For 1990-2009 cars

The scan tool used provides the following capabilities:

• | Read the data list

• | Read current and history diagnostic trouble codes (DTCs)

• | Clear the DTCs after a repair is completed

Before attempting to communicate with the SIR system, ensure that the scan tool contains the latest software. Connect the scan tool to the data link connector (DLC) and turn the ignition switch to the RUN position. The scan tool reads the serial data sent from the inflatable restraint sensing and diagnostic module (SDM) serial data output terminal 5 to the DLC terminal 9. The following table shows the typical values of the data displays under the following conditions:

• | The ignition switch is in the RUN position.

• | The engine is OFF.

• | The driver seatbelt is buckled.

Data List | Description | Typical Value
--- | --- | ---
Ignition | Ignition 1 power feed | 12 V
Lamp Driver | Warning lamp control method (hard wired lamp) | Internal
Driver Resistance | Driver deployment loop resistance | 2.6 ohms
Passenger Resistance | Passenger deployment loop resistance | 2.2 ohms
Driver Senselo | Driver low terminal voltage | 4.1 V
Passenger Senselo | Passenger low terminal voltage | 4.1 V
Driver VDIF | Voltage difference between driver high and driver low terminals | 4-8 mV
Passenger VDIF | Voltage difference between passenger high and passenger low terminals | 4-8 mV
Warning Lamp ON | Continuous warning lamp ON time | 0 - 182 Hrs
Warning Lamp Control | Warning lamp state commanded by the SDM (On/Off) | Off
Lamp Driver Feedback | Warning lamp state detected by the SDM (Active/Inactive) | Inactive
Warning Lamp Cycles | Ignition cycles of the current warning lamp state | 0 - 125 Cycles
Driver Seatbelt | Driver seatbelt status (Buckled/Unbuckled) | Buckled