Circuit Description
The SDM contains a sensing device that converts vehicle velocity changes to
an electrical signal. The electrical signal is generated by the SDM and compared
to a value stored in memory. When the generated signals exceed the stored values,
the SDM deploys the air bags and stores a DTC in its memory.
DTC Parameters
DTC B0051 sets when the SDM commands the inflator modules to deploy air bags.
The following conditions must be met to set this DTC:
| • | Ignition voltage is present at the SDM and continuous. |
| • | The SDM detects a frontal or side crash. |
| • | Crash was of sufficient force to warrant deployment of air bags. |
Action Taken
| • | The air bag telltale will be ON. |
| • | DTC is latched in SDM memory. |
Diagnostic Aids
Important: DTC B0051 is a latched code and can not be cleared from SDM memory.
| • | Always start diagnosis of SIR DTCs with an inspection of vehicle, including
its wiring and SIR components for visible damage. |
| • | Always replace SDMs with DTC B0051 set, only after all collision repairs
have been completed. |
