System Description

System Diagram:

SYSTEM DESCRIPTION

1. DESCRIPTION OF SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
a. General description.
1. In this system, the airbag sensor assembly center installed on the floor under the A/C unit determines whether or not to activate the SRS airbags and seat belt pretensioners by receiving the collision signal from airbag sensors (excluding the airbag sensor assembly center). When there is trouble in the system, the airbag sensor assembly center turns on the SRS warning light on the combination meter assembly to inform the driver.

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

c. Description of check mode (signal check).
1. This airbag sensor assembly center is operable using the check mode of the hand-held tester function. Check mode can detect and output DTC by using a hand-held tester to switch the airbag sensor assembly center to the check mode. A simulation method is used, if the malfunction cannot be reproduced during troubleshooting (the malfunction is temporarily solved, etc.). In this case, joggling each connector, or driving on a city or rough road with the airbag sensor assembly center in check mode makes it possible to obtain a more accurate malfunction condition.

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 airbags (driver and front passenger) are activated automatically. The deceleration sensor of the airbag sensor assembly 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 airbag sensor.




2. Safing sensor of the airbag sensor assembly 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 and curtain shield airbag:
Operation in case of front side collision.




1. Electronic safing sensor of the side airbag sensor assembly is designed to activate at a smaller deceleration rate than the deceleration sensor of the side airbag sensor assembly. As illustrated, when both the safing sensor and deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.

c. w/ Side and curtain shield airbag:
Operation in case of rear side collision.




1. Electronic safing sensor of the airbag sensor assembly center is designed to activate at a smaller deceleration rate than the deceleration sensor of the airbag sensor rear. As illustrated, when both the safing sensor and deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.