GM Service Manual Online
For 1990-2009 cars only

The Radio/Audio System consists of 1 of 3 levels of audio entertainment:

    • Base Level
    • Uplevel
    • Luxury Level

All 3 levels of audio entertainment contain a speaker system that is appropriate for each radio/audio level and a choice of radios that contain various options.

Radio/Audio System Content

Base Level Audio System

Uplevel Audio System

Luxury Audio System

UM7 Radio with AM/FM Stereo

UM6 Radio with AM/FM Stereo and Auto-Reverse Cassette

UL0/UP0 Radio with AM/FM Stereo and Auto-Reverse Cassette. UP0 includes a single CD Remote Playback Device

UN0 Radio with AM/FM Stereo and CD Player

UL1 Radio with AM/FM Stereo and Auto-Reverse Cassette

Fixed Mast Antenna

Fixed Mast Antenna

Fixed Mast Antenna

Fixed Mast Antenna

Fixed Mast or Diversity Antenna

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Optional Remote Playback Device- CD Changer

Optional Remote Playback Device- CD Changer

Remote Playback Device - In-dash CD Changer

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Audio Amplifier-Utilities/Suburban Only

Audio Amplifier-Utilities/Suburban Only

BOSE Audio Amplifier

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Optional Rear Seat Audio Controller

Optional Rear Seat Audio Controller

Rear Seat Audio Controller

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Steering Wheel Controls

Playing the Radio (Base Level)

VOLUME-BAL

    • The ignition switch must be in the ACCESSORY or RUN position to operate the radio.
    • The radio power switch is integral with the volume control.
    • Use the radio power switch/volume control knob in order to turn the system ON and OFF and to control the volume.
    •  Turn the radio power switch clockwise in order to turn the system ON or to increase the volume.
    • Turn the radio power switch counterclockwise in order to turn the system OFF or to decrease the volume.

RECALL

    • The RECALL function can only be performed with the radio ON.
    • Press the volume control knob to toggle the display between the time of day or the radio frequency.
    • Press the volume control knob to briefly display the time of day while the radio is turned OFF.

Finding a Station (Base Level)

AM-FM

Press the tune knob in order to change the radio band between AM and FM. The display will indicate the current band and the last radio frequency that was selected on that band.

TUNE

    • Rotate the TUNE knob clockwise in order to increase the AM or FM frequency.
    • Rotate the TUNE knob counterclockwise in order to decrease the AM or FM frequency.

SEEK

    • Press the right arrow button in order to tune into the next station higher in frequency.
    • Press the left arrow button in order to tune into the next station lower in frequency.

SCAN

  1. Press both SEEK buttons in order to activate the SCAN mode.
  2. SCAN will appear on the display and the radio will stop at every station for a few seconds.
  3. Press the right arrow button in order to tune into the next higher station
  4. Press the left arrow button in order to tune into the next lower station.
  5. Press VOLUME or both SEEK buttons to stop scanning.

PUSH BUTTONS

Up to 14 stations can be preset into the radio's memory using the numbered push buttons (1,3,5, and 7). In order to preset 4 AM and 4 FM stations, perform the following steps:

  1. Tune to the desired radio station.
  2. Press the SET push button. SET will appear on the display.
  3. Press and hold a numbered push button until the SET display goes off. The radio will tune to the preset station the next time the same push button is pressed.

In order to preset 3 additional AM and 3 additional FM stations perform the following steps:

  1. Tune to the desired radio station.
  2. Press the SET push button. SET will appear on the display.
  3. Press and hold two adjacent push buttons (1 and 3) until the SET display goes off. The radio will tune to the preset station the next time both push buttons are pressed.
  4. Repeat the first 2 steps for each remaining pair of push buttons (3 and 5, or 5 and 7).

Diversity Antenna System

Important: This diversity antenna system is comprised of 3 glass mounted antennas, a radio antenna module, and an FM impedance matching module. The primary AM and FM antennas are an integral part of the right rear quarter glass and are connected to the radio antenna module. The secondary FM antenna is an integral part of the left rear quarter glass and is connected to the FM impedance matching module. The radio antenna module, located in the headliner above the right rear quarter glass, processes the antenna reception signals and phase aligns them to create one strong signal. The FM impedance matching module, located in the headliner above the left rear quarter glass, boosts the secondary antenna signal and transmits it to the radio antenna module.

