The scan tool used provides the following capabilities:

Make sure the scan tool contains updated software before attempting to communicate with the SIR system. To use the scan tool, connect it to the Data Link Connector (DLC) and turn the ignition switch to the RUN position. The scan tool reads serial data sent from the inflatable restraint Sensing and Diagnostic Module (SDM) serial data output terminal 5 and 17 to the DLC terminal 2. The following table shows the typical values of the data displays under the following conditions:

Data List	Description	Typical Value
Ignition 1	Ignition 1 power feed	10-15 V
Driver Frontal Senselo	Driver frontal low terminal voltage	3 V
Passenger Frontal Senselo	Passenger frontal low terminal voltage	3 V
Pass. Frontal Energy Reserve	IP module loop reserve voltage	22-24 V
Driver Frontal Energy Reserve	Driver frontal loop reserve voltage	22-24 V
Warning Lamp ON	Continuous warning lamp ON time	0-182 Hrs.
Ign. cycles lamp Off	Number of ignition cycles with the warning lamp OFF	0-125
Ignition cycles lamp ON	Number of ignition cycles with the warning lamp ON	0-125
Driver Frontal VDIF	Voltage difference between driver frontal high and driver frontal low terminals	4-12 mV
Passenger Frontal VDIF	Voltage difference between passenger frontal high and passenger frontal low terminals	4-12 mV
Driver Pretensioner Senselo	Driver pretensioner low terminal voltage	3 V
Passenger Pretensioner Senselo	Passenger pretensioner low terminal voltage	3 V
Driver Pretensioner VDIF	Voltage difference between driver pretensioner high and driver pretensioner low terminals	4-12 mV
Passenger Pretensioner VDIF	Voltage difference between passenger pretensioner high and passenger pretensioner low terminals	4-12 mV
Driver Pretens. Energy Reserve	Driver pretensioner loop reserve voltage	22-24 V
Pass. Pretens. Energy Reserve	Passenger pretensioner loop reserve voltage	22-24 V
Seat Belt Status	Shown under Inputs: Driver seat belt status (Buckled/Unbuckled)	Buckled

SIR Scan Tool Definitions

The following list contain a brief description of all SIR related parameters available on the scan tool. The list is in the order it appears on the scan tool.

Ignition: The scan tool displays 0-25.5 Volts. The Ignition represents the system voltage measured by the SDM at its ignition feed.

Driver Senselo: The scan tool displays 0-20 Volts. The SDM measures the voltage of the driver frontal low terminal voltage and displays it as Driver Senselo.

Passenger Senselo: The scan tool displays 0-20 Volts. The SDM measures the voltage of the passenger frontal low terminal voltage and displays it as Passenger Senselo.

Driver VDIF: The scan tool displays 0-500 Millivolts. The SDM measures the difference between driver frontal high and driver frontal low to determine voltage differential.

Passenger VDIF: The scan tool displays 0-500 Millivolts. The SDM measures the difference between passenger frontal high and driver frontal low terminals to determine voltage differential.

Driver Energy Reserve: The scan tool displays 0-30 Volts. The SDM measures the voltage of the driver frontal energy reserve capacitors inside the SDM and displays it as Driver Energy Reserve.

Passenger Energy Reserve: The scan tool displays 0-30 Volts. The SDM measures the voltage of the passenger frontal energy reserve capacitors inside the SDM and displays it as Passenger Energy Reserve.

Warning Lamp ON Time: The scan tool displays 0-182 Hours. The SDM measures the continuous warning lamp on time.

Ignition Cycles Lamp ON: The scan tool displays 0-125 Cycles. The ignition cycles with the warning lamp ON.

Ignition Cycles Lamp OFF: The scan tool displays 0-125 Cycles. The ignition cycles with the warning lamp OFF.

Seatbelt Status: The scan tool displays Buckled or Unbuckled. The SDM receives a discrete signal from the seat belt switch at SDM terminal 1. The SDM sends the seat belt message status over the Class 2 Serial Data Line.