DTC 44

Test Y: DTC 44 Passenger 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 Passenger Deployment Loop at the "Passenger Source Sense" terminal "A6." The measured voltage will have a value approximately equal to "Passenger 36 VLR." When the voltage measured at "Passenger Side Low" terminal "B7" is in its normal operating range, indicating Passenger Deployment Loop integrity has been maintained, while simultaneously the voltage measured at "Passenger Source Sense" is a specified amount below "Passenger 36 VLR" for 500 milliseconds DTC 44 is set.

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

Failure Conditions: DTC 44 will set when the voltage measured at "Passenger Side Low" terminal "B7" is within a specified percentage of "Passenger 36 VLR" while simultaneously the voltage measured at "Passenger Source Sense" terminal "A6" is a specified amount below "Passenger 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 44 will clear when the voltage measured at "Passenger Side Low" terminal "B7" is within a specified percentage of "Passenger 36 VLR" while simultaneously the voltage measured at "Passenger Source Sense" terminal "A6" is within a specified amount of "Passenger 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 the "Passenger Source Sense" circuit.
2. This test checks for a short from the "Passenger Source Sense" circuit to ground.
3. This test determines if the malfunction is due to increased resistance across the "Passenger 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 "A6," a poor connection to the dual pole arming sensor at terminal "F," an open or short to ground in CKT 1837 or a shorted dual pole arming sensor.