B0053

CIRCUIT DESCRIPTION
The Inflatable Restraint Sensing And Diagnostic Module (SDM) contains a sensing device that converts vehicle velocity changes into an electrical signal. The SDM compares this electrical 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 two of the generated signals exceed the stored values, the SDM will cause current to flow through the inflator modules, deploying the air bags. Diagnostic trouble code (DTC) B0053 will set instead of DTC B0051 when a deployment occurs while an inflator circuit malfunction is present that could possibly result in a non-deployment situation in one or both inflator modules.

CONDITIONS FOR RUNNING THE DTC
Ignition 1 Voltage is within the normal operating voltage range.

CONDITIONS FOR SETTING THE DTC
^ The SDM detects a frontal crash of sufficient force to warrant deployment of the frontal air bags.
^ A deployment loop malfunction exists.

ACTION TAKEN WHEN THE DTC SETS
^ The SDM commands the AIR BAG indicator ON.
^ The SDM records crash data.

CONDITIONS FOR CLEARING THE DTC
DTC B0053 is a latched code which cannot be cleared. Replace the SDM after following the instructions in the diagnostic table.

DIAGNOSTIC AIDS
DTC B0053 will be accompanied by another DTC. Repair the malfunction causing the other DTC before installing a new SDM.

TEST DESCRIPTION

Steps 1-6: