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R019


















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 e voltage at "Passenger Side Low terminal "B?" 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 RO19 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 RO35 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. This test determines whether the malfunction is in the RH discriminating sensor.
2. This test checks for an open between the passenger inflator module and the RH discriminating sensor.
3. DTC RO19 and RO24 together means that there is an open between the passenger inflator harness connector and the discriminating sensor interconnect.
4. This test checks for an open ground feed to the RH discriminating sensor.
5. This test checks for a high resistance in the RH and LH discriminating sensor interconnect circuitry.
6. This test checks for an open in the LH discriminating sensor between terminal "A" and the splice.
7. this test determines whether the malfunction is increased resistance of the diagnostic resistor in the RH discriminating sensor.
8. This test checks for an open between the forward discriminating sensor an the LH discriminating sensor.
9. This test checks for an open between the forward discriminating sensor an the LH discriminating sensor
10. This test checks for an open in the LH discriminating sensor between terminal "C" and the splice.
11. This test checks for an open ground feed to the LH discriminating sensor.
12. This test determines whether the malfunction is increased resistance of the diagnostic resistor in the forward discriminating sensor.
13. This test checks for decreased resistance in the driver side diagnostic resistors of the dual pole arming sensor.
14. This test checks for a short from the high side of the driver deployment loop to "Driver6 VLR."
15. This test checks for a short from the hi h side of the driver deployment loop to "Passenger 36 VLR."
16. This test checks for a short from the high side of the driver deployment loop to "Driver Source Sense".
17. This test checks for a short from the high side of the loop to the "Passenger Source Sense."
18. This test checks for a short from the low side o1f the driver deployment loop to "Driver 36 VLR."
19. This test checks for a short from the low side of the driver deployment loop to "Passenger 36 VLR."
20. This test checks for a short from the low side of the driver deployment loop to "Driver Source Sense."
21. This test checks for a short from the low side of the driver deployment loop to the "Passenger Source Sense."
22. This test checks for decreased resistance in the passenger diode diagnostic resistors of the dual pole arming sensor.
23. This test checks for a short from the high side of the passenger deployment loop to "Passenger 36 VLR."
24. This test checks for a short from the high side of the passenger
deployment loop to "Passenger 36 VLR."
25. This test checks for a short from the high side of the passenger deployment loop to "Driver Source Sense."
26. This test checks for a short from the hi h side of the passenger deployment loop to "Passenger Source Sense."
27. This test checks for a short from the low side of the passenger deployment loop to "Driver Source Sense."
28. This test checks for a short from the low side of the passenger deployment loop to "Passenger Source Sense."
29. This test checks for a short from the low side of the passenger deployment loop to "Driver 36 VLR."
30. This test checks for a short from the low side of the passenger deployment loop to "Passenger 36 VLR."

DIAGNOSTIC AIDS
An open between the passenger inflator module and the forward discriminating sensor causes the voltage to increase at "Passenger Ride 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 dual pole arming sensor harness connector, poor connection at any 0 the discriminating sensor terminals, a short from CKT 236 or 1401 to CKT 347, CKT 348, CKT 1403 or CKT 1404, a short from CKT 1400 or CKT 1837 to CKT 347, or CKT 1403, or an 0 en or high resistance in CKT 1404B, CKT 349 or CKT 751.



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