DTC 19

Passenger Initiator Circuit Voltage High:

Wiring Schematic:

CIRCUIT DESCRIPTION
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.

DTC 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. This test is run every 100 milliseconds during the "Continuous Monitoring" tests.

ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamp and sets a diagnostic trouble code.

DTC WILL CLEAR WHEN
The voltage measured at "Passenger Side Low" terminal "B7" is within a specified percentage of "Passenger 36 VLR" for 500 milliseconds.

DTC CHART 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 jumper harness connector and the discriminating sensor interconnect.
2. This test checks for decreased resistance in the driver side diagnostic resistors of the dual pole arming sensor.
3. This test checks for decreased resistance in the passenger side diagnostic resistors of the dual pole arming sensor.
4. This test checks for a short from the high side of the driver deployment loop to "Driver 36 VLR."
5. This test determines whether the malfunction is an open in CKT 348E.
6. This test checks for a short from the high side of the driver deployment loop to "Passenger 36 VLR."
7. This test checks for a short from the high side of the driver deployment loop to "Driver Source Sense."
8. This test checks for a short from the high side of the driver deployment loop to "Passenger Source Sense."
9. This test checks for a short from the high side of the passenger deployment loop to "Driver 36 VLR."
10. This test checks for a short from the high side of the passenger deployment loop to "Passenger 36 VLR."
11. This test checks for a short from the high side of the passenger deployment loop to "Driver Source Sense."
12. This test checks for a short from the high side of the passenger deployment loop to "Passenger Source Sense."
13. This test checks for a short from the low side of the deployment loops to "Driver 36 VLR."
14. This test checks for a short from the low side of the deployment loops to "Passenger 36 VLR."
15. This test checks for a short from the low side of the deployment loops to "Driver Source Sense."
16. This test checks for a short from the low side of the deployment loops to "Passenger Source Sense."
17. This test checks for increased resistance of the diagnostic resistor in the forward discriminating sensor.
18. This test determines whether the malfunction is increased resistance of the diagnostic resistor in the passenger compartment 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.

An intermittent condition is likely to be caused by backed out/shorted terminals on the arming sensor harness connector, poor connection at any of the discriminating sensor terminals, a short from CKT 236 or CKT 1401 to CKT 347, CKT 348, CKT 1403, a short from CKT 1400 or CKT 1837 to CKT 347, CKT 348, or CKT 1403.