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.
SIR scan tool data definitions
- Battery Voltage Signal
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The scan tool displays 0-20 volts. This is the system voltage measured by the SDM between the battery input and ground.
- Driver Seat Belt Switch
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The scan tool displays whether the driver seat belt is buckled or unbuckled.
- Driver Seat Belt Type
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The scan tool displays whether the driver seat uses a switch or a sensor for the seat belt buckle.
- Driver Seat Position Sensor
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The scan tool displays whether the driver seat is in the Forward or Rearward position to determine if the airbag should activate single or dual stage deployment as necessary
- Passenger Seat Belt Switch
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The scan tool displays whether the passenger seat belt is buckled or unbuckled.
- Primary Key Status
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The scan tool displays the status of the primary key based on the comparison between the BCM and the SDM. If the Status is other than Valid the SDM will not allow activation and should set a DTC.
- Psgr. Seat Belt Sensor
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The scan tool displays whether the passenger seat belt is buckled or unbuckled.
- Psgr. Seat Belt Type
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The scan tool displays whether the passenger seat uses a switch or a sensor for the seat belt buckle.
- Psgr. Seat Position Sensor
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The scan tool displays whether the passenger seat is in the Forward or Rearward position to determine if the airbag should activate single or dual stage deployment as necessary
- Received Primary Key
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The scan tool displays what the SDM received from the BCM as the primary key. The SDM then compares it to what it has stored to determine the Primary Key Status. The SDM Primary Key and Received Primary Key should match.
- Received VIN Digits 2-5
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The scan tool displays the Secondary Key which includes digits 2 though 5 of the VIN that the BCM sends to the SDM.
- Received VIN Digits 6-7
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The scan tool displays the Secondary Key which includes digits 6 and 7 of the VIN that the BCM sends to the SDM.
- Run/Crank
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The scan tool displays the current power mode of the SDM.
- SDM Primary Key
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The scan tool displays primary key that the SDM has stored to memory.
- Secondary Key Status
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The scan tool displays whether the Secondary Key is valid or invalid. This determines if the VIN stored in SDM memory matches what is stored in the BCM.
- SIR Warning Indicator
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The scan tool displays whether the SIR warning indicator has been requested ON or OFF.
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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.