Cobalt L4-2.0L SC VIN P (2005)
Side Air Bag: Description and Operation
Inflatable Restraint Roof Rail Modules
INFLATABLE RESTRAINT ROOF RAIL MODULES
The roof rail modules are located under the headliner extending from the front windshield pillar to the rear window pillar. The roof rail modules contain
a housing, inflatable air bag, initiating device, and a canister of gas generating material. The initiator is part of the roof rail module deployment loop.
When a side impact of sufficient force occurs the side impact sensor (SIS) detects the impact and sends a signal to the sensing and diagnostic module
(SDM). The SDM compares the signal received from the SIS to a value stored in memory. When the generated signal exceeds the stored value, the SDM
will cause current to flow through the side deployment loop deploying the roof rail air bags. The SDM, roof rail modules and the connecting wires
makeup the side deployment loops. The SDM continuously monitors the deployment loops for malfunctions and turns the AIR BAG indicator ON if a
fault is present.
Each roof rail module is equipped with a shorting bar located on the connector of the module. The shorting bar shorts the roof rail modules deployment
loop circuitry to prevent unwanted deployment of the air bag when servicing the inflator module.
