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 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:

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.