System Description

System Diagram:

SYSTEM DIAGRAM

SYSTEM DESCRIPTION

1. DESCRIPTION OF SUPPLEMENTAL RESTRAINT SYSTEM

a. General description.
1. In this system, the air bag sensor assy center installed on the floor under the A/C unit determines whether or not to activate the SRS air bags (driver air bag, passenger air bag, front seat air bags and curtain shield air bags) and seat belt pretensioners by receiving the collision signal from each sensor (excluding the air bag sensor assy center). When there is trouble in the system, the air bag sensor assy center turns on the SRS warning light on the combination meter assy to inform the driver.

b. Description of the dual stage control.
1. The air bag sensor assy center controls the dual stage deployment of the driver air bag in the horn button assy and the passenger air bag on the instrument panel. The air bag sensor assy center controls the dual stage deployment of the driver air bag according to the collision impact, seat position and seat belt ON/OFF state. It also controls the dual stage deployment of the passenger air bag according to the collision impact and seat belt ON/OFF state.

2. IGNITION JUDGEMENT AND CONDITIONS




a. Operation in case of front collision.
1. When the vehicle collides in the hatched area (Fig.1) and shock is larger than a predetermined level, the air bags (driver and front passenger) are activated automatically. The deceleration sensor of the air bag sensor assy center determines the need for ignition in response to collisions within the hatched area based on the signal from the deceleration sensor of the front air bag sensor.
2. Safing sensor of the air bag sensor assy center is designed to activate at a smaller deceleration rate than the deceleration sensor. As illustrated in Fig. 2, when both the safing sensor and deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.




b. w/ Side air bag:
Operation in case of front side collision.
1. Electronic safing sensor of the side air bag sensor assy is designed to activate at a smaller deceleration rate than the deceleration sensor of the side air bag sensor assy. As illustrated, when both the safing sensor and deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.




c. w/ Side air bag:
Operation in case of rear side collision.
1. Electronic safing sensor of the air bag sensor assy center is designed to activate at a smaller deceleration rate than the deceleration sensor of the air bag sensor rear. As illustrated, when both the safing sensor and deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.

3. DESCRIPTION OF OCCUPANT CLASSIFICATION SYSTEM

a. GENERAL DESCRIPTION.
1. In the front passenger occupant classification system, the occupant classification ECU calculates the weight of the occupant based on a signal from the occupant classification sensor. This system recognizes the occupant to be a child if it detects a weight of less than 36 kg (79.37 lb), and disables the front and side air bags.
2. This system is mainly comprised of 4 occupant classification sensors that detect the load on the front passenger seat. The occupant classification ECU controls the system, and the passenger air bag ON/OFF indicator light indicates the ON/OFF condition of the front passenger air bag and front passenger seat air bag assy.




b. OCCUPANT CLASSIFICATION SENSOR.
1. The occupant classification sensors are installed on the 4 brackets connecting the seat rail and seat frame. Accordingly, when a load is applied to the passenger seat by an occupant sitting in it, the occupant classification sensors register a distortion.