B1131

Circuit Description
When you first turn the ignition switch to the ON position, the Inflatable Restraint Sensing and Diagnostic Module (SDM) perform tests in order to diagnose critical malfunctions within itself. Next the SDM measures Ignition 1 and the deployment loop voltages in order to ensure that 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 Pretensioner Low terminal 11 through an internal current sink.
^ Connects the Passenger Pretensioner High terminal 12 to an internal constant current source. This current produces proportional voltage drops in the deployment loop.
^ Measures the voltage difference between Passenger Pretensioner High and Passenger Pretensioner Low.
^ Calculates the resistance of the passenger pretensioner deployment loop using the measured voltage.

Conditions for Setting the DTC
^ The passenger and driver pretensioner deployment loops are not open.
^ The passenger and driver pretensioner deployment loops are not shorted to voltage.
^ The passenger and driver pretensioner deployment loops are not shorted to ground.
^ The passenger pretensioner deployment loop resistance is more than 3.1 ohms. The passenger pretensioner deployment loop consists of the following components:
- Passenger seat belt pretensioner.
- Harness wiring of circuit 2116.
- Harness wiring of circuit 2117.
- 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 (DTC).
^ The SDM commands the instrument cluster (IPC) to turn ON the AIR BAG warning lamp.

Conditions for Clearing the MIL/DTC
^ Current DTC
The resistance of the passenger pretensioner deployment loop is less than 3.1 ohms and the ignition switch is cycled.
^ History DTC
- You issue a scan tool Clear DTCs command.
- Once 250 malfunction free ignition cycles have occurred.

When you issue a scan tool Clear DTCs 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. Inspect the following for a poor connection:
^ The side air bag/pretensioner yellow 6-way harness connector terminals A and F.
^ The SDM terminals 12 and 11.
^ The wire to terminal connections in circuit 2116.
^ The wire to terminal connections in circuit 2117.

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

Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This test checks for proper contact or corrosion of the side air bag/pretensioner yellow 6-way connector.
9. This test isolates the malfunction to one side of the side air bag/pretensioner yellow 6-way connector.
10. This test determines if the malfunction is in the jumper harness or the pretensioner.
13. This test checks for proper contact or corrosion of the SDM connector.
18. This test determines whether the malfunction is in circuit 2116.
20. This test determines whether the malfunction is in circuit 2117.