For 1990-2009 cars

The scan tool provides the following capabilities:

• | Read the data list.

• | Read the current trouble codes and the history trouble codes.

• | After a repair is completed, clear the diagnostic trouble codes.

Before communicating with the SIR system, ensure the scan tool contains the latest software In order to use the scan tool, connect the scan tool to the Data Link Connector (DLC), and turn the ignition switch to the ON position. The scan tool reads serial data from the inflatable restraint Sensing and Diagnostic Module (SDM).The serial data comes from the SDM output terminal 1 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 in alphabetical order.

Use the SIR Scan Tool Data List, only after the following conditions are met:

• | The Diagnostic System Check is completed.

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

• | The SIR Diagnostics indicate correct operation.

Compare the scan tool values from a system that operates correctly with the values from the SIR system that you are diagnosing. The SIR Scan Tool Data List presents the values of a system that operates correctly.

Important: Verify that the scan tool that you are using operates correctly. Use of a malfunctioning scan tool can result in misdiagnosis and in unnecessary parts replacement.

Only the parameters below are referenced in this service manual for use in diagnosis. If the values match the values of a system that operates correctly, refer to Testing for Intermittent Conditions and Poor Connections for diagnosis.

Scan Tool Parameter | Units Displayed | Typical Data Value
--- | --- | ---
Ignition ON, Engine OFF, and Driver Seat Belt Buckled
ADS (Forward Discriminating Sensor) | Active/Inactive | Active
Coil Resistance | Ohms | 0.5 ohms
Driver Bag Energy Reserve | Volts | 22 V
Driver Resistance | Ohms | 2.6 ohms
Driver Seat Belt | Buckled/Unbuckled | Buckled
Driver Senselo | Volts | 2.5 V
Driver VDIF | Millivolts | 4-10 mV
Ignition | Volts | 12 V
Lamp Driver Feedback | Active/Inactive | Active
Passenger Bag Energy Reserve | Volts | 22 V
Passenger Resistance | Ohms | 2.2 ohms
Passenger Senselo | Volts | 2.5 V
Passenger VDIF | Millivolts | 4-10 mV
SIR System Type | - | Driver/Passenger
Warning Lamp Cycles | Cycles | 0-125 Cycles
Warning Lamp Control | On/Off | Off