B1115

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 and the deployment loop voltages to make sure they are within their respective normal voltage ranges. Then the SDM proceeds with the RESISTANCE MEASUREMENT test. During one portion of the RESISTANCE MEASUREMENT test, the SDM does the following:
^ Grounds the PASSENGER FRONTAL LOW terminal 8 through an internal current sink.
^ Connects the PASSENGER FRONTAL HIGH terminal 7 to an internal constant current source. This current produces proportional voltage drops in the deployment loop.
^ Measures the voltage difference between PASSENGER FRONTAL HIGH and PASSENGER FRONTAL LOW.
^ Calculates the resistance of the passenger deployment loop using the measured voltage.

CONDITIONS FOR SETTING THE DTC
^ The driver and passenger deployment loops are not open.
^ The driver and passenger deployment loops are not shorted to voltage.
^ The passenger deployment loop is not shorted to ground.
^ The passenger deployment loop resistance is more than 3.0 OHM. The passenger deployment loop consists of the following components:
- Inflatable restraint I/P module.
- Harness wiring of CKT 1403.
- Harness wiring of CKT 1404.
- Connector terminal contact.

The RESISTANCE MEASUREMENT test checks for this malfunction. This test only occurs once each ignition cycle 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 resistance of the passenger deployment loop is less than 3.0 and the ignition switch is cycled.
^ History DTC.
- You issue a scan tool CLEAR CODES command.
- 250 malfunction-free ignition cycles have occurred.

When you issue a scan tool CLEAR CODES command and the malfunction is still present, the DTC will not reappear until the next ignition cycle.

DIAGNOSTIC AIDS
A poor connection can cause an intermittent condition. Check the following for a poor connection:
^ The inflatable restraint I/P module harness connector terminals A and B.
^ The SDM terminals 7 and 8.
^ The wire to terminal connections in CKT 1403.
^ The wire to terminal connections in CKT 1404.

DTC TABLE TEST DESCRIPTION
Number below refer to step number on the diagnostic table.
2. This test checks for proper contact and/or corrosion of the yellow 2-way connector.
9. This test isolates the malfunction to one side of the inflatable restraint I/P module, yellow 2-way connector. This is done by substituting the known good resistance of the load tool and then observing if the malfunction is still present.
11. This test checks for proper contact and/or corrosion of the inflatable restraint Sensing and Diagnostic Module (SDM) connector.
16. This test determines whether the malfunction is in CKT 1403.
18. This test determines whether the malfunction is in CKT 1404.