The following information lists the most probable cause of the concern to the least probable cause followed by the appropriate test for that condition. If the test leads to the replacement of a component, always inspect for a poor connection before proceeding with the replacement. If the test leads to the replacement of a component, always inspect for a poor connection before proceeding with the replacement. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Perform the Antenna System Test and test the antenna coax cable prior to performing any of the following tests.

Poor Reception on Both AM and FM Bands

    • The radio antenna module is not grounded properly. The module grounding screws should be clean and tight. The antenna module ground is either a chassis ground or a ground strap. Measure the resistance from the antenna module base plate to a good ground. Resistance should be 0.20 ohms or less. Find and correct the condition if the resistance is out of specification.
    • The antenna enable signal is not present at the radio antenna module. This could be caused by an output failure of the radio or an open/shorted antenna enable signal circuit. In order to test the antenna enable signal circuit, the radio must be ON and tuned to the FM band. Disconnect the radio antenna module. Measure the voltage from the antenna enable signal circuit of the radio antenna module to a good ground. Voltage measured should be near 12 V. If the specified voltage is measured, test the antenna enable signal circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. If no failures were found, replace the radio. Refer to Radio Replacement for service procedure.
    • The FM composite signal circuit to the radio antenna module is open or shorted to ground. Test the FM composite signal circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
    • The feed coax at the radio antenna module has been inadvertently swapped with the FM impedance matching module crossover coax. Ensure that the feed coax, marked with a yellow band, is in the correct socket on the radio antenna.
    • Improper retention of the antenna cable in the floating retainer. Poor or no connection with the radio will result when the radio is installed if the antenna cable is not properly attached in the floating retainer. Inspect the antenna cable for movement in the floating retainer. Replace the antenna cable if movement is found.
    • Defective radio antenna module. Replace radio antenna module. Refer to Radio Control Module Replacement for service procedure.

Poor Reception on AM Band Only

    • Defective AM antenna.
    • Defective radio antenna module. Replace radio antenna module. Refer to Radio Control Module Replacement for service procedure.

Poor Reception on FM Band Only

    • Defective primary or secondary FM antenna
    • Defective radio antenna module. Replace radio antenna module. Refer to Radio Control Module Replacement for service procedure.
    • Defective FM impedance matching module. Replace FM impedance matching module. Refer to Radio Control Module Replacement for service procedure.

Setting the Tone (Base Level)

BASS

    • Slide the BASS lever up in order to increase the bass response.
    • Adjust the BASS lever down in order to decrease the bass response.

TREB

    •  Slide the TREB level up in order to increase the treble response.
    • Slide the TREB lever down in order to reduce the noise if the station is weak or noisy.

Adjusting the Speakers (Base Level)

BAL

    • Turn the BAL control knob behind the VOLUME knob to select more or less sound, distributed between the left or the right speakers.
    • The middle position will deliver an equal balance of sound between the left and right speakers.

FADE

    • Turn the FADE control knob behind the TUNE knob to select more or less sound, distributed between the front and rear speakers.
    • The middle position will deliver an equal balance of sound between the front and rear speakers.

Playing a Cassette Tape (Base Level)

  1. In order to play a tape, the ignition switch must be in the ACCESSORY or RUN position and the receiver must be turned ON.
  2. Tapes are end-loaded into the cassette player.

  3. Insert the tape squarely through the door, exposed tape side of the cassette facing to the right.
  4. When the tape is fully inserted, the AM/FM portion of the radio will turn off and the tape will begin playing.
  5. The tape player works best with tapes that are 30-45 minutes long on each side.
  6. Longer running tapes may not work well in these players because they are usually too thin.

  7. Once the tape is playing, the volume, balance and fade knobs operate the same as with the radio.
  8. An arrow indicates which side of the tape is being played.

FWD

  1. Press the SEEK right arrow key in order to fast forward the tape.
  2. Press the SEEK left arrow key in order to stop the fast forward operation.

REV

  1. Press the SEEK left arrow key in order to rewind the tape.
  2. Press the SEEK right arrow key in order to stop rewinding the tape.

RECALL

Press the volume control knob to change from one side of the tape to the other.

EJECT

Press the EJECT push button in order to remove the tape or in order to stop the tape and switch to the radio.

CLN

  1. If CLN appears on the display, the cassette player needs to be cleaned in order to prevent damage to the tape player.
  2. After cleaning the tape player, press and hold the EJECT button for 5 seconds in order to reset the CLN indicator.
  3. The radio displays "- - -" in order to show that the indicator has been reset.

