Supplemental Inflatable Restraint (SIR)

�<x Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
Closure of the dual pole arming sensor is detected when the voltage measured at "Driver Side High" terminal or at "Passenger Side High" terminal "A7" is within a specified amount of its respective deployment loop supply voltage. Closure of either discriminating sensor is detected when the voltage measured at "Driver Side Low" terminal "B8" or at "Passenger Side Low" terminal "B7" is within a specified amount of ground potential. When both conditions are met simultaneously on either the driver side or passenger side for not less than 250 microseconds "Crash Data" is recorded and DTC 51 is set

TEST CONDITIONS
Conditions are monitored whenever the DERM is functioning normally.

FAILURE CONDITIONS
DTC 51 will set when closure of the dual pole arming sensor and at least one of the discriminating sensors is detected for not less than 250 microseconds on either the driver side or passenger side.

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

CONDITIONS TO CLEAR
DTC 51 can only be cleared by using a scan tool "Clear Codes" command.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart
1. If inflator module(s)) has not deployed, DTC 51 may have set falsely.
2. If DTC 51 has set with no signs of frontal impact, the diagnostic trouble code has set falsely.
3. This test check's for a DERM malfunction setting the diagnostic trouble code.
4. This test determines whether the diagnostic trouble code was set inadvertently during diagnosis or by a DERM malfunction.
5. When a frontal crash has occurred, it is necessary to perform the indicated procedures to ensure the SIR system is fully functional.