Supplemental Inflatable Restraint (SIR)

Wiring Diagram:

CIRCUIT DESCRIPTION
During the "Turn-ON" tests, performed at the beginning of each ignition cycle, the DERM delays the charging of the "Driver 36 VLR" power supply. While the delay is active the DERM measures the voltage at the "Driver 36 VLR" terminal "A4," and "Driver Source Sense" terminal "A5." When the driver reserve diode is shorted "Ignition 1 "voltage is measured at "Driver 36 VLR" from the forward biased driver ignition diode. When the voltage measured at "Driver 36 VLR" is within a specified range of "Ignition 1" voltage for eight consecutive "Turn-ON" tests History DTC 83 is set.

DTC WILL SET WHEN
The voltage measured at "Driver 36 VLR" terminal "A4" is within a specified range of "Ignition 1" voltage for eight consecutive "Turn-ON" tests and no "higher priority faults" are detected. This test is run once each ignition during the "Turn-ON" test while the "36 VLR delay" is active.

ACTION TAKEN
DERM sets a history diagnostic trouble code.

DTC WILL CLEAR WHEN
The voltage measured at "Driver 36 VLR" terminal "A4" indicated that the power supply is in a discharged state (measured voltage equals zero) during "Turn-ON" tests.

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 shorted driver reserve diode within the arming sensor.

DIAGNOSTIC AIDS
This diagnostic trouble code will not set as a current DTC. Therefore follow the DTC table to diagnose this malfunction.