Playing the Radio (Uplevel/Luxury)

PWR-VOL

    • Push the PWR-VOL knob in order to turn the radio ON and OFF.
    • Rotate the volume control clockwise in order to increase the volume.
    • Rotate the volume control counterclockwise in order to decrease the volume.

RECALL

    • The RECALL function can only be performed with the radio ON.
    • Press the RECALL push button to toggle the display between the time of day or the radio frequency.
    • Press the RECALL push button to briefly display the time of day while the radio is turned OFF.

Speed Compensated Volume (SCV)

    • In order to use the SCV, adjust the volume to the listening level you want and move the control ring behind the PWR-VOL knob to adjust the SCV.
    • The volume level automatically adjusts to compensate for road and wind noise as you drive.
    •  As you drive, the volume level will change in order to compensate for the noise present at any particular speed.
    • Each detente on the SCV allows for more compensation at a faster rate.

Finding a Station (Uplevel/Luxury)

AM-FM

    • Press the AM/FM push-button to switch between AM, FM1, and FM2.
    • The display indicates the current band.

TUNE

  1. Press lightly on the TUNE control in order to release the tune control from the tune control's recessed position.
  2. Rotate the TUNE knob to the right in order to increase the frequency.
  3. Rotate the TUNE knob to the left in order to decrease the frequency.
  4. Push the TUNE control back in order to store the frequency setting while not tuning.

SEEK

    • Press the right arrow key in order to tune into the next higher frequency.
    • Press the left arrow key in order to tune into the next lower frequency.
        Audio is muted during the SEEK operation.

SCAN

  1. Press and hold SEEK for 2 seconds. SCAN will appear on the display.
  2. Use SCAN in order to listen to each radio station for a few seconds.
  3. Press SEEK again in order to stop scanning.

PUSH BUTTONS

Up to 18 stations (6 AM, 6 FM1, and 6 FM2) can be preset into the radio's memory using the 6 numbered push buttons. In order to preset a station in memory, perform the following steps:

  1. Press AM-FM in order to select the band.
  2. Tune to the desired station, using the TUNE knob or SEEK.
  3. Press AUTO TONE in order to select the setting that you prefer.
  4. Press and hold 1 of the 6 push buttons until audio returns (approximately 2 seconds).
  5. Whenever you press that push button, the preset station will return.
  6. The AUTO TONE that you selected will also be automatically selected for that push button.

PSCAN

Any stations already stored in preset memory can be sampled by the PSCAN mode.

  1. In order to use PSCAN, press the PSCAN push button.
  2. PSCAN will scan each of the presets and stop for a few seconds.

  3. Press PSCAN or another push-button in order to stop scanning to listen to a specific station.
  4. PSCAN appears in the display whenever the tuner is in the PSCAN mode.

    If 1 of the stations stored on a push-button is weak, the radio display shows the channel number (P1-P6) for several seconds before advancing to the next preset station.

Setting the Tone (Uplevel/Luxury)

AUTO TONE

The automatic tone control (ATC) feature tailors the equalization to the type of broadcast being received.

  1. Press AUTO TONE in order to step through the 6 preset equalization settings of CLASSIC, NEWS, ROCK, POP, JAZZ, or C/W (Country Western).
  2. Note the graph and words in the display for each press of the push button.

  3. One or more presses of the AUTO TONE push-button brings up manual (MAN) and return the control of tone back to the TREB and BASS controls.
  4. Any time that a BASS or TREBLE control rotates, the tone automatically sets to MAN.

BASS

  1. Depress the BASS control in order to remove the control from the recessed position.
  2. Rotate the BASS control to the right in order to increase the bass response.
  3. Rotate the BASS control to the left in order to decrease the bass response.
  4. Operation of this control will switch the radio's AUTO TONE feature to MAN.
  5. Push the control knob back in to store when not in use.

TREBLE

  1. Depress the TREB control in order to remove the control from the recessed position.
  2. Pull the TREB control out to a fully extended position in order to make TREB adjustments.
  3. Rotate the TREB control to the right in order to increase the treble response.
  4. Rotate the TREB control to the left in order to decrease the treble response.
  5. Operation of this control will switch the radio's AUTO TONE feature to MAN.
  6. Push the control knob back in to store when not in use.

