B1036

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 the SDM. Upon passing these tests the following circuits are measured to ensure that they are within their respective normal voltage ranges:
^ IGNITION 1
^ 23 VLR
^ Deployment loop voltages

Then the SDM proceeds to CONTINUOUS MONITORING. The SDM contains a resistor network connected to 5 volts, ground, and to the SDM front-end sensor signal terminal 9. The 1.0 K ohm 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 front-end sensor signal input. The SDM monitors this voltage to detect shorts to power or an open discriminating sensor.

Conditions for Setting the DTC
^ The SDM is configured for an Inflatable Restraint front end discriminating sensor
^ The voltage at front-end sensor signal terminal 9 is more than 5.0 volts for 500 milliseconds.

The CONTINUOUS MONITORING test inspects 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 turns ON the AIR BAG warning lamp.

Conditions for Clearing the DTC
^ Current DTC-The voltage at front-end sensor signal terminal 9 is less than 3.2 volts for 500 milliseconds.
^ History DTC
- You issue a scan tool CLEAR CODES command
- After 250 malfunction free ignition cycles have occurred

Diagnostic Aids
A broken or chafed wire in the Inflatable Restraint front end discriminating sensor circuit may cause an intermittent condition. Inspect circuit 349 and circuit 1751 carefully for cut or chafed wires.
When measurements are requested in this table, use the J 39200 DMM with the correct terminal adapter from the J 35616-A Connector Test Adapter kit. When an inspection for proper connection is requested, refer to Testing for Electrical Intermittents. When a wire, connector or terminal repair is requested, use the J 38125-B Terminal Repair Kit and refer to Wiring Repairs.

Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This test inspects for proper contact or corrosion of the yellow 2-way connector.
7. This test inspects for a malfunctioning discriminating sensor.
8. This test inspects for an open in circuit 1751.
11. This test isolates the open in circuit 1751 to one side of C114.
14. This test inspects for proper contact or corrosion of the Inflatable Restraint Sensing and Diagnostic Module (SDM) connector.
19. This test inspects for an open in circuit 349.
22. This test isolates the open in circuit 349 to one side of C114.
25. This test inspects for a short to voltage in circuit 349.