Supplemental Inflatable Restraint (SIR)

CIRCUIT DESCRIPTION
The voltage at "Sense Low" input, terminal "A6," is within a specific range of "36 VLR" output voltage when "36 VLR" output of the DERM is charged. Should the circuit short to ground between the "36 VLR" output and the diode in the arming sensor connected to terminal "B," "Ignition 1" voltage will be supplying the deployment loop. The voltage at the "Sense Low" input, terminal "A6," will decrease due to the lower supply voltage and DTC 32 will set after 700 milliseconds. DTC 32 indicates a short to ground in the wiring between the "36 VLR" output of the DERM and the arming sensor.

TEST CONDITIONS
Test every 100 milliseconds during "Continuous Monitoring."

FAILURE CONDITIONS
DTC 32 will set if the voltage at the "Sense Low" input, terminal "A6," is within a specific range of "Ignition 1" voltage for 700 milliseconds and DTC 42 is set.

ACTION TAKEN
DERM turns "ON" the "INFL REST" warning lamp.

CONDITIONS TO CLEAR
Current DTC 32 will clear if the voltage at the "Sense Low" input, terminal "A6," is within a specific range of "36 VLR" output voltage for 500 milliseconds.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks for a short from the "36 VLR" circuit to ground.
2. This test determines whether the malfunction is an internal short to ground in the arming sensor or a malfunction in the wiring harness.