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

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

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.

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

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

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

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 identification number of the radios internal PROM.

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

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.

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

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. The strength of the station that the radio is tuned to.

Slave PROM ID: The scan tool displays 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 feature is on.

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.

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