Adjusting the Speakers (Uplevel/Luxury)

BALANCE

  1. Depress the BAL control in order to remove the control from the recessed position.
  2. Rotate the balance to the right in order to adjust the sound to the right speakers.
  3. Rotate the balance to the left in order to adjust the sound to the left speakers.
  4. Push the control knob back in to store when not in use.

FADE

  1. Depress the FADE control in order to remove the control from the recessed position.
  2. Rotate the FADE control knob to the right in order to adjust the sound to the front speakers.
  3. Rotate the FADE control knob to the left in order to adjust the sound to the rear speakers.
  4. Push the control knob back in order to store when not in use.

Playing a Cassette Tape (Uplevel/Luxury)

  1. Tapes may be played with the ignition ON or OFF.
  2. If the ignition is ON but the radio is OFF, the tape will begin playing.

    A tape symbol, accompanied by tape direction arrows, is shown in the center of the graphic display whenever a tape is playing.

  3. Tapes are end-loaded into these players. Insert the tape squarely through the door, exposed tape side of the cassette facing the right.
  4. When the tape is fully inserted, the AM/FM portion of the radio will turn OFF and the tape will begin playing.
  5. The tape player works best with tapes that are 30 to 45 minutes long on each side. Longer tapes may not work well in the cassette player because the tapes are so thin.
  6. To load a cassette with the ignition in the OFF position, press EJECT or RECALL.
  7. Insert the cassette.
  8. If the ignition is in the ON position and the radio is in the OFF position, the tape will begin to play.
  9. The player automatically senses the tape cartridge for metal or Cr02 tape media and presets the pre-emphasis.
  10. For metal tapes, "DD" will be displayed.

  11. Any time a tape is playing, use the volume, balance, fade, treble, and bass just as with the radio.
  12. An arrow indicates which side of the tape is being played.

  13. When you insert a tape, the top of the cassette plays first.

PREV

    • Press the PREV or the SEEK left arrow push button in order to search for the previous selection.
        The tape direction arrow blinks during SEEK operation.
    •  A minimum 3 second blank gap is required for proper operation.
    • Audio is muted during SEEK.

PROG

Press the PROG push button in order to switch from one side of the tape to the other.

NEXT

    • Press the NEXT or the SEEK right arrow push button in order to search for the next selection.
    • A minimum of a 3 second gap is required for the player to stop at the beginning of a selection.
    • The tape direction arrow will blink during the SEEK operation.

REV

    • Press REV in order to rewind the tape. The tape rapidly reverses to the beginning of the cassette or until you press the REV push-button a second time.
        The radio plays the last selected station during the REV operation.
    • The tape direction arrow blinks during REV operation.

DOLBY®

Dolby Noise Reduction is manufactured under a license from Dolby Laboratories Licensing Corporation. Dolby® and the "DD" symbol are trademarks of Dolby Laboratories Licensing Corporation.

  1. Press the Dolby push-button in order to reduce cassette tape noise.
  2. The "DD" Dolby® symbol will appear in the display.

FWD

  1. Press FWD in order to fast-forward the tape. The tape rapidly advances to the end of the tape or until you press the FWD push-button again.
  2. The radio will play the last selected station during the FWD operation.
  3. The tape direction arrow blinks during FWD operation.

AM-FM

Press the AM-FM button in order to switch from tape to radio.

TAPE AUX

  1. Press TAPE AUX in order to return to the tape player.
  2. The lighted arrow appears and shows the direction of play when a tape is in the active mode.

EJECT

  1. In order to remove the tape, press EJECT.
  2. EJECT may be activated with either the ignition or the radio OFF.
  3. Cassettes may be loaded with the radio OFF by pressing EJECT before loading the cassette tape.

CLN

  1. If CLN appears on the display, the cassette player needs to be cleaned in order to prevent damage to the tape player.
  2. After cleaning the tape player, press and hold EJECT for 5 seconds in order to reset the CLN indicator.
  3. The radio displays "- - -" in order to show that the indicator reset.

Playing a Compact Disc (Uplevel/Luxury)

PWR

  1. Press the PWR knob in order to turn the system on.
  2. The system can be turned on by inserting a compact disc into the player with the ignition in the ON position.
  3. Insert a disc partway into the slot, label side up.
  4. The player pulls the disc in.
  5. When inserted, the disc will begin playing track 1.
  6. Wait a few seconds until the disc plays.
  7. The letters "CD" and a CD symbol appears on the display.
  8. If the disc comes back out and ERR appears on the display, inspect for the following conditions:
  9. • The disc is upside down.
    • The disc is dirty, scratched, or wet.
    • There is too much moisture in the air.
    • Wait an hour and try again.
    • The vehicle is operating on a very rough road.
    • The disc player is very hot.
  10. Press RECALL in order to eliminate the ERR message.

