B1124

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. Upon passing these tests, the ignition positive voltage, 23 VLR and the deployment loop voltages are measured in order to ensure that the voltages are within their respective normal voltage ranges. The SDM monitors the voltages at the DRIVER LOW terminal 9 and the PASSENGER LOW terminal 8 in order to detect shorts to ground in the inflator module circuits.

Conditions for Setting the DTC
^ The driver and passenger deployment loops are not open.
^ The voltage at the DRIVER LOW terminal 9 or the PASSENGER LOW terminal 8 is less than 2.2 volts for 500 milliseconds.

The following tests inspect for this DTC. These tests occur when the ignition positive voltage is within the normal operating voltage range.
^ POWER-ON.
When the malfunction is detected in this test, the RESISTANCE MEASUREMENT test will not be performed.
^ CONTINUOUS MONITORING

Action Taken When the DTC Sets
^ The SDM sets a diagnostic trouble code.
^ The SDM commands the instrument cluster to turn ON the AIR BAG warning lamp.

Conditions for Clearing the MIL/DTC
The DTC will clear when one of the following conditions is met:
^ Current DTC.
The voltage measured at the DRIVER LOW and the PASSENGER LOW is above 2.2 volts for 500 milliseconds or 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 short-to-ground in the Inflatable Restraint Steering Wheel Module circuit or the passenger inflator module circuit may cause an intermittent condition. Moving wires while monitoring DRIVER SENSELO and PASSENGER SENSELO may help locate the fault. Carefully inspect the following circuits for cutting or chafing:
^ CKT 347.
^ CKT 348.
^ CKT 1403.
^ CKT 1404.

The diagnostic table directs the technician to note the entry value of the DRIVER SENSELO and the PASSENGER SENSELO. Noting the value of the DRIVER SENSELO and the PASSENGER SENSELO during diagnosis may be helpful in determining if an intermittent condition exists.

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. When a wire, connector or terminal repair is requested, use the J 38125-B Terminal Repair Kit. Refer to Wiring Repair. Intermittents and Poor Connections

Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This test determines the DRIVER LOW voltage measured by the Inflatable Restraint Sensing and Diagnostic Module (SDM) and if the malfunction is occurring now.
3. This test isolates the malfunction to one side of the Inflatable Restraint Steering Wheel Module Coil yellow 2-way connector.
4. This test determines whether the malfunction is due to the Inflatable Restraint Steering Wheel Module or the module coil.
7. This test determines whether the malfunction is in circuit 347.
8. This test determines whether the malfunction is in circuit 348.
11. This test isolates the malfunction to one side of the Inflatable Restraint Instrument Panel (IP) module, yellow 2-way connector.
13. This test determines whether the malfunction is in circuit 1403.
15. This test determines whether the malfunction is in circuit 1404.