DTC 54

Wiring Diagram:

CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the DERM grounds the "Passenger Side Low" terminal "B7" and turns "ON" the driver current source at the "Driver Side High" terminal "B9." This causes a known amount of current to flow through the driver initiator circuit allowing the resistance to be calculated. The normal, non-deployment current flow through the passenger deployment loop is also affected since the DERM is supplying ground through a resistor bypassing the ground supplied by the resistance of the discriminating sensor network. When the voltage difference between "Passenger Side High" terminal "A7" and "Passenger Side Low" terminal "B7" is above a specified value DTC 54 is set.

TEST CONDITIONS
Tested 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" is above a specified value.

FAILURE CONDITIONS
DTC 54 will set when the voltage difference between "Passenger Side High" terminal "A7" and "Passenger Side Low" terminal "B7" is above a specified value.

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

CONDITIONS TO CLEAR
DTC 54 will clear each time the ignition switch is turned "OFF."

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test determines whether the malfunction is due to a high resistance or open in the "Passenger Side Low" circuit between the DERM and the passenger inflator module harness connector or a malfunctioning DERM.