DTC 55

Test AD: DTC 55 Derm Incompatibility:

Supplemental Inflatable Restraint (SIR):

OPERATION:
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.

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 1 second, 3) No "CRANK" signal present, 4) "Ignition 1" voltage is above a specified value.

Failure Conditions: DTC 55 will set when, with "Driver 36 VLR" supplying power to the high side of the Driver Deployment Loop, "Passenger Source Sense" indicates no voltage is being applied to the high side of the Passenger Deployment Loop and grounding "Passenger Side Low" does not ground "Driver Side Low."

Action Taken: DERM turns "ON" the "INFLATABLE RESTRAINT" warning lamp and sets a Diagnostic Trouble Code.

Conditions to Clear: DTC 55 will clear each time the ignition switch is turned "OFF."

POSSIBLE CAUSES:
A Driver only DERM installed in a Driver/Passenger system.