DTC 54

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.

DTC WILL SET WHEN
The voltage difference between "Passenger Side High" terminal "A7" and "Passenger Side Low" terminal "B7" is above 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" is above a specified value.

ACTION TAKEN
DERM 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. 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.

DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a poor connection at DERM terminal "B7" or an open in CKT 1404A. The test for this diagnostic trouble code is run only 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.