Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 48. AIRBAG SYSTEM 02. Construction
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W1860BE.book Page 7 Tuesday, January 28, 2003 11:01 PM
CONSTRUCTION
AIRBAG SYSTEM
2. Construction
A: GENERAL
The airbag system consists of an airbag control module, left and right front sub sensors, an elec-
tric sensor and safety sensor built into the control module, driver's and passenger's airbag modules
each containing an inflator and airbag, and side airbag sensors and modules each containing an
inflator and airbag (side airbag equipped models).
Front airbag system:
A frontal impact exceeding the set level causes the safety sensor, electric sensor and one or both
front sub sensors to input impact signals to the CPU. The CPU determines whether the airbags
should be inflated or not based on these signals.
Side airbag system:
Input of a side impact signal showing shock energy greater than the set level causes the airbag on
the corresponding side to inflate.
(2)
(3)
(1)
(4)
(5)
(6)
(7)
(8)
(10) (12)
(9)
(11)
AB-00092
(1) Front sub sensor LH (5) Airbag control module (9) Side airbag sensor LH
(2) Safety sensor (6) Electric sensor (10) Side inflator LH
(3) Front sub sensor RH (7) Inflator (driver's seat) (11) Side inflator RH
(4) CPU (8) Inflator (passenger's seat) (12) Side airbag sensor RH
AB-7
W1860BE.book Page 8 Tuesday, January 28, 2003 11:01 PM
CONSTRUCTION
AIRBAG SYSTEM
B: AIRBAG CONTROL MODULE
The airbag control module is installed in front of the front floor tunnel. It detects the vehicle's decel-
eration by receiving electrical signals from its inside safety and electric sensors as well as the front
sub sensors and judges whether to inflate the airbags. This control module has a built-in self-diag-
nosis function. If a fault occurs inside the system, it lights up the airbag warning light in the combi-
nation meter. The fault data is stored in the control 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 control
module in case of a battery voltage drop.
AB-00093
AB-8
W1860BE.book Page 9 Tuesday, January 28, 2003 11:01 PM
CONSTRUCTION
AIRBAG SYSTEM
C: AIRBAG SENSOR
The airbag control module and side airbag sensor contain an electric sensor and a safety sensor.
The electric sensor consists of a semiconductor type sensor which senses the deceleration caused
by collision in terms of change in the electrical resistance of the impact sensing circuit.
The safety sensor is a pendulum type sensor. If the sensor receives a frontal or side impact exceed-
ing a certain limit, the mass in the sensor moves in the direction opposite to the impact direction to
turn the switch ON.
AB-9
W1860BE.book Page 10 Tuesday, January 28, 2003 11:01 PM
CONSTRUCTION
AIRBAG SYSTEM
(A)
(1)
(2)
(3)
(B)
(2)
(4)
AB-00094
(A) Electric sensor (1) Electrical resistance
(B) Safety sensor (2) Mass
(3) Semiconductor
(4) Switch contacts
AB-10
W1860BE.book Page 11 Tuesday, January 28, 2003 11:01 PM
CONSTRUCTION
AIRBAG SYSTEM
D: AIRBAG MODULE
1. FRONT AIRBAG
The driver's airbag module is located at the center of the steering wheel and the passenger's airbag
module is located at upper portion of instrument panel. Each module contains an airbag and an in-
flator. If a collision occurs, the inflator produces a large volume of gas to inflate the airbag in a very
short time.
(A) (B) (3)
(1)
(4)
(2)
(5)
AB-00407
(A) Driver's module (B) Passenger's module
(1) Air bag (4) Inflator (passenger)
(2) Inflator (Driver's seat) (5) Steering support beam
(3) Airbag module lid
AB-11
W1860BE.book Page 12 Tuesday, January 28, 2003 11:01 PM
CONSTRUCTION
AIRBAG SYSTEM
2. SIDE AIRBAG
A side airbag module is located at the outer side of each front seat backrest, and it contains an air-
bag and an inflator.
If a side-on collision occurs, the inflator produces a large volume of gas to inflate the airbag in a very
short time.
(2)
(3)
A
A (1)
(4)
(6)
(5)
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