Circuit Description
The inflatable restraint sensing and diagnostic module (SDM) contains sensing devices 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 inflator modules, deploying the air bags. DTC B0053 will set along with a DTC B0051 when a deployment occurs while an inflator circuit fault is present that could possibly result in a non-deployment situation in one or more inflator modules.
Conditions for Running the DTC
Ignition voltage must be present to the SDM.
Conditions for Setting the DTC
| • | The SDM detects a frontal crash, up to 30 degrees off the centerline of the vehicle, of sufficient force to warrant deployment of the frontal air bags. |
| • | The SDM detects a side impact crash of sufficient force to warrant deployment of a side air bag. |
Action Taken When the DTC Sets
| • | The SDM sets DTC B0051. |
| • | The SDM sets DTC B0053. |
| • | The SDM commands the AIR BAG warning lamp ON via Class 2 serial data. |
| • | The SDM records crash data. |
Conditions for Clearing the MIL/DTC
DTC B0053 is a latched code. You cannot clear a latched code. Replace the SDM after following the instructions in the diagnostic table.
Diagnostic Aids
DTC B0053 will be accompanied by another DTC (other than DTC B1000). Repair the malfunction causing the other DTCs before installing a new SDM.
Test Description
The following numbers refer to the step numbers in the diagnostic table:
-
If the inflator modules has not deployed, DTC B0053 may have set falsely.
-
If DTC B0053 has set with no signs of impact/collision, the DTC has set falsely.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check? | -- | ||
Does the vehicle show any signs of air bags deployment? | -- | |||
Inspect the vehicle and undercarriage for signs of impact/collision. Does the vehicle show any signs of impact/collision? | -- | |||
4 | Replace the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | -- | -- | |
5 | Replace all the components and perform inspections as required following an accident. Refer to Repairs and Inspections Required After a Collision . Did you complete the appropriate inspections and necessary repairs? | -- | -- | |
6 |
Did you complete the repair? | -- | -- |
