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
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The scan tool displays an 8 digit numeric number. The part number of the module.
- Amplifier
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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.
- Amp Type
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The scan tool displays Bose/Non-Bose, the type of amplifier installed in the vehicle.
- Antenna Enable
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The scan tool displays Active/Inactive.
- Band Number
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The scan tool displays AM/FM1/FM2. The current band that the radio is in.
- Calibration ID
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The scan tool displays 0-9999. The number designating what calibrations the module contains.
- CD Changer
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The scan tool displays Connected/Not Connected. The scan tool displays Connected when the radio receives Class 2 information from the CD changer.
- Channel Number
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The scan tool displays the channel the radio is tuned to.
- Driver Number
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The scan tool displays Driver 1-2. The memory position the driver has selected as received by Class 2 lines.
- Fan Control
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The scan tool displays the status of the fan.
- Julian Date of Build
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The scan tool displays 0-999. The day of the year that the module was built.
- New VIN Counter
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The scan tool displays 0-99. The number of times a new VIN number has been set in the radio.
- Phone
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The scan tool displays Present or Not Present. The scan tool displays Connected when the radio receives Class 2 information from the phone module.
- Power Mode Config.
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The scan tool displays the current power mode of the vehicle.
- Preset Control
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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
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The scan tool displays 0-9999. The identification number of the modules internal PROM.
- Signal Strength
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The scan tool displays the strength of the received signal in dB.
- Theft Armed
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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
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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.
- Year Module Built
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The scan tool displays a 1990- 2020, the production year the module was manufactured.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.