DTC 43

Test X: DTC 43 Driver Source Feed Low:

Supplemental Inflatable Restraint (SIR):

OPERATION:
During normal, non-deployment operation of the SIR system, the DERM monitors the voltage supplied through the Dual Pole Arming Sensor to the high side of the Driver Deployment Loop at the "Driver Source Sense" terminal "A5." This measured voltage will have a value approximately equal to "Driver 36 VLR." When the voltage measured at "Driver Side Low" terminal "B8" is in its normal operating range, indicating Driver Deployment Loop integrity has been maintained, while simultaneously the voltage measured at "Driver Source Sense" is a specified amount below "Driver 36 VLR" for 500 milliseconds DTC 43 is set.

Test Conditions: Tested every 100 milliseconds during the "Continuous Monitoring" tests.

Failure Conditions: DTC 43 will set when the voltage measured at "Driver Side Low" terminal "B8" is within a specified percentage of "Driver 36 VLR" while simultaneously the voltage measured at "Driver Source Sense" terminal "A5" is a specified amount below "Driver 36 VLR" for 500 milliseconds.

Action Taken: DERM turns "ON" the "INFLATABLE RESTRAINT" warning lamp and sets a Diagnostic Trouble Code.

Conditions to Clear: DTC 43 will clear when the voltage measured at "Driver Side Low" terminal "B8" is within a specified percentage of "Driver 36 VLR" while simultaneously the voltage measured at "Driver Source Sense" terminal "A5" is within a specified amount of "Driver 36 VLR" for 500 milliseconds.

POSSIBLE CAUSES:
Test Description: Number(S) below refer to circled number(S) on the diagnostic chart.
1. This test checks for an open in "Driver Source Sense" circuit.
2. This test checks for a short from the "Driver Source Sense" circuit to ground.
3. The test determines if the malfunction is due to increased resistance across the "Driver Source Sense" resistor in the Dual Pole Arming Sensor.

DIAGNOSTIC AIDS:
An intermittent condition is likely to be caused by a poor connection to the DERM at terminal "A5," a poor connection to the dual pole arming sensor at terminal "D," an open or short to ground in CKT 1400 or a shorted dual pole arming sensor.