Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Scan Tool Data Definitions
8-Digit GM Part Number: The scan tool displays an 8 digit numeric number. The part number of the module.
Amplifier: The scan tool displays Present or Not Present. The scan tool displays Present when the Amp sense wire has been grounded to signal that an amplifier is present.
Antenna Signal: The scan tool displays 0-300 dBuV.
Band Number: The scan tool displays AM/FM1/FM2. The current band that the radio is in.
Calibration ID: The scan tool displays 0-9999. The number designating what calibrations the module contains.
Cassette Cut Tape: The scan tool displays 0-999. The number of cut tape errors the radio has recorded
Cassette Inserted: The scan tool displays Yes/No. The scan tool displays Yes when a tape has been inserted in the radio.
Cass. Load/Unload Errors: The scan tool displays 0-999. The number of cassette loading and unloading errors the radio has recorded.
Cassette Metal: The scan tool displays Metal/Not Metal. The scan tool displays Metal when it detects that a metal tape has been inserted in the radio.
Cassette Side: The scan tool displays Top/Bottom. The scan tool displays Top when the tape is playing side A.
Cassette Tight Tape: The scan tool displays 0-999. The number of cassette tight tape errors the radio has recorded.
CD Changer: The scan tool displays Connected/Not Connected. The scan tool displays Connected when the radio receives Class 2 information from the CD changer.
CD Changer Tracking Errors: The scan tool displays 0-999. The number of CD tracking errors the CD changer has recorded.
CD Focus Errors: The scan tool displays 0-999. The number of CD focus errors the radio or CD changer has recorded.
CD Inserted: The scan tool displays Yes/No. The scan tool displays Yes when a CD has been inserted in the radio.
CD Load/Unload Errors: The scan tool displays 0- 999. The number of CD loading and unloading errors recorded.
CD Tracking Errors: The scan tool displays 0-999. The number of CD tracking errors recorded.
Component Serial # 8-11: The scan tool displays 0-9999. The first portion of the serial number.
Component Serial #12: The scan tool displays 0-9. The second portion of the serial number.
Component Serial #13: The scan tool displays 0-9. The third portion of the serial number.
Driver Number: The scan tool displays Driver 1-2. The memory position the driver has selected as received by Class 2 lines.
Julian Date of Build: The scan tool displays 0-999. The day of the year that the module was built.
New VIN Counter: The scan tool displays 0-99. The number of times a new VIN number has been set in the radio.
Phone: The scan tool displays Present or Not Present. The scan tool displays Connected when the radio receives Class 2 information from the phone module.
Preset Control: The scan tool displays Preset 1-6 when the radio is on a preset station, or Not A Preset when the radio is not on a preset station.
PROM ID: The scan tool displays 0-9999. The identification number of the modules internal PROM.
Sequence Number: The scan tool displays 0-9999.
Single CD Track Number: The scan tool displays 00-19. The scan tool displays the current track of the CD in the CD player.
Source: The scan tool displays CD/CD Changer/Tuner/Tape. The scan tool displays the current mode the radio is in.
Steering Wheel Controls: The scan tool displays 0-999 counts. The signal in counts as received from the steering wheel controls.
Theft Armed: The scan tool displays Learned VIN/No VIN. The Scan tool displays Learned VIN when the theft mode has been turned ON by recognizing a valid VIN #.
Theft Lock: The scan tool displays Locked/Unlocked. The scan tool displays Unlocked when the radio receives the correct VIN information from the PCM via Class 2.
Total Cassette Hours: The scan tool displays 0-999 hrs. The total number of hours the cassette player has been used.
Total CD Hours: The scan tool displays 0-999 hrs. The total number of hours the CD player has been used.
Total CD/MD Hours: The scan tool displays 0-999 hrs. The total number of hours the CD changer 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 a 1990-2020. The production year the module was manufactured.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.