Supplemental Inflatable Restraint (SIR)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
During the "Continuous Monitoring" tests the DERM monitors the voltage at "Driver Source Sense" terminal "A5." When the circuit is operating normally the measured voltage will be slightly less than "Driver 36 VLR." If the "Driver 36 VLR" circuit opens the voltage measured at "Driver Source Sense" will decrease to slightly less than "Ignition 1" voltage. When the voltage measured at "Driver Source Sense" is within a specified range of "Ignition 1" for 500 milliseconds DTC 31 is set.

DTC WILL SET WHEN
The voltage measured at "Driver Source Sense" terminal "A5" is within a specified range of "Ignition 1" for 500 milliseconds during "Continuous Monitoring."

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

DTC WILL CLEAR WHEN
The voltage measured at "Driver Source Sense" terminal "A5" is outside the specified range of "Ignition 1" which sets the diagnostic trouble code, for 500 milliseconds.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks for an open in the "Driver 36 VLR" circuit.
2. This test checks for high resistance, but not an open, in the "Driver Source Sense" circuit.
3. This test checks for a short from the "Driver Source Sense" circuit to B+.

DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a poor connection at arming sensor terminal "B" or "C," poor connection at DERM terminal "A4" or "A5," an open in CKT 236 or CKT 1400, or an open inside the arming sensor.