Part 1 of 5

Test J: DTC 19 Passenger Initiator Circuit Voltage High (Part 1 Of 5):

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 "Passenger Side Low" terminal "B7" to detect shorts or opens within the passenger deployment loop. When the measured voltage is above a specified percentage of "Passenger 36 VLR" for 500 milliseconds DTC 19 is set.

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

Failure Condition: DTC 19 will set when the voltage measured at "Passenger Side Low" terminal "B7" is above a specified percentage of "Passenger 36 VLR" for 500 milliseconds and DTC 35 is not set.

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

Conditions to Clear: DTC 19 will clear when the voltage measured at "Passenger Side Low" terminal "B7" is within a specified percentage of "Passenger 36 VLR" for 500 milliseconds.

POSSIBLE CAUSES:
Test Description: Number(S) below refer to circled number(S) on the diagnostic chart.
1. DTC 19 and 24 together means that there is an open between the Passenger Inflator Module Harness Connector and the discriminating sensor interconnect.
2. This test determines whether the malfunction is an open in the forward discriminating sensor.
3. This test checks for an open in CKT 1751F.
4. This test checks for an open in CKT 1751G.
5. This test checks for high resistance in CKT 348E.
6. This test determines whether the malfunction is increased resistance of the diagnostic resistor in the RH mid-rail discriminating sensor.

DIAGNOSTIC AIDS:
An open between the passenger inflator module and the forward discriminating sensor causes the voltage to increase at "Passenger Side Low" due to the loss of a ground path. This also causes the voltage to decrease at "Driver Side Low" due to decreased current flow through the discriminating sensor network. For additional information, refer to Diagnostic Aids for Test J (part 5 of 5). Part 5 of 5