英文资料Air Bags.docVIP

Air Bags A typical supplement inflatable restraint (SIR) or air bag system includes two important elements.The electrical system includes the impact sensors and the electronic control module. Its main functions are to conduct a system self-check to let the driver know that it is function properly, detect an impact,and to send a signal that inflates the air bag.The air bag module is located in the steering wheel.It contains the air bag and the ports that cause it to inflate.The knee diverter cushions the drvier from impact and helps prevent the driver from sliding under the air bag during a collision. It is located underneath the steering column and behind the steering column trim. Electronical System Components Diagnostic monitor assembly.The diagnostic monitor contains a microcomputer that monitors the electrical system components and connections.The monitor performs a self-check of the microcomputer internal circuits and energizes the system readiness indicator during prove out and whenever a fault occurs. System electrical faults can be detected and translated into coded indicator displays.If a certain fault occurs. The microcomputer disables the system by opening a thermal fuse built into the monitor. If a system fault exists and the indicator is malfunctioning, an audible tone signals the need for service. If certain faults occur, the system is disarmed by a firing circuit disarm device incorporated within the monitor or diagnostic module. An air bag system backup power supply is included in the diagnostic monitor to provide air bag deployment power if the battery or battery cables are damaged in an accident before the crash sensors close. The power supply depletes its stored energy approximately one minute after the positive cable of the battery is disconnected. WARNING: The backup power supply energy must be depleted before any air bag component service is performed. To deplete the backup power supply energy, disconnect the positive battery cable and wait one