RECALL

  1. Press the RECALL button in order to see what track is playing.
  2. Press the RECALL button again within 5 seconds in order to see the elapsed time of the current track.
  3. The track number appears when a new track begins to play.
  4. Press RECALL again in order to return to the time display.

PREV

  1. Press PREV or the SEEK left arrow in order to search for the previous selection.
  2. If you hold the PREV button or press it more than once, the disc advances further.

RDM

  1. The random playback (RDM) feature allows the tracks on the compact disc to be played in random order rather than in sequential order.
  2. During random playback, a RANDOM indicator appears in the display.
  3. Press RDM again in order to return to normal play.

NEXT

  1. Press NEXT or the SEEK right arrow in order to search for the next selection.
  2. If you hold the NEXT button or press it more than once, the disc will advance further.
  3. The next track number will appears on the display.

REV

  1. Press and hold the REV button in order to quickly reverse within a track.
  2. When the CD reverses, elapsed time displays in order to find the correct passage.

FWD

  1. Press and hold the FWD button in order to quickly advance within a track.
  2. When the CD advances, elapsed time displays in order to find the correct passage.

AM-FM

  1. While in the CD mode, press the AM-FM button in order to stop playing the CD and play the radio.
  2. The CD symbol will still be displayed but the letters CD are replaced with AM, FM1, or FM2.
  3. If the radio is turned OFF, the disc will remain in the player and resume playing at the point where it stopped, when the radio is turned ON.

CD AUX

  1. Press the CD AUX button in order to return from listening to the radio and play the CD.
  2. When a disc plays, the letters "CD" and the CD symbol will appear on the display.
  3. If the radio is turned OFF, the disc will remain in the player and resume playing at the point where it stopped, when the radio is turned ON.

EJECT

    • Press EJECT in order to eject the disc from the CD player.
    • A disc that has been ejected but not removed from the player will be pulled back in within 30 seconds.
    • This protects the disc and the player from damage.
    • The disc does not play.
    • In order to remove the disc, press the EJECT button and remove the disc from the player.

Remote Playback Device-- CD Player (Uplevel/Luxury)

In order to operate the Compact Disc player, perform the following steps:

  1. Insert a disk part way into the slot, label side up.
  2. If the radio is in the OFF position and the ignition is in the ON position when you insert the CD, the radio turns on and begins playing the CD.
  3. In order to load a CD with the ignition in the OFF position, press the EJECT button on the remote player and insert the disc.
  4. In order to remove the disc, press the EJECT button and remove the disc.
  5. All of the compact disc functions are controlled by the radio buttons except EJECT.
  6. When a disc is in the player, a CD symbol appears next to the CD symbol in the bottom left corner on the display.
  7. The track number will also be displayed .

  8. If the disc comes back out and ERR appears on the display, inspect for the following conditions:
  9. • An upside down disc
    • A dirty, scratched, or wet disc
    • Too much moisture in the air
    • If there is too much moisture in the air, wait about 1 hour and try again.
    • The vehicle is operating on a very rough road.

TAPE AUX

  1. With a disc loaded in the player and the radio playing, press the TAPE AUX button once in order to play the compact disc.
  2. Press AM-FM in order to return to the radio.
  3. If you load both a cassette and a CD, press TAPE AUX in order to switch between the tape and the compact disc.

SEEK

  1. Press the left arrow while playing a CD in order to go back to the beginning of the current track.
  2. The CD goes back to the current track if more than 8 seconds have played.
  3. Press the left arrow again in order to go to the previous tracks.
  4. Press the right arrow in order to go to the next higher track on the disc.

PREV

  1. Press PREV in order to go back to the beginning of a current track.
  2. The CD goes back to the current track after 8 seconds have played.
  3. Press PREV again in order to go the previous track on the disc.

PROG

The PROG button functions only when the vehicle is equipped with a 12-disc changer.

NEXT

Press the NEXT button in order to advance to the next track on the disc.

REV

  1. Press and hold the REV button in order to quickly reverse within a track.
  2. When the CD reverses, elapsed time displays in order to find the correct passage.

FWD

  1. Press and hold the FWD button in order to advance within a track.
  2. When the CD advances, elapsed time displays in order to find the correct passage.

