|
|
02-9 8810-00 1. AIR BAG SYSTEM OVERVIEW The air bag system is divided into front air bag system and side air bag system. The system protects the occupant's body by deploying the air bags in the event of a collision. The system consists of 8 inflators including the inflators of the seat belt pretensioners, air bag unit (SDM), and 4 impact sensors on the front side and both sides of the vehicle. The air bag unit (SDM) determines the operation of each air bag module and seat belt pretensioners using the crash signals from the front and side impact sensors in the event of a collision. The front and side air bag systems are operated independently, and the body control module (BCM) activates the auto door unlock function and various lamps including hazard warning lamp and room lamps, when the crash signal from the SDM is received to notify others of emergency situation and let the occupant escape easily. The SDM is equipped with self diagnosis function, and it performs the diagnosis on the internal/external devices of the air bag system for a certain period of time after IGN ON. And it monitors the air bag system regularly and turns on the air bag warning lamp on the instrument cluster when a fault is found in the system, to notify the driver. The SDM has event data recorder (EDR) function that stores the driving information data transmitted through CAN communication from various units (vehicle speeds, engine rpm, brake application, etc.) in a crash or near crash event, when the acceleration sensor in the air bag unit detects a sharp acceleration change, regardless of the air bag deployment |