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
The SIR scan tool data definitions contain a brief description of all SIR related parameters available on the scan tool. The parameters that are available on the scan tool are listed below in alphabetical order.
- 8-Digit GM Part Number
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The scan tool displays an 8-digit part number. This number is the GM part number that is stored within the SDM memory.
- Active Switch
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The scan tool displays enabled or disabled. The signal from the inflatable restraint I/P module disable switch indicates whether the passenger frontal air bag is enabled or disabled.
- Calibration ID
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The scan tool displays a 4-digit number. This calibration ID is the check sum of the SDM read only memory contents.
- Component Serial Number
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The scan tool displays the digits of the SDM serial number.
- Front End Sensor #1 ID
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The scan tool displays a 2-digit ID number. The ID signal sent to the SDM from the left front end sensor.
- Front End Sensor #2 ID
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The scan tool displays a 2-digit ID number. The ID signal sent to the SDM from the right front end sensor.
- Ignition Voltage
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The scan tool displays 0-20 volts. Ignition represents the system voltage measured by the SDM at its ignition 1 voltage feed.
- Julian Date of Build
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The scan tool displays a 3-digit number. An example would be 723. 723 is July 23 which is day 204 based on the Julian Calendar.
- Driver Seat Belt Status
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The scan tool displays buckled or unbuckled. The signal from the driver seat belt switch indicates whether the driver seat belt is buckled or unbuckled.
- Passenger Side Impact Sensor (SIS) ID, (RPO HP2)
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The scan tool displays a 2-digit ID number. The ID signal sent to the SDM from the SIS.
- ROM ID
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The scan tool displays a 4-digit number. This number is the read-only memory (ROM) ID.
- Year Module Built
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The scan tool displays what year the module was built.
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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.