For 1990-2009 cars

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.

Battery Voltage: 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 : The scan tool displays whether the driver seat belt is buckled or unbuckled.
Passenger Seat Belt Switch : The scan tool displays whether the passenger seat belt is buckled or unbuckled.
PPS Type : The scan tool displays if there is a passenger airbag suppression device used on this vehicle and if so, whether it is has an automatic, manual key switch or both.
Primary Key Status : The scan tool displays if there is a passenger airbag suppression device used on this vehicle and if so, whether it is has an automatic, manual key switch or both.
Received Primary Key : The scan tool displays what the BCM is sending out as the primary key. The SDM then compares it to what it has stored. This should match the SDM Primary Key.
Received VIN Digits 2-5 : 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 : 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 : The scan tool displays what the current power mode of the SDM.
SDM Primary Key : The scan tool displays primary key that the SDM has stored to memory.
Secondary Key Status : 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: The scan tool displays whether the SIR warning indicator has been requested ON or OFF.