RANDOM

  1. Press PSCAN in order to enter the RANDOM play mode.
  2. RANDOM will appear on the display.

  3. While in this mode, the tracks on the disc will be played in random order.
  4. If you press the SEEK, PREV, or NEXT buttons while in the random mode, the PREV or NEXT track scans randomly.
  5. Press PSCAN again in order to turn off RANDOM and return to normal operation.

EJECT

    • Press EJECT in order to eject the disc from the CD player.
    • A disc that has been ejected but not removed from the player will be pulled back in within 30 seconds.
        This protects the disc and the player from damage.
    • The disc does not play.
    • In order to remove the disc, press the EJECT button and remove the disc from the player.

RECALL

  1. Press RECALL in order to see what track is playing.
  2. Press RECALL again within 5 seconds in order to view elapsed time.
  3. Press RECALL a third time and the time of day will be displayed.

Remote Playback Device-- In-dash CD Changer (Luxury)

The compact disc changer plays up to six standard size CDs continuously. Individual CDs may be loaded or ejected into or from any position. A green light on each numbered button indicates a CD is loaded in the respective position. An amber light on a numbered button indicates that a CD is playing. When loading CDs, the loading slot indicators turn amber to indicate that the player is ready to accept a CD. CDs can be loaded or ejected with the radio or the ignition being on or off.

Loading a Single CD

Use the following steps to load a single CD into the CD Changer:

  1. Press the LOAD button. Available positions will blink amber.
  2. Select a position by pressing the desired numbered button with the amber blinking light. If a button is not pressed within five seconds, the changer will go to the lowest available position.
  3. Load the CD when the loading slot indicators turn amber. An internal door will open allowing a single CD to be inserted into the changer. After approximately ten seconds the changer will be ready to play.

Loading Multiple CDs

Use the following steps to load multiple CDs into the CD Changer:

  1. Press and hold the LOAD button. The first CD will be loaded into the lowest numbered empty position.
  2. Load a single CD when the loading slot indicators turn amber. After about ten seconds the changer will cycle to the next available position.
  3. Repeat Step 2 until all CDs are loaded in to all of the desired positions. If you do not wish to load all of the positions, you can cancel the load all function by pressing a button with a green flashing indicator light or wait 20 seconds for the changer to time out.

Ejecting CDs

  1. To eject all CDs, Press and hold the eject button. To eject selected CDs, press the eject button. The buttons with loaded CDs will blink amber.
  2. Press one of the amber blinking buttons to select the location of the CD you want to eject. The changer will move to that location and eject the CD. If you do not remove the CD from the player within ten seconds, it will be reloaded. If the eject button is pressed and a numbered location button is not pressed within five seconds, the current or last played CD will be ejected.

Playing the Remote Playback Device- In-dash CD Changer

  1. Press the desired numbered button with a green indicator light.
  2. Press the CD TAPE button on the radio. The CD changer will go to its last played position.

PREV

Press this button or the SEEK left arrow to go to the previous track if the current selection has been playing for less than eight seconds. If the PREV button is pressed and the current selection has been playing for more than eight seconds, it will go to the beginning of the current selection. If you hold or press this button more than once, the player will continue moving back through the CD. The sound will mute while seeking.

PROG

Press this button to select a CD. The CD number and track number will be displayed.

NEXT

Press this button or the SEEK right arrow to go to the next track. If you hold the button or press it more than once, the player will continue moving forward through the CD. The sound will mute while seeking.

REV

Press and hold this button to reverse quickly through a track selection. Release it to resume playing.

FWD

Press and hold this button to advance quickly through a track selection. Release it to resume playing.

SEEK

Press the right arrow to seek to the next selection on the CD. Press the left arrow to search for the previous selection on the CD. The sound will mute while seeking.

P.SCAN

Press this button to hear the tracks in random, rather than sequential, order. DSC will appear on the radio display, which will randomly play the tracks on the current CD. Press P.SCAN again to make the radio display ALL, which will randomly play all loaded CDs. Press P.SCAN again to turn off random play, OFF will appear on the radio display.

CD TAPE

Press this button if you have a CD loaded into the changer and the radio is turned on, to play a CD. Press AM FM to return to the radio when a CD is playing. Press CD TAPE to switch between the tape and CD changer if all are loaded.

Theftlock™ (Uplevel/Luxury)

Important: Read all steps before starting the procedure.

