Diagnostic Instructions
DTC Descriptor
DTC B0053 : Deployment Commanded with Loop DTCs Present
Circuit/System Description
The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device that converts changes in vehicle velocity to an electrical signal. The SDM compares this 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 2 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 instead of DTC B0051 when a deployment occurs while an inflator circuit fault is present that may result in a non-deployment situation in one or more of the inflator modules.
Conditions for Running the DTC
The SDM must be powered up.
Conditions for Setting the DTC
Ignition voltage must be present and the SDM must have commanded an air bag deployment with faults present.
Action Taken When the DTC Sets
| • | The SDM commands the AIR BAG indicator ON via class 2 serial data. |
| • | The SDM records crash data. |
Conditions for Clearing the DTC
DTC B0053 is a latched code. You cannot clear a latched code. Replace the SDM after following the instructions in the circuit/system testing.
Diagnostic Aids
When DTC B0053 is accompanied by additional DTCs (other than DTC B0051), repair the malfunction causing the other DTCs before replacing the SDM.
Reference Information
Schematic Reference
SIR Schematics
Connector End View Reference
SIR Connector End Views
Electrical Information Reference
Circuit/System Testing
| • | If there are signs of an air bag deployment inspect the vehicle for signs of impact or collision. Replace all components as required after an accident. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
