B1043

When measurements are requested in this table, use J 39200 Digital Multimeter with 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 in Diagrams. When a wire, connector or terminal repair is requested, use J 38125-A Terminal Repair Kit and refer to Wiring Repair.

CIRCUIT DESCRIPTION
During normal, non-deployment operation of the SIR System, the inflatable restraint Diagnostic Energy Reserve Module (DERM) monitors the voltage supplied through the inflatable restraint arming sensor to the high side of the driver deployment loop at the Driver Source Sense terminal AS. This measured voltage will have a value approximately equal to the Driver 36 VLR. When the voltage at the Driver Side Low terminal B8 measures in its normal operating range, indicating driver deployment loop integrity has been maintained and at the same time, the voltage the Driver Source Sense terminal AS measures at a specified amount below Driver 36 VLR for 500 milliseconds, DTC B1043 will set.

CONDITIONS FOR SETTING THE DTC
The DTC sets when the DERM measures simultaneously:
- The Driver Side Low terminal B8 voltage within a specified percentage of the Driver 36 VLR.
- The Driver Source Sense terminal AS voltage at a specified amount below the Driver 36 VLR for 500 milliseconds during Continuous Monitoring tests.

ACTION TAKEN WHEN THE DTC SETS
The DERM turns on the AIR BAG warning lamp and sets a diagnostic trouble code.

CONDITIONS FOR CLEARING THE DTC
The DTC clears when the DERM measures simultaneously:
1. The Driver Side Low terminal B8 voltage within a specified percentage of the Driver 36 VLR.
2. The Driver Source Sense terminal A5 voltage at a specified amount below the Driver 36 VLR for 500 milliseconds during Continuous Monitoring tests.

DIAGNOSTIC AIDS
One of the following situations may cause an intermittent condition:
- A poor connection to the DERM at terminal A5.
- A poor connection to the inflatable restraint arming sensor or inflatable restraint arming sensor jumper harness electrical connector at terminal C.
- An open or short to ground in the CKT 1400.
- A open inflatable restraint arming sensor.

TEST DESCRIPTION
Refer to step numbers on the diagnostic table.
1. Start at the SIR Diagnostic System Check for all diagnosis.
12. This test checks for an open in the Driver Source Sense circuit.
15. This test locates the open in the Driver Source Sense circuit.
18. This test checks for a short from the Driver Source Sense circuit-to-ground.
19. This test locates the short from the Driver Source Sense circuit-to-ground.
22. This test determines whether the malfunction is due to increased resistance across the Driver Source Sense resistor in the Arming Sensor.