Supplemental Inflatable Restraint (SIR)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the DERM grounds the "Passenger Side Low" terminal "B7" and measures the voltage at "Driver Source Sense" terminal "A5," "Passenger Source Sense" terminal "A6" and "Driver Side Low" terminal "B8." The DERM monitors "Driver Source Sense" to ensure that "Driver 36 VLR" is fully charged and supplying voltage to the high side of the driver deployment loop. When this condition is met, the measurement at "Passenger Source Sense" indicates no voltage is being supplied to the high side of the passenger deployment loop and grounding "Passenger Side Low" does not ground "Driver Side Low," DTC 55 is set.

DTC WILL SET WHEN
The conditions described above indicate a driver only DERM has been installed in the vehicle. 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 turns "ON" the "AIR BAG" warning lamp and sets a diagnostic trouble code.

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