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 the module. Next the SDM measures the ignition positive voltage and the deployment loop voltages in order to ensure that the voltages are within their respective normal voltage ranges. The SDM proceeds with the resistance measurement test. During 1 portion of the resistance measurement test, the SDM performs the following functions:

^ 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 the PASSENGER HIGH and the 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 I/P module

- Harness wiring of circuit 1403

- Harness wiring of circuit 1404

- Connector terminal contact

The resistance measurement test inspects for this malfunction. This test only occurs once each ignition cycle when the 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 Indicator.

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 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

The following conditions may cause an intermittent condition:

^ A short circuit between circuit 1403 and circuit 347

^ A short circuit between circuit 1403 and circuit 348

^ A short circuit between circuit 1403 and circuit 1404

^ A malfunctioning shorting bar on the Inflatable Restraint I/P module connector

The diagnostic table directs the technician in order to note the entry value of the PASSENGER RESISTANCE. Comparing the value of the

PASSENGER RESISTANCE over multiple ignition cycles may be helpful in determining if an intermittent condition exists.

When measurements are requested in this table, use J 39200 Digital Multi meter 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. 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 determines the deployment loop resistance measured by the Inflatable Restraint SDM.

6. This test isolates the malfunction to one side of the Inflatable Restraint Instrument Panel (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 to circuit 1404.

10. This test checks for a short from circuit 1403 to circuit 348.