System Description

System Diagram:

SYSTEM DESCRIPTION

1. DESCRIPTION OF SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
a. General description
1. In this system, the center airbag sensor 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 the airbag sensors (excluding the center airbag sensor). When there is trouble in the system, the center airbag sensor turns on the SRS warning light on the combination meter to inform the driver.

b. Description of the dual stage control
1. The center airbag sensor controls the dual stage deployment of the driver airbag in the horn button and the passenger airbag on the instrument panel. The center airbag sensor 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 center airbag sensor can be operated using the check mode of the intelligent tester function. Check mode can detect and output DTC by using the intelligent tester to switch the center airbag sensor to the check mode.

A simulation method should be 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 center airbag sensor in check mode makes it possible to obtain a more accurate malfunction condition.

2. IGNITION JUDGMENT 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 center airbag sensor 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 center airbag sensor is designed to activate at a lower deceleration rate than the deceleration sensor. As illustrated in Fig. 2 given, when both the safing sensor and deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.

b. With side curtain shield airbag:
Operation in case of front side collision




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

c. With side and curtain shield airbag:
Operation in case of rear side collision




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