B1016

Circuit Description
When you first turn the ignition switch to the RUN position, the Inflatable Restraint Sensing and Diagnostic Module (SDM) performs tests in order to diagnose critical malfunctions within itself. Next the SDM measures Ignition Positive Voltage and the deployment loop voltages in order to ensure they are within the normal voltage ranges. Then the SDM proceeds with the Resistance Measurement test. During one portion of the Resistance Measurement test, the SDM performs the following actions:
^ Grounds the Passenger Low terminal 4 through an internal current sink
^ Connects the Passenger High terminal 1 to an internal constant current source. This current produces proportional voltage drops in the deployment loop.
^ Measures the voltage difference between Passenger High and Passenger 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 less than 1.4 ohms. The passenger deployment loop consists of the following components:
- An Inflatable Restraint Instrument Panel (IP) module
- Harness wiring of circuit 1403 (WHT/BLK)
- Harness wiring of circuit 1404 (DK GRN/WHT)
- Connector terminal contact

The Resistance Measurement test checks for this malfunction. This test only occurs once each ignition cycle when Ignition Positive Voltage 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 MIL/DTC
^ Current DTC
The resistance of the passenger deployment loop is more than 1.4 ohms and the ignition switch is cycled.
^ History DTC
- You issue a scan tool Clear DTCs command.
- 250 ignition cycles have passed since the last malfunction.

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
The following condition may cause an intermittent condition:
^ A short circuit between circuit 1403 (WHT/BLK) and circuit 347 (WHT)
^ A short circuit between circuit 1403 (WHT/BLK) and circuit 348 (DK GRN)
^ A short circuit between circuit 1403 (WHT/BLK) and circuit 1404 (DK GRN/WHT)
^ A malfunctioning shorting bar on the Inflatable Restraint IP module connector

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

The diagnostic table directs the technician to note the entry value of Passenger Resistance. Comparing the value of Passenger Resistance over multiple ignition cycles may be helpful in determining if an intermittent condition exists.

Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This test determines the deployment loop resistance measured by the Inflatable Restraint Sensing and Diagnostic Module (SDM).
6. This test isolates the malfunction to one side of the Inflatable Restraint IP module yellow 2-way connector.
7. This test checks for proper contact or corrosion of the Inflatable Restraint IP module connector.
8. This test checks for a short from circuit 1403 (WHT/BLK) to circuit 1404 (DK GRN/WHT).
10. This test checks for a short from circuit 1403 (WHT/BLK) to circuit 348 (DK GRN/WHT).