B0051
DTC B0051CIRCUIT DESCRIPTION
The inflatable restraint Sensing and Diagnostic Module (SDM) contains a sensing device that converts vehicle velocity changes into an electrical signal. The SDM compares this electrical signal to a value stored in memory. When the generated signal exceeds the stored value, the SDM performs additional signal processing and compares the generated signals to values stored in memory. When two of the generated signals exceed the stored values, the SDM will cause current to flow through the deployment loops, deploying the air bags and/or pretensioners causing DTC B0051 to set.
IMPORTANT: The seat belt pretensioners may deploy for impacts that are not severe enough to warrant frontal or side air bag deployment. The SDM is capable of sustaining 3 pretensioner deployment events, or 1 frontal or side deployment event. After the maximum number of deployments has occurred, DTC B0051 becomes a latched code, which cannot be cleared.
CONDITIONS FOR RUNNING THE DTC
Ignition 1 voltage must be within the normal operating range.
CONDITIONS FOR SETTING THE DTC
The DTC will set if one of the following conditions occurs.
- The SDM detects a frontal impact of sufficient force to warrant deployment of the frontal inflator modules and/or pretensioners.
- The SDM detects a side impact of sufficient force to warrant deployment of a roof rail inflator module.
ACTION TAKEN WHEN THE DTC SETS
- The SDM commands the AIR BAG warning lamp ON via Class 2 serial data.
- The SDM records crash data.
CONDITIONS FOR CLEARING THE DTC
DTC B0051 can be cleared if the following conditions are met.
- Three consecutive seat belt pretensioner deployment events have not occurred
- One frontal or side air bag deployment has not occurred.
- The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
- A history DTC will clear once 255 malfunction free ignition cycles have occurred.
DTC B0051 becomes a latched code after 3 consecutive pretensioner deployments or 1 frontal or side air bag deployment. You cannot clear a latched code. Replace the SDM after following the instructions in the diagnostic table.
TEST
