GM Service Manual Online
For 1990-2009 cars only

Notice: Do not attempt to insert any disc into a CD player except those discs which display the symbol shown on the disc label illustration. Insertion of a disc which does not display this symbol, such as the 76 mm (3 in) disc, may cause damage to the CD player and/or disc.


Object Number: 258791  Size: SH

Power Cycling

If a CD is playing when the radio is turned off or powered down, upon turning back on, the CD resumes playing from the position reached prior to the shut down. The radio display shows the disc selected (U1S) and/or track selected and the CD changer icon and/or CD icon is lit. If the radio is shut down or looses battery voltage upon reapplication of power, the following actions occur:

When the radio is in the OFF mode.

    • The time of day is displayed for 5 seconds
    • CALIBRATING appears for 5 seconds

When the radio is turned on, the following actions occur:

    • CALIBRATING appears for 5 seconds
    • The CD or CD changer is initialized.
    • The CD starts where it was prior to power loss
    • The CD changer will start at disc 1 track 1

CD Load, CD Player

The CD player will automatically complete the loading cycle after you insert a CD approximately 1/2 of the way into the CD player. The CD player will begin playing track 1 on the disc.

If the CD player is not presently loaded, the CD Load function is available at all times.

CD Load, CD Changer


Object Number: 493017  Size: SH

Load the CD into the cartridge tray (1), with the label surface facing up.


Object Number: 493016  Size: SH

The CD changer cartridge (1) must be fully inserted and the CD changer door fully closed for the CD changer to load the first disc. The CD changer will shuffle through the cartridge trays to determine which trays contain discs. CD changer icon will flash during this time.

CD Eject, CD player

The CD eject function is active with battery voltage. You may eject the disc with the ignition switch in the OFF position. With the radio and ignition in the ON position, pressing the EJECT button mutes the disc and the audio switches to the previous radio function. The loading motors eject the disc. The CD IN indicator turns off.

At any time, with the radio or the ignition in the ON position or the OFF position, if you do not remove an ejected disc from the CD load mechanism within 25 seconds the disc will automatically reload. The play mode will not activate.

CD Eject, CD changer

The cartridge eject function is active with battery voltage. You may eject the cartridge with the ignition switch in the OFF position. With the radio and ignition in the ON position, opening the CD changer cartridge door mutes the disc and the audio switches to the previous radio function. The loading motors eject the cartridge. The CD changer Icon turns off.

TAPE/AUX Button (U1N)

Press the TAPE/AUX button in order to switch between the remote CD changer (U1S) and the tape. TAPE will appear when the tape is active. The disc number and track number appears when the remote CD changer is active.

CD/AUX Button (U1P)

Press the CD/AUX button in order to switch between the CD player and the remote CD changer (U1S). The disc number and track number appears when the remote CD changer is active. The track number appears when the remote CD changer is active.

CD/TAPE Button (U1Q)

Press the CD/TAPE button in order to switch between the CD player, the remote CD changer (U1S) and the tape. TAPE will appear when the tape is active. The disc number and track number appears when the remote CD changer is active. The track number appears when the CD is active.

Recall Button (RCL)

Press the RCL button in order to display the length of time that the current track has been playing.

Stop

The following functions stop the CD player from playing:

    • The AM/FM button
    • Ejecting a disc
    • Loading a tape

The following functions stop the CD changer from playing:

    • The AM/FM button
    • Ejecting the cartridge
    • Loading a tape
    • Loading a CD into the CD player

Press the AM/FM button in order to switch the unit to the radio mode. This will display the last frequency and band selected. The TAPE/CD button switches the unit to cassette mode only on dual playback units with a cassette loaded. Load a tape in order to switch the unit to the cassette mode. Eject the disc, or CD changer cartridge in order to switch the unit to the tuner mode.

Random (RDM Button)

The RDM button is a non-latching control. The RDM button serves as a dual function with the radio preset # 3. Press the RDM button in the CD play mode, in order to stop playing the current selection while the microcomputer chooses a random playback order. Play then resumes, the tracks play in the random order that was chosen. When the final selection has been played, the unit continues playing in the original random order. Press the RDM button at any point during random playback in order to continue in the normal sequence beginning with the current track. For remote CD changer options, the random feature operates between the tracks on all of the available discs. The RDM icon is displayed when the feature is active.

Fast Reverse (REV Button)

The REV button is a non-latching momentary contact control. The REV button serves a dual function with the radio preset button # 4. The radio preset button is a press and hold type button. The button allows reverse movement within the disc at a faster rate than normal playback rate as long as the button is held. When activated, the audio level reduces by 6dB. The disc plays in the reverse direction at a rate of 6 times normal speed. Elapsed time within the selected track displays while in the REV mode. The following items display after you release the REV button:

    • The disc number (U1S) and/or track number
    • The user selected default

Fast Forward (FWD Button)

The FWD button is a non-latching momentary contact control. The FWD button serves a dual function with the radio preset button # 1. The radio preset button is a press and hold type button. The button allows forward movement within the disc at a faster rate than normal playback rate as long as the button is held. When activated, the audio level reduces by 6dB. The disc plays in the forward direction at a rate of 6 times normal speed. Elapsed time within the selected track displays while in the FWD mode. The following items display after you release the FWD button:

    • The disc number (U1S) and/or track number
    • The user selected default

Disc Select (PROG Button)

For CD changer applications (U1S), the radio PROG button is a non-latching momentary contact control. The PROG button serves a dual function with the radio preset button # 2. It functions as a disc select when you are in the CD changer mode. Each momentary button press increases the disc number by one, starting from the presently selected disc or at the lowest numbered disc, if a disc has not been previously selected. The disc count wraps back to the first available disc after the last disc is selected. Preset button # 5 is a hidden button that decreases the disc number by one. Only the cartridge slot numbers with discs installed are available for selection. During the selection process the following actions occur:

    • The disc number displays
    • Track number 1 is displayed
    • The audio mutes

The disc and track numbers always display simultaneously.

Error (ERR) Detection, CD player

The radio display indicates an ERR in the display if any of the following conditions exist:

    • Moisture impairs the focusing mechanism
    • A tracking problem occurs
    • A servo problem occurs.
    • A disc is inserted upside down

The ERR remains lit in the display for 5 seconds, along with the normal information.

If you insert a CD upside down, the following actions occur:

    • 00 appears in the display
    • E30 when the CD is selected to be played
    • The disc ejects

The ERR graphics turn off under one of the following conditions:

    • 5 seconds expire
    • The radio becomes the active source

The ERR display does not light unless the following conditions are true:

    • The CD player is active
    • The CD player is in the play mode

Error (ERR) Detection, CD changer

The radio display indicates an ERR in the display if any of the following conditions exist:

    • Moisture impairs the focusing mechanism
    • A tracking problem occurs
    • A servo problem occurs
    • A disc has been inserted into the cartridge tray with the label surface facing down

The ERR remains lit in the display for 5 seconds, along with the normal information. If you insert CD upside down, the following actions occur:

    • The CD player is not able to initialize
    • The unit will not shift into the audio modes
    • An ERR is lit in the display

The ERR graphics turn off under one of the following conditions:

    • 5 seconds expire
    • The CD is reinserted correctly

The ERR display does not light unless the following conditions are true:

    • The CD changer is active
    • The CD changer is in the play mode

Mode Switching

The unit changes status without popping on the audio lines. The lapses do not exceed 2 seconds between switching sources. After the initialization occurs there are no pauses.