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. If a deployment occurs
while an inflator circuit fault is present this DTC will be set.
DTC Parameters
DTC B0053 sets when the SDM commands the inflator modules to deploy air bags
with a loop fault present. The following conditions must be met to set this DTC:
| • | Ignition voltage is present at the SDM and continuous. |
| • | An inflator loop fault was previously detected. |
| • | 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 B0053 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 B0053 set, only after all collision repairs
have been completed. |
