Air Bag Systems

Circuit Description
When the ignition switch is turned to the ON position, the Inflatable Restraint Sensing and Diagnostic and Seat Belt Pretensioner Module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM monitors the firing loops to detect leakage currents to ground and system voltage in the Air Bag Inflator Module and Seat Belt Pretensioner circuits. The deployment loop resistances are measured to ensure they are within their respective normal resistance ranges. The SDM then goes into a Continuous Monitoring mode. The SDM service wait time is 1 minute. Refer to the ENABLE/DISABLE procedures.

Conditions for Setting the DTC
The SDM is installed in the vehicle in a unconfigured state. A replacement SDM must be programmed by the technician using a scan tool. This malfunction is detected immediately when the ignition switch is turned to the ON position.

Action Taken When the DTC Sets
^ The SDM sets a DTC 52.
^ The SDM turns ON the AIR BAG warning lamp.

Conditions for Clearing the DTC
Using the scan tool to configure the SDM will clear DTC 52.

Test Description
An example test description follows:
2. This step checks to see if the SDM is properly configured.
3. This step programs the SDM.