K 1500 Truck 4WD V8-4.8L VIN V (1999)
Air Bag Inflator Module: Description and Operation
The Inflator Modules consist of an inflatable bag and an inflator. An inflator consists of a canister of gas-generating material and an initiating device.
The initiator is part of the deployment loop. When the vehicle is in a frontal crash of sufficient force, the Inflatable Restraint Sensing and Diagnostic
Module (SDM) causes current to flow through the deployment loops. Current passing through the initiator ignites the material in the inflator module.
The gas produced from this reaction rapidly inflates the air bag.
There is a shorting bar on the Inflatable Restraint Steering Wheel Module side of the upper steering column connector that connects the Inflatable
Restraint Steering Wheel Module Coil to the Inflatable Restraint Steering Wheel Module. The shorting bar shorts across the Inflatable Restraint Steering
Wheel Module circuits during the disconnection of the upper steering column connector. The shorting of the Inflatable Restraint Steering Wheel Module
circuitry will help prevent unwanted deployment of the air bag when servicing the Inflatable Restraint Steering Wheel Module, the steering column or
other SIR system components. There is a shorting bar on the Inflatable Restraint Instrument Panel (IP) module connector that connects to the SIR wiring
harness. The shorting bar shorts across the Inflatable Restraint IP module circuits during the disconnection of the Inflatable Restraint IP module
connector. The shorting of the Inflatable Restraint IP module circuitry will help prevent unwanted deployment of the air bag when servicing the
Inflatable Restraint IP module, the instrument panel or other SIR system components.
In the event of a fault in the Inflatable Restraint IP module switch circuitry, the SDM will detect the fault and set diagnostic trouble code (DTC) B1054,
the SDM will attempt to illuminate the AIR-BAG OFF lamp, the AIR BAG warning lamp will turn ON and the Inflatable Restraint IP module will
default to the suppressed (disabled) state.