If more than 15 seconds elapse between any of the steps, the radio automatically reverts to time and you must start the procedure over from step 4.

If SEC appears on the display in step 4, the system has already been activated.

To change the code, the old code must be removed first.

In order to activate the Theftlock™ system, perform the following steps:

  1. Write down any number from 000 to 1999.
  2. Turn the ignition to the ACCESSORY or the RUN position.
  3. Turn the radio OFF.
  4. Press the 1 and 4 push-buttons together. Hold them down until "- - -"shows on the display.
  5. Press MN and 000 will appear on the display.
  6. Press and hold MN again until the last two digits agree with your code.
  7. Press and hold HR to make the first 1 or 2 digits agree with your code.
  8. Press the AM/FM push button after you have confirmed that the code matches the code you wrote down. If REP appears on the display, repeat steps 5 through 8.
  9. SEC will appear on the display, the radio is now operable and secured.
  10. With the ignition OFF, the Theftlock™ indicator flashes.

Activating the Theftlock™ Feature

Important: Read all steps before starting the procedure.

If more than 15 seconds elapse between any of the steps, the radio automatically reverts to time and you must start the procedure over from step 4.

If SEC appears on the display in step 4, the system has already been activated.

To change the code, the old code must be removed first.

In order to activate the Theftlock™ system, perform the following steps:

  1. Write down any number from 000 to 1999.
  2. Turn the ignition to the ACCESSORY or the RUN position.
  3. Turn the radio OFF.
  4. Press the 1 and 4 push-buttons together. Hold them down until "- - -"shows on the display.
  5. Press MN and 000 will appear on the display.
  6. Press and hold MN again until the last two digits agree with your code.
  7. Press and hold HR to make the first one or two digits agree with your code.
  8. Press the AM/FM push button after you have confirmed that the code matches the code you wrote down. If REP appears on the display, repeat steps 5 through 8.
  9. SEC will appear on the display, the radio is now operable and secured.
  10. With the ignition OFF, the Theftlock™ indicator flashes.

Unlocking a Radio That Displays LOC When Code is Known

Important: Read all steps before starting the procedure.

If more than 15 seconds elapse between any of the steps, the radio automatically reverts to time and you must start the procedure over from step 4.

In order to unlock the Theftlock™ system after a power loss, perform the following steps:

  1. Write down the users code.
  2. Turn the ignition to the RUN position.
  3. Press MN and 000 will appear on the display.
  4. Press and hold MN until the last two digits agree with the code.
  5. Press and hold HR until the first one or two digits agree with the code.
  6. Press the AM/FM push button after you have confirmed that the code matches the one you wrote down. If REP appears on the display, repeat steps 3 through 6.
  7. SEC will appear on the display, the radio is now operable and secured.

If the wrong code is entered more than eight times, INOP will appear on the display.

Wait 1 hour before attempting to unlock the radio again.

This time only 3 attempts will be allowed before INOP appears on the display.

If this happens you must wait 1 hour before attempting to unlock the radio again.

Unlocking a Radio That Displays LOC When Code is Unknown

Important: Starting in 1995, a factory back-up code can be used to erase the original code if it is unknown.

Have account number ready to enter when asked. Account number is your 5 digit dealer code followed by one of these numbers:

   • Chevrolet - 1
   • Pontiac -2
   • Oldsmobile -3
   • Buick -4
   • GMT -5
   • Cadillac -6
   • GM Canada -7
   • Saturn -8
Read all steps before starting the procedure.

If more than 15 seconds elapse between any of the steps, the radio automatically reverts to time and you must start the procedure over from step 1.

In order to unlock the Theftlock™ system when code is unknown, perform the following steps:

  1. Press and hold push buttons 2 and 3 until a three digit code appears on the display.
  2. Write the three digit code on a piece of paper.
  3. Press the AM/FM push button, a three digit code will appear on the display again.
  4. Write the three digit code on a piece of paper.
  5. Call Delco Electronics at 1- 800 - 537 - 5140.
  6. Follow the computer prompts to obtain the back-up code to be used in place of unknown code.
  7. Press MN and 000 will appear on the display.
  8. Press and hold MN until the last two digits agree with the back-up code.
  9. Press and hold HR until the first one or two digits agree with the back-up code.
  10. Press the AM/FM push button after you have confirmed that the code matches the one you wrote down. If REP appears on the display, repeat steps 7 through 10.
  11. The display will show "- - -" to indicate unknown code has been removed.

