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 all DTCs after a repair is completed.

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 12 to the DLC terminal 9.

The SIR Scan Tool Data List contains all restraint related parameters that are available on the scan tool. The list is arranged in the order as they appear on the scan tool.

Use the SIR Scan Tool Data List only after the following is determined:

• | Diagnostic System Check is completed.

• | No Diagnostic Trouble Codes (DTCs) are set.

• | SIR Diagnostics indicates functioning properly.

Scan tool values from a properly operating system may be used for comparison with the SIR system you are diagnosing. The SIR Scan Tool Data List represents values seen on a properly operating system.

Important: Make sure the scan tool that you are using is functioning properly. Use of a malfunctioning scan tool can result in misdiagnosis and unnecessary parts replacement.

Only the parameters listed below are referenced in this service manual for use in diagnosis. If all values are within the typical range described below, refer to Intermittents and Poor Connections for diagnosis.

#### SIR Scan Tool Data List

Scan Tool Parameter | Description | Typical Data Value
--- | --- | ---
Ignition ON, Engine OFF, and Driver Seat Belt Buckled
Ignition | Ignition power feed | 12 V
Driver Frontal Resist. | Driver frontal air bag deployment loop resistance | 2.8 ohms
Pass. Frontal Resist. | Passenger frontal air bag deployment loop resistance | 2.2 ohms
LH Side Air Bag Resist. | Driver side air bag deployment loop resistance | 2.4 ohms
RH Side Air Bag Resist. | Passenger side air bag deployment loop resistance | 2.4 ohms
LH Pretens. Resist. | Driver pretensioner deployment loop resistance | 2.4 ohms
RH Pretens. Resist. | Passenger pretensioner deployment loop resistance | 2.4 ohms
Driver Frontal Senselo | Driver frontal air bag low voltage | 3.1 V
Pass. Frontal Senselo | Passenger frontal air bag low voltage | 3.1 V
LH Side Air Bag Senselo | Driver side air bag low voltage | 3.1 V
RH Side Air Bag Senselo | Passenger side air bag low voltage | 3.1 V
LH Pretens. Senselo | Driver pretensioner low voltage | 3.1 V
RH Pretens. Senselo | Passenger pretensioner low voltage | 3.1 V
Driver Frontal VDIF | Driver frontal air bag deployment loop voltage difference | 4-10 mV
Passenger Frontal VDIF | Passenger frontal air bag deployment loop voltage difference | 4-10 mV
LH Side Air Bag VDIF | Driver side air bag deployment loop voltage difference | 4-10 mV
RH Side Air Bag VDIF | Passenger side air bag deployment loop voltage difference | 4-10 mV
LH Pretensioner VDIF | Driver pretensioner deployment loop voltage difference | 4-10 mV
RH Pretensioner VDIF | Passenger pretensioner deployment loop voltage difference | 4-10 mV
Warning Lamp On | Warning lamp state commanded | 0-182 Hours
Warning Lamp Cycles | Number of ignition cycles with Warning Lamp On | 0-125 Cycles
Driver Seatbelt | Buckled/Unbuckled | Buckled