radio displays the following errors:

CDX ERR: Displays if communication is lost with the remote CD changer, if equipped.

CHECK CD: Displays when the player encounters a focus or tracking error.

CHK CDXX: Displays when the CD changer encounters a focus or tracking error, if equipped.

CHK TAPE: Displays if a tape has been inserted but is unable to be played due to an error.

DOOR OPEN: Displays when the CD changer door has been left open, if equipped.

NO DISC: Displays when the radio expected a disc to be inserted.

NONE: Displays when the radio is unable to detect the vehicle speed data information via the class 2 serial data circuit.