DTC 83

Test AJ: DTC 83 Driver Reverse Diode Shorted:

Supplemental Inflatable Restraint (SIR):

OPERATION:
During the "Turn-ON" tests, performed at the beginning of each ignition cycle, the DERM delays the charging of the "Driver 36 VLR" and "Passenger 36 VLR" power supplies. While the delay is active the DERM measures the voltage at the "Driver 36 VLR" terminal "A4", "Passenger 36 VLR" terminal "A3", "Driver Source Sense" terminal "A5", and "Passenger Source Sense" terminal "A6." 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.

Test Conditions: Tested once each ignition during the "Turn-ON" test while the "36 VLR Delay" is active.

Failure Conditions: History DTC 83 is 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.

Action Taken: DERM sets a History Diagnostic Trouble Code.

Conditions to Clear: History DTC 83 will clear when the voltage measured at "Driver 36 VLR" terminal "A4" indicated that the power supply is in a discharged state during "Turn-ON" tests.

POSSIBLE CAUSES:
Test Description: Number(S) below refer to circled number(S) on the diagnostic chart.
1. This test determines if the malfunction is due to a shorted Driver Reserve Diode within the Dual Pole Arming Sensor.

DIAGNOSTIC AIDS:
This diagnostic trouble code will not set as a current DTC. Therefore follow the DTC chart to diagnose a history DTC 83.