B1151

CIRCUIT DESCRIPTION
The Inflatable Restraint Sensing And Diagnostic Module (SDM) contains a sensing device that convert' vehicle velocity changes to an electrical signal. The SDM processes the generated electrical signal and compares it 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 signals stored in memory. When two of the generated signals exceed the stored values, the SDM will cause current to flow through the frontal inflator modules. This deploys the air bags and causes DTC B1151 and B1152 to set.

CONDITIONS FOR RUNNING THE DTC
Ignition voltage must be present.

CONDITIONS FOR SETTING THE DTC
Ignition voltage must be present and the SDM must have commanded an air bag deployment.

ACTION TAKEN WHEN THE DTC SETS
^ The SDM sets a DTC B1151 and DTC B1152.
^ The SDM commands the AIR BAG warning lamp ON via Class 2 serial data.
^ The SDM records the crash data.

CONDITIONS FOR CLEARING THE DTC
A scan tool CLEAR DTCs command is received by the SDM.

TEST DESCRIPTION

Steps 1-7:

The following numbers refer to the step numbers in the diagnostic table:
3. If the inflator modules has not deployed, DTC B1151 and B1152 may have set falsely.
4. If DTC B1151 and B1152 has set with no signs of impact/collision, the DTC has set falsely.