Component Parts Location

Fig 1: SRS Airbag Control System Components Location

Courtesy of NISSAN MOTOR CO., U.S.A.

SRS AIRBAG CONTROL SYSTEM COMPONENTS FUNCTION CHART

No.	Component	Function
1.	Combination meter (air bag warning lamp)	Indicates air bag malfunctioning and deployment by blinking and illuminating air bag warning lamp.
2.	Combination switch (spiral cable)	Supplies power supply to driver air bag module on steering wheel.
3.	Driver air bag module	Receives signal from air bag diagnosis sensor unit and deploys air bag. In case of frontal collision where acceleration is more than the specified level, the ignition materials are ignited by electric ignition system. The system burns the gas generating materials resulting in a chemical reaction. This generates hot gases that flow into the air bag through a filter and expand the bag.
4.	Front passenger air bag OFF indicator	Turns the front passenger air bag OFF indicator lamp ON when the front passenger seat is occupied by a child or a child-seat
5.	Passenger air bag module	Receives signal from air bag diagnosis sensor unit and deploys air bag. In case of frontal collision where acceleration is more than the specified level, the ignition materials are ignited by electric ignition system. The system burns the gas generating materials resulting in a chemical reaction. This generates hot gases that flow into the air bag through a filter and expand the bag.
6.	VCM	Receive the collision detection signal when air bag diagnosis sensor unit detects collision. Refer to "COMPONENT PARTS LOCATION " for detailed installation location.
7.	Front door satellite sensor LH	Transmits signal to air bag diagnosis sensor unit when a side collision occurs. When air bag diagnosis sensor unit defines both signal voltage of the "G" sensor, pressure sensor and the safing algorithm to be that of collision which is more than the specified level, the driving circuit switches on and feeds the electric ignitor of both the side air bag, curtain air bag and pretensioner.
8.	Seat belt pre-tensioner LH	Receives signal from air bag diagnosis sensor unit and deploys seat belt pre-tensioner. In the case of a frontal collision or side collision that exceeds specified impact level, the air bag diagnosis sensor unit detects the deceleration caused by collision. It restrains the passenger with seat belt easing the stress on passengers chest with load limiter.
9.	Satellite sensor LH	Transmits signal to air bag diagnosis sensor unit when a side collision occurs. When air bag diagnosis sensor unit defines both signal voltage of the "G" sensor and the saving algorithm to be that of collision which is more than the specified level, the driving circuit switches on and feeds the electric ignitor of both the side air bag and curtain air bag and seat belt pre-tensioner.
10.	Lap pre-tensioner LH	Receives signal from air bag diagnosis sensor unit and deploys lap pre-tensioner. In the case of a frontal collision or side collision that exceeds specified impact level, the air bag diagnosis sensor unit detects the deceleration caused by collision. It restrains the passenger with seat belt easing the stress on passengers chest with load limiter. Lap pre-tensioner upgrades passenger restrain function by reducing movement of lumber during a frontal collision.
11.	Curtain air bag module LH	Deploys according to collision judgment of G sensor and safing sensor. Receives collision signal from air bag diagnosis sensor unit, ignites, and burns ignition material by electric ignition system, when side collision exceeds setting limit of the vehicle. Gas is generated by chemical reaction of ignition material, passes filter, and deploys air bag. Air bag module mainly consists of air bag and inflator that deploys air bag.
12.	Air bag diagnosis sensor unit	Detects a collision and supplies power supply for deployment to air bag module and pre-tensioner seat belt. It contains the "G" sensors for both frontal and side collisions and spare battery function in case of 12V battery damage in collision. Performs the deploy judgement of passenger air bag based on the information from Occupant Classification System control unit. Front passenger air bag OFF indicator turns ON turns OFF when passenger state signal detected by Occupant Classification System control unit is received.
13.	Side air bag module RH	Receives signal from air bag diagnosis sensor unit and deploys air bag. In case of side collision where acceleration is more than the specified level, the ignition materials are ignited by electric ignition system. The system burns the gas generating materials resulting in a chemical reaction. This generates hot gases that flow into the air bag through a filter and expand the bag.
14.	Occupant classification system control unit	Transmits the passenger seat status (occupied or empty) to air bag diagnosis sensor unit. It is installed in the passenger seat cushion.
15.	Seat belt buckle switch (passenger side)	Controls deployment timing depending on the seat belt condition that is fastened or unfastened.
16.	Crash zone sensor	Transmits signal to air bag diagnosis sensor unit when a frontal collision occurs. Crash zone sensor is a G sensor that outputs voltage signal during deceleration at the time of a vehicle frontal collision that is more than the specified limit is detected.