Description - Acura NSX 1997 Service Manual

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Supplemental Restraint System (SRS)

Description

SRS Airbag System

The SRS is a safety device which, when used in conjunction with the seat belts, is designed to protect the driver and pas-

senger in a frontal impact exceeding a certain set limit.

The system is composed of left and right dash sensors, the SRS unit (includes safing sensor), the cable reel, driver's

airbag, and the passenger's airbag.

Seat Belt Tensioners

The seat belt tensioners are linked with the SRS airbags to further increase the effectiveness of the seat belts. In a front-

end collision, the tensioners instantly retract the belts firmly to secure the occupants in their seats.

LEFT DASH SENSOR

As shown in the diagram below, the left and right dash sensors are connected in parallel. The parallel set of sensors is

connected in series to each airbag inflator circuit and the vehicle battery. In addition, a back-up power circuit is connected

in parallel with the vehicle battery. The back-up power circuit and the safing sensor are located inside the SRS unit.

For the SRS to operate:

(1) One or both safing sensor and one or both dash sensors must activate.

(2) Electrical energy must be supplied to the airbag inflator by the battery, or the back-up power circuit if the battery

voltage is too low.

(3) Airbag and seat belt tensioner charges must be released. Then the airbags will deploy and the tensioners will

Self-diagnosis system

A self-diagnosis circuit is built into the SRS unit; when the ignition switch is turned ON (II), the SRS indicator light comes on

and goes off after about six seconds if the system is operating normally. If the light does not come on, or does not go off

after six seconds, or if it comes on while driving, it indicates an abnormality in the system. The system must be inspected

and repaired as soon as possible.

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RIGHT DASH SENSOR

PASSENGER'S SEAT BELT

DRIVER'S SEAT BELT

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