sensor SUBARU LEGACY 2008 4.G Owners Manual

Function settings
A SUBARU dealer can change the settings of the functions shown in the following table to meet your personal requirements. Contact
the nearest SUBARU dealer for details. If your vehicle is equipped with navigation system, the settings for some of these functions can
be changed using the monitor. For details, please refer to the Owner’s Manual supplement for the monitor.
Item Function Possible settings Default setting Page
Alarm system Alarm system Operation / Non-operation Operation 2-15 Monitoring start delay time (after closure
of doors) 0 second / 30 seconds 30 seconds 2-17
Impact sensor operation (only vehicles
with shock sensors (dealer option)) Operation / Non-operation Non-operation 2-19
Passive arming Operation / Non-operation Non-operation 2-18
Remote keyless entry sys- tem Hazard warning flasher Operation / Non-operation Operation 2-8
Audible signal Operation / Non-operation Operation 2-10
Key lock-in prevention Key lock-in prevention Operation / Non-operation Operation 2-7
Remote engine start system
(dealer option) Horn chirp confirmation ON/OFF ON 7-11
Rear window defogger Rear window defogger Operation for 15 minutes / Continuous operationOperation for 15 minutes 3-54
Windshield wiper deicer (if
equipped) Windshield wiper deicer Operation for 15 minutes /
Continuous operationOperation for 15 minutes 3-53
Map light/Dome light Operation in conjunction with remote keyless entry system OFF / Short / Normal / Long Normal 6-2
Map light Operation in conjunction with remote keyless entry system and opening door ON / OFF ON 6-2
Battery drainage prevention function Battery drainage prevention function Operation / Non-operation Operation 2-6 23

1-24Seat, seatbelt and SRS airbags
Front seatbelt pretensioners
The driver ’s and front passenger ’s seat-
belts have a seatbelt pretensioner. The
seatbelt pretensioners are designed to be
activated in the event of an accident
involving a moderate to severe frontalcollision.
The pretensioner sensor also serves as a
SRS frontal airbag sensor. If the sensor
detects a certain predetermined amount of
force during a frontal collision, the front
seatbelt is quickly drawn back in by the
