DTC 51

Test Z: DTC 51 Frontal Crash Detected:

Supplemental Inflatable Restraint (SIR):

OPERATION:
Closure of the Dual Pole Arming Sensor is detected when the voltage measured at "Driver Side High" terminal "B9" 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 Condition: 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 "INFLATABLE RESTRAINT" warning lamp and 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.

POSSIBLE CAUSES:
Test Description: Number(S) below refer to circled number(S) on the diagnostic chart.
1. When DTC 42 and DTC 51 are set simultaneously, perform DTC 42 diagnosis first.
2. If inflator module(S) has not deployed, DTC 51 may have set falsely.
3. If DTC 51 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.