Part 2 of 2

Test U: DTC 35 Discriminating Sensor Open Or Missing (Part 2 Of 2):

Supplemental Inflatable Restraint (SIR):

OPERATION:
During normal, non-deployment operation of the SIR system, a small amount of current flows through both the Driver and Passenger Deployment Loops. The diagnostic resistors within the Dual Pole Arming Sensor and the Discriminating Sensors along with the resistance of the inflator modules cause voltage drops within the Deployment Loops. The DERM monitors the voltage at "Driver Side Low" terminal "B8" and "Passenger Side Low" terminal "B7" to detect shorts or opens within the Deployment Loops. When the measured voltage at either terminal is within a specified percentage of its respective "36 VLR" power supply for 500 milliseconds DTC 35 is set.

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

Failure Conditions: DTC 35 will set when the voltage measured at "Driver Side Low" terminal "B8" or at "Passenger Side Low" terminal "B7" is within a specified percentage of its respective "36 VLR" power supply voltage for 500 milliseconds.

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

Conditions to Clear: DTC 35 will clear when the voltages measured at "Driver Side Low" terminal "B8" and "Passenger Side Low" terminal "67" are both above or below the percentage of their respective "36 VLR" power supply which sets DTC 35.

POSSIBLE CAUSES:
Test Description: Number(S) below refer to circled number(S) on the diagnostic chart.
8. This test checks for increased resistance of the diagnostic resistor in the LH mid-rail discriminating sensor.
9. This test checks for an open ground feed to the LH mid-rail discriminating sensor.
10. This test checks for a high resistance between the driver inflator module and the LH mid-rail discriminating sensor.
11. This test determines whether the malfunction is due to decreased resistance of the diagnostic resistors in the dual pole arming sensor.

DIAGNOSTIC AIDS:
An Intermittent condition is likely to be an improper connection at any of the discriminating sensor terminals, an open in either ground feed to the discriminating sensors, an open discriminating sensor interconnect circuit, increased resistance of any discriminating sensor or decreased resistance of the dual pole arming sensor.