If the back-up code does not unlock the radio, try reversing the first and last three digits of the display code.

If this is unsuccessful, call Delco Electronics to obtain a new factory back-up code.

Disabling the Theftlock™ Feature

Important: If more than 15 seconds elapse between any of the steps, the radio automatically reverts to time and you must start the procedure over from step 3.

In order to disable the Theftlock™ feature, enter the user code as follows:

  1. Turn the ignition to ACCESSORY or RUN.
  2. Turn the radio OFF.
  3. Press the 1 and 4 buttons together. Hold then down until SEC appears on the display.
  4. Press MN and "000" will appear on the display.
  5. Press and hold MN until the last two digits agree with the user code.
  6. Press and hold HR until the first one or two digits agree with the user code.
  7. Press the AM/FM push button after you have confirmed that the code matches the one you wrote down. If REP appears on the display, repeat steps 4 through 7.
  8. The display will show "- - -", indicating that the radio is no longer secured.
  9. If the code is entered incorrectly, SEC appears on the display.
  10. The radio will remain secured until the correct code is entered.

Rear Seat Audio (RSA)

The Rear Seat Audio Controller feature allows the rear seat passengers to listen to a different music source than the front seat passengers including the cassette tape and the remote compact disc (CD) players. For example, the rear seat passengers may listen to the cassette or CD through headphones while the driver listens to the radio through the front speakers. The rear seat passengers have control of the volume for each headphone. Be aware that the primary radio controls always override the rear seat audio controls.

Seek (SEEK)

The sound will mute while seeking. The SEEK button is inactive when the front radio is also using the SEEK feature. Use the following procedure in order to seek:

  1. Press the up arrow in order to tune to the next higher station (with enough strength) and stay there.
  2. Press the down arrow to tune to the next lower station (with enough strength) and stay there.

Use the following procedure in order to seek selections on a cassette tape:

  1. Press the up arrow in order to hear the next selection on the tape.
  2. Press the down arrow in order to go back to the previous selection.

Use the following procedure in order to seek selections on a compact disc:

  1. Press the up arrow in order to immediately listen to the next track instead of waiting until the current track is finished.
  2. Hold the up arrow button or press it more than once in order to advance to further tracks.
  3. Press the down arrow in order to go to the start of the current track if more than 8 seconds have played.

Power (PWR)

Press this button in order to turn the rear seat audio system ON or OFF. The rear speakers mute when the power is turned ON. You may operate the rear seat audio functions even when the primary radio power is off.

Band Switching (AM/FM)

Press the AM/FM button in order to switch between AM, FM1 and FM2. The selection appears on the display. If the front passengers are already listening to AM-FM, the rear seat audio controller will not switch between the bands and cannot change the frequency.

Source Switching (TAPE CD)

Use the following procedure in order to switch between listening sources:

  1. Press the TAPE CD button in order to activate the source switching feature. There must be a cassette tape and/or compact disc in the player.
  2. Press the TAPE CD button in order to switch between the cassette tape and the compact disc functions.

Preset Program (PSET PROG)

The front passenger must be listening to something different for the PSET PROG to operate. Press the PSET PROG in order to use the following functions:

    • To seek through your preset radio stations that are set on your primary radio push-buttons.
    • To go to the other side of the cassette tape while the cassette is playing.
    • To change discs when a compact disc is playing. This button will no operate if used with a single remote compact disc player.

Volume (VOL)

The upper VOL knob, the upper headphone jack, and the lower VOL knob controls the lower headphone jack.

Use the following procedure in order to operate the volume control:

  1. Press lightly on the VOL knob in order to extend the knob.
  2. Turn the knob clockwise in order to increase the volume.
  3. Turn the knob counterclockwise in order to decrease the volume.
  4. Push the knob in when you are not using the volume control.

Steering Wheel Controls (SWC)

PROG

Press this button to play a station you have programmed on the radio preset buttons on the selected band. If a cassette tape is playing, press this button to play the other side of the tape. If a compact disc is playing in the console-mounted CD changer, press this button to go to the next available CD.

SEEK

Press the up arrow to tune to the next radio station and the down arrow to tune to the previous radio station. If a cassette tape or compact disc is playing, the player will advance forward with the up arrow to the next track or backward with the down arrow to the previous track.

MUTE

Press this button to silence the system. Press it again to turn on the sound.

VOL

Press the up or down arrow to increase or decrease volume