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.

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 ON position. The scan tool reads serial data sent from the inflatable restraint sensing and diagnostic and seat belt pretensioner module (SDM) serial data output terminal 12 to the DLC terminal 12. The following table shows the typical values of the data displays under the following conditions:

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 | Units Displayed | Typical Data Value
--- | --- | ---
Ignition ON, Engine OFF, and driver seat belt buckled
SDM Configuration | -- | Driv Pass & Side
Ignition | Volts | 12 V
Ignition Status | -- | OK
Driver Air Bag Res. | Ohms | 2.9 ohms
Passenger Air Bag Res. | Ohms | 2.3 ohms
LH Pretens. Resist. | Ohms | 2.5 ohms
RH Pretens. Resist. | Ohms | 2.4 ohms
LH Side Air Bag Resist. | Ohms | 2.4 ohms
RH Side Air Bag Resist. | Ohms | 2.4 ohms
Warning Lamp | -- | ON
LH SIS Message Status (Side Impact Sensor) | -- | OK
LH SIS Init. Status (Side Impact Sensor) | -- | OK
LH SIS Comm. Error (Side Impact Sensor) | -- | No Error
RH SIS Message Status (Side Impact Sensor) | -- | OK
RH SIS Init. Status (Side Impact Sensor) | -- | OK
RH SIS Comm. Error (Side Impact Sensor) | -- | No Error
Reset LH Side Air Bag After Deployment | -- | INACTIVE
Reset RH Side Air Bag After Deployment | -- | INACTIVE
Reset Pretensioner After Deployment | -- | INACTIVE