B1036

CAUTION: Be careful when you handle a sensor. Do not strike or jolt a sensor. Before applying power to a sensor:
^ Remove any dirt, grease, etc. from the mounting surface.
^ Position the sensor horizontally on the mounting surface.
^ Point the arrow on the sensor toward the front of the vehicle.
^ Tighten all of the sensor fasteners and sensor bracket fasteners to the specified torque value.
Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

When measurements are requested in this table, use J 39200 DMM 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 2. The 8.45K 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 sensor feed 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 a inflatable restraint front end discriminating sensor.
^ The voltage at SENSOR FEED terminal 2 is more than 4.5 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 turns ON the AIR BAG warning lamp.

CONDITIONS FOR CLEARING THE DTC
^ Current DTC.
- The voltage at SENSOR FEED terminal 2 is less than 4.5 volts for 500 milliseconds.
^ History DTC.
- You issue a scan tool CLEAR CODES command.
- 250 malfunction free ignition cycles have occurred.

DIAGNOSTIC AIDS
A broken or chafed wire in the inflatable restraint front end discriminating sensor circuit can cause an intermittent condition. Inspect CKT GR and CKT GR/B carefully for cutting or chafing.

DTC TABLE TEST DESCRIPTION
Numbers below refer to step numbers on the diagnostic table.
2. This test checks for proper contact and/or corrosion of the yellow 2-way connector.
7. This test checks for a malfunctioning discriminating sensor.
8. This test checks for an open in CKT GR/B.
10. This test checks for proper contact and/or corrosion of the inflatable restraint Sensing and Diagnostic Module (SDM) connector.
15. This test checks for an open m CKT GR.
17. This test checks for a short to voltage in CKT GR.