R051

CIRCUIT DESCRIPTION
Closure of the dual pole arming sensor is detected when the voltage measured at "Driver Side High" terminal "A7" or at "Passenger Side High" terminal "A7" is within a specified amount of its respective deployment loop supply voltage. Closure of a 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 RO51 is set.

DTC 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. Conditions are monitored whenever the DERM is functioning normally.

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

DTC WILL CLEAR WHEN
A scan tool "Clear Codes" command is received by the DERM.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. When DTC RO42 and DTC RO51 are set simultaneously, perform DTC RO42 diagnosis first. R042
2. If inflator module(s) has not deployed, DTC RO51 may have set falsely.
3. If DTC RO51 has set with no signs of frontal impact, the diagnostic trouble code has set falsely.
4. This test checks for a DERM malfunction setting the diagnostic trouble code.
5. This test checks for a DERM malfunction setting the diagnostic trouble code.
6. This test determines whether the diagnostic trouble code was set inadvertently during diagnosis.
7. When a frontal crash has occurred, it is necessary to perform the indicated procedures to ensure the SIR system is fully functional.