The scan tool used provides the following capabilities:
| • | Reads the data list. |
| • | Reads the current and history trouble codes. |
| • | Clears the diagnostic trouble codes after a repair is completed. |
Ensure that the scan tool contains the latest diagnostic information before attempting to communicate with the supplemental restraint system (SRS). In order to use the scan tool, connect the scan tool to the data link connector (DLC). Then, turn the ignition switch to the RUN position. The scan tool reads the serial data sent from the SDM serial data output terminal 5 to the DLC terminal 9.
The SRS Scan Tool Data List contains all restraint related parameters that are available on the scan tool. The list is arranged in the order that they appear on the scan tool.
Use the SRS Scan Tool Data List only after the following items are determined:
| • | The Diagnostic System Check is completed. |
| • | No diagnostic trouble codes (DTCs) are set. |
| • | The SRS Diagnostics indicates that the system is functioning properly. |
You may use the scan tool values from a properly operating system for comparison with the SRS you are diagnosing. The SRS Scan Tool Data List represents typical values seen on a properly operating system.
Important: Ensure that the scan tool that you are using is functioning properly. Use of a malfunctioning scan tool may 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.
Scan Tool Parameter | Units Displayed | Typical Data Value |
|---|---|---|
Ignition ON, Engine OFF, Supplemental Restraint IP Module Switch ON (if equipped), and Driver Seat Belt Buckled | ||
Ignition | Volts | 12 V |
Lamp Driver | Internal/External | Internal |
Driver Resistance | Ohms | 2.6 ohms |
Passenger Resistance | Ohms | 2.2 ohms |
Driver Senselo | Volts | 4.1 V |
Passenger Senselo | Volts | 4.1 V |
Driver VDIF | Millivolts | 4-8 mV |
Passenger VDIF | Millivolts | 4-8 mV |
Warning Lamp Control | On/Off | Off |
Lamp Driver Feedback | Active/Inactive | Inactive |
Warning Lamp ON | Hours | 0 - 182 Hrs |
Warning Lamp Cycles | Cycles | 0 - 125 Cycles |
Driver Seat Belt | Buckled/Unbuckled | Buckled |
Pass Air Bag Enable | High/Low | High |
Pass Air Bag Disable | High/Low | Low |
Suppression Lamp Driver | On/Off | Off |
