B1019

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. Upon passing these tests Ignition Positive Voltage, 23 VLR and the deployment loop voltages are measured in order to ensure they are within the normal voltage ranges. The SDM monitors the voltages at Driver Low terminal 3 and Passenger Low terminal 4 in order to detect shorts to voltage in the inflator module circuits.

Conditions for Setting the DTC
^ The voltage at Driver Low terminal 3 is less than 4.8 volts.
^ The voltage at Passenger Low terminal 4 is more than 4.8 volts for 500 milliseconds.

The Continuous Monitoring test checks for this DTC. This test occurs 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 voltage at Passenger Low terminal 4 is less than 4.8 volts for 500 milliseconds.
^ History DTC
- You issue a scan tool Clear DTCs command.
- 250 ignition cycles have passed since the last malfunction.

Diagnostic Aids
A short to voltage in the Inflatable Restraint Instrument Panel (IP) module circuit may cause an intermittent condition. Carefully inspect circuit 1403 and circuit 1404 for cutting or chafing. Wiring pigtail damage requires replacement of the Inflatable Restraint IP module. The diagnostic table directs the technician to note the entry value of Passenger Senselo. Comparing the value of Passenger Senselo 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 Diagnosis in Wiring Systems. When a wire, connector or terminal repair is requested, use the J 38125-B Terminal Repair Kit. Refer to Wiring Repairs in Wiring Systems.

Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This test determines the passenger low voltage measured by the Inflatable Restraint Sensing and Diagnostic Module (SDM).
3. This test isolates the malfunction to one side of the Inflatable Restraint IP module yellow 2-way connector.
5. This test determines whether the malfunction is in circuit 1403 (WHT/BLK).
7. This test determines whether the malfunction is in circuit 1404 (DK GRN/WHT).