B1135

When measurements are requested in this table, use J 39200 DVM with the correct terminal adapter from J 35616-A Connector Test Adapter Kit. When a check for proper connection is requested, refer to Intermittents and Poor Connections in Diagram Information in Diagrams. When a wire, connector, or terminal repair is requested, use J 38125-A Terminal Repair Kit and refer to Wiring Repair.

CIRCUIT DESCRIPTION
When you first turn the ignition switch to the RUN position, the inflatable restraint Sensing and Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within itself. Next the SDM measures IGNITION 1, 23 VLR, and the deployment loop voltages to make sure they are within their respective. normal voltage ranges. Then the SDM proceeds to CONTINUOUS MONITORING. The SDM contains a resistor network connected to 5 volts, ground, and to the SDM sensor signal terminal 4. The 1.0 K OHMS resistor in the inflatable restraint front end discriminating sensor parallel to the normally open switch provides a parallel path to ground. This causes a specified percentage of voltage to appear at the SDM sensor feed input. The SDM monitors this voltage to detect shorts to ground or a closed discriminating sensor.

CONDITIONS FOR SETTING THE DTC
^ The SDM is configured for a inflatable restraint front end discriminating sensor.
^ The voltage at SENSOR FEED terminal 4 is less than 0.7 volts for 500 milliseconds.

The CONTINUOUS MONITORING test checks for this DTC. This test occurs when IGNITION 1 is within the normal operating voltage range.

ACTION TAKEN WHEN THE DTC SETS
^ The SDM sets a diagnostic trouble code.
^ The SDM commands the Instrument Panel Cluster (IPC) to turn ON the AIR BAG warning lamp.

CONDITIONS FOR CLEARING THE DTC
^ Current DTC.
The voltage at SENSOR FEED terminal 4 is more than 0.7 volts for 500 milliseconds.
^ History DTC.
- You issue a scan tool CLEAR CODES command.
- 250 malfunction-free ignition cycles have occurred.

DIAGNOSTIC AIDS
A short-to-ground in the inflatable restraint front end discriminating sensor circuit can cause an intermittent condition. Inspect CKT 349 carefully for cutting or chafing.

DTC TABLE TEST DESCRIPTION
Number below refer to step number on the diagnostic table.
2. This test checks for a malfunctioning discriminating sensor.
4. This test checks for a short-to-ground in CKT 349.