Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Supplemental Restraint System MSA5TCD00L18272

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LEGACY (W2260BE_SGML Complete)

MECHANISM AND FUNCTION [M2A0] 5-5
2. Construction

2. Construction
A: GENERAL
D The SRS airbag consists of an airbag control module, left and right front sub sensors, electric
sensor and safety sensor built into the control module, airbag modules of driver and passenger
containing an inflator and airbag, and side airbag sensor and side airbag module containing an
inflator and airbag (Side airbag equipped model).
D FRONT AIRBAG SYSTEM:
A frontal impact causes the safety sensor, electric sensor and front sub sensor to input an impact
signal to the CPU. The CPU judges whether the airbags should be inflated or not based on these
input signal values.
D SIDE AIRBAG SYSTEM:
Input of a side impact signal that exceeds a preset value causes the airbag on the side that re-
ceived the impact to inflate.

B5H0552

5
LEGACY (W2260BE_SGML Complete)

5-5 [M2B0] MECHANISM AND FUNCTION
2. Construction

B: AIRBAG CONTROL MODULE
The airbag control module is installed ahead of the front floor tunnel. It detects the vehicle's decel-
eration by receiving electrical signals from the sensors and judges whether to fire the airbag. This
control module has a built-in self-diagnosis function. If a trouble occurs inside the system, it lights
up the airbag warning light in the combination meter. The trouble data is stored in the module. A
back-up power supply is provided for possible damage to the battery during an accident, and a
boosting circuit is built into the module in case of a battery voltage drop.

S5H0010

C: FRONT SUB SENSOR
One front sub sensor is installed on both left and right sides ahead of the front wheel apron wall.
Front sub sensor is the pendulum type sensor. If the sensor receives a frontal impact exceeding
a certain limit, the mass in the sensor revolves forward to turn the switch ON.

B5H0507A

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LEGACY (W2260BE_SGML Complete)

MECHANISM AND FUNCTION [M2D0] 5-5
2. Construction

D: AIRBAG SENSOR
Safety sensor and electric sensor are built into the airbag control module and side airbag sensor.
Safety sensor is the pendulum type sensor. If the sensor receives a frontal or side impact exceed-
ing a certain limit, the mass in the sensor moves forward to turn the switch ON.
The electric sensor consists of the semiconductor type sensor which senses the deceleration at
collision by the change of the electrical resistance and the impact sensing circuit.

H5H0685A

7
LEGACY (W2260BE_SGML Complete)

5-5 [M2E1] MECHANISM AND FUNCTION
2. Construction

E: AIRBAG MODULE
1. FRONT AIRBAG
The driver's airbag module is located at the center of the steering wheel, and passenger's airbag
module is located at upper side of instrument panel, and it each contains an airbag and inflator.
If a collision occurs, the inflator produces a large volume of gas inflating the airbag in a very short
time.

B5H0823A

(1) Airbag (4) Inflator (Passenger)
(2) Inflator (Driver) (5) Steering support beam
(3) Airbag module lid

2. SIDE AIRBAG
The side airbag module is located at the outside of the front backrest, and it contains an airbag
and an inflator.
If a side collision occurs, the inflator produces a large volume of gas inflating the airbag in a very
short time.

B5H0508A

8
LEGACY (W2260BE_SGML Complete)

MECHANISM AND FUNCTION [M2F2] 5-5
2. Construction

F: AIRBAG CONNECTOR
1. DISCRIPTION
The SRS airbag adopts a connector which has a double lock mechanism and coupling error
detection mechanism for enhanced reliability. If coupling is incomplete, the airbag warning light
comes on in the combination meter.

2. DISCONNECTION (AIRBAG HARNESS TO AIRBAG HARNESS)

S5H0012A

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LEGACY (W2260BE_SGML Complete)

5-5 [M2F3] MECHANISM AND FUNCTION
2. Construction

3. DISCONNECTION (AIRBAG HARNESS TO BODY HARNESS)
To disconnect the connector, press lever (A) to pop green lever (B) out, this unlocks the double
lock system. Then separate the connector by pulling both sides while holding the connector sec-
tions and pressing in lever (A).
To couple the connector, insert both connectors until a "click" is heard, then push in the green lever
(B) until a "click" is heard; this applies the double lock.

B5H0841A

10
LEGACY (W2260BE_SGML Complete)

MECHANISM AND FUNCTION [M2F4] 5-5
2. Construction

4. DISCONNECTION (FRONT SUB SENSOR AND SIDE AIRBAG SENSOR)

B5H0509A

11
LEGACY (W2260BE_SGML Complete)

5-5 [M2G0] MECHANISM AND FUNCTION
2. Construction

G: STEERING ROLL CONNECTOR
The steering roll connector is located between the steering column and steering wheel. A flat cable
stored in a spiral form transmits the electrical signal from the airbag control module to the steering
wheel from the body harness.

S5H0013A

H: AIRBAG WARNING LIGHT
The airbag warning light is located inside the combination meter. It illuminates if a poor connection
occurs, or if the airbag control module detects an abnormality, When the airbag system is normal,
this light goes out about 7 seconds after turning the ignition switch ON.

B5H0633

I: WIRE HARNESS
The wire harness of the SRS airbag is entirely covered with a yellow protective tube, and can easily
be identified from harnesses of other systems.

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LEGACY (W2260BE_SGML Complete)

MECHANISM AND FUNCTION [M2J0] 5-5
2. Construction

J: LOCATIONS OF WARNING AND CAUTION LABELS

B5H0842A

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LEGACY (W2260BE_SGML Complete)

5-5 MECHANISM AND FUNCTION

MEMO

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