GM Service Manual Online
For 1990-2009 cars only
8-Digit GM Part Number: The scan tool displays an 8 digit alphanumeric number. The part number of the module.

AM Pass A Stop Level: This is the first pass stopping level for the seek/scan feature. If nothing is found above this level, the radio will then go to the AM Pass B Stop Level.

AM Pass B Stop Level: This is the second pass stopping level for the seek/scan feature.

Antenna Power: The scan tool displays On/Off. The state of the antenna enable terminal.

Auto Gain Control:  The scan tool displays the amount of gain applied to a remote CD player input. This is a factory preset value and is not changeable.

Auto Volume Control: The scan tool displays On/Off. The state of the auto volume control function.

Balance Control: The scan tool displays 0-252 counts. The amount of left to right balance selected.

Band Number: The scan tool displays AM/FM1/FM2. The current band that the radio is in.

Bass Control: The scan tool displays 0-252 counts. The amount of bass selected.

Battery Voltage: The scan tool displays 0-25.5 volts. The voltage measured from the modules battery positive voltage circuit to the modules ground circuit.

Calibration ID: The scan tool displays 0-9999. The number designating what calibrations the radio contains.

CD Changer: The scan tool displays Connected/Disconnected. The module displays connected when a remote CD changer is present.

CD Changer H.W. Level: The scan tool displays 0-999. The number of the CD changer hardware level.

CD Changer S.W. Level: The scan tool displays 0-999. The number of the CD changer software level.

Chime: The scan tool displays On/Off indicating the requested state of the chime.

Chime Mode: The scan tool displays On/Off indicating the requested state of the chime.

Clock: The scan tool displays 12hr or 24hr.

Component Serial # 8-11: The scan tool displays 0-999. The internal programing codes of the module.

Component Serial # 12: The scan tool displays 0-99. The internal programing codes of the module.

Driver Number: The scan tool displays 1-2. The memory position the driver has selected as received by Class 2 lines.

DSP Level: The scan tool displays 0-252. The amount of effect selected for DSP mode.

DSP Selected: The scan tool displays the equalization setting selected (talk, front/driver seat, ambience, spacious, or off).

Fade Control: The scan tool displays 0-252 counts. The amount of front to rear fade selected.

Fan Control: The scan tool displays On/Off. The state of the radios internal fan.

FM Pass A Stop Level: This is the first pass stopping level for the seek/scan feature. If nothing is found above this level, the radio will then go to the FM Pass B Stop Level.

FM Pass B Stop Level: This is the second pass stopping level for the seek/scan feature.

Ign. Cycles Since Last DTC: The scan tool displays the number of ignition cycles since the last DTC was set.

Julian Date of Build: The scan tool displays 0-999. The month and year that the module was built.

Language: The scan tool displays what language is being displayed on the radio.

Master PROM ID: The scan tool displays 0-9999. The identification number of the radios internal PROM.

Microphone Low: The scan tool displays 0-255 counts. The amount of noise measured in the vehicle. This is the lower of two measurements. Once this has reached the limit, noise is then measured in Microphone High.

Microphone High: The scan tool displays 0-255 counts. The amount of noise measured in the vehicle. This is the higher of two measurements. Once Microphone Low has reached the limit, noise is then measured in Microphone High.

Mid Control:  The scan tool displays 0-252 counts. The amount of mid range selected.

Mono Volume Control: The scan tool displays 0-99 counts. The volume selected for the phone output.

Mute: The scan tool displays On/Off indicating the state of the mute button.

Mute Button: The scan tool displays On/Off indicating the state of the mute button.

New VIN Counter: The scan tool displays 0-99. The number of times the radio has been in different vehicles.

Phone Active: The scan tool displays Active/Inactive. Whether or not the phone is currently active.

Point of Sale: The scan tool displays the country the vehicle was sold in.

Power Mode Config.: The vehicle configuration that the radio is set up for (Deville, Seville, or Eldorado).

Preset Settings: The scan tool displays Home/Away. Whether the radio is set to home settings or away settings.

PROM ID: The scan tool displays 0-9999. The identification number of the radios internal PROM.

PROM ID 1: The scan tool displays 0-9999. The identification number of the radios internal PROM.

PROM ID 2: The scan tool displays 0-9999. The identification number of the radios internal PROM.

Region Code: The scan tool displays the region the radio is set for (US, Asia, Australia, Europe, Saudi).

Sequence Number: The shift and sequence of build of the radio.

Signal Strength: The scan tool displays 0-255 decibels. The strength of the station that the radio is tuned to.

Slave PROM ID: The scan tool displays 0-9999. The identification number of the radios internal PROM.

Source Selected: The scan tool displays which sound source has been selected (Tuner, Cassette, CD/MD, CDX, Phone, Radio Off).

Theft Lock: The scan tool displays Active/Inactive. The scan tool displays active when the radio receives the incorrect VIN number across Class 2 lines.

Tone Generator: The scan tool displays 0-255 counts. The volume of the chime.

Total Cassette Hours:  The scan tool displays 0-999 hrs. The total number of hours the cassette player has been used.

Total CD/MD Hours:  The scan tool displays 0-999 hrs. The total number of hours the CD/MD player has been used.

Total Radio Hours: The scan tool displays 0-999 hrs. The total number of hours the radio has been used.

Treble Control: The scan tool displays 0-252 counts. The amount of treble selected.

Volume Control: The scan tool displays 0-255 counts. The volume selected.

Year Module Built:  The scan tool displays 1990-2020. The production year the module was manufactured.