Supplemental Inflatable Restraint (SIR)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the DERM grounds the "Driver Side Low" terminal "B8" and turns "ON" the passenger current source at the "Passenger Side High" terminal "A7." This causes a known amount of current to flow through the passenger initiator circuit. By monitoring the difference between the voltage at the "Passenger Side High" terminal "A7" and the "Passenger Side Low" terminal "B7" the DERM calculates the combined resistance of the passenger inflator module, passenger inflator module jumper, harness wiring CKTs 1403 and 1404 and connector terminal contact.

DTC WILL SET WHEN
The combined resistance of the passenger inflator module, harness wiring CKT 1403 and 1404 and connector terminal contact is below a specified value. This test is run once each ignition cycle during the "Initiator Assembly Resistance Test" when: 1) No "higher priority faults" are detected during "Turn-ON," 2) No "higher priority faults" are detected during "Continuous Monitoring" for one second, 3) No "Crank" signal present, 4) "Ignition 1" voltage is above a specified value.

ACTION TAKEN
DERM sets a diagnostic trouble code and sends a command to the instrument cluster to turn "ON" the "AIR BAG" warning lamp.

DTC WILL CLEAR WHEN
The ignition switch is turned "OFF"

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. DTC 16 and 22 will set simultaneously when the "Driver Side High" circuit is shorted to the "Passenger Side High" circuit due to parallel current paths.
2. This test determines whether the malfunction is in the passenger inflator module circuitry or in the DERM wiring harness circuitry.
3. This test checks for a short from the "Passenger Side High" circuit to the "Passenger Side Low" circuit and the "Driver Side Low" circuit.
4. This test determines whether the malfunction is due to the passenger inflator module or the passenger inflator jumper.

DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a short between CKT 1403 and CKT 347, CKT 348 or 1404 or a malfunctioning passenger inflator module. The test for this diagnostic trouble code is only run while the "AIR BAG" warning lamp is performing the bulb check. When a scan tool "Clear Codes" command is issued and the malfunction is still present, the DTC will not reappear until the next ignition cycle.