R016

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
When the ignition switch is turned "ON," the SDM will perform tests to diagnose critical malfunctions within itself. Upon passing these tests "Ignition 1," 36 VLR, and deployment loop voltages are measured to ensure they are within their respective normal voltage ranges. The SDM then proceeds with the "Current Source Diagnostics." "Passenger Side Low" terminal "A5" is grounded through a resistor and the passenger current source connected to "Passenger Side High" terminal "A6" allows a known amount of current to flow. By monitoring the voltage difference between "Passenger Side High" and "Passenger Side Low" the SDM calculates the combined resistance of the passenger inflator module, harness wiring CKTs 1403 and 1404 and connector terminal contact.

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

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

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 RO16 and RO22 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 SDM wiring harness circuitry.
3. This test checks for a short from the "Passenger Side High" circuit to the "Passenger Side Low" circuit.
4. This test checks for a short from the "Passenger Side High" circuit to the "Driver Side Low" circuit.

DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a short between CKT 1403 and CKT 347, CKT 348 or CKT 1404, or a malfunctioning shorting bar on the passenger inflator module which would require replacement of the module. The test for this diagnostic trouble code is only run while "AIR BAG" warning lamp is performing the bulb check, unless DTC RO17 or DTC RO26 is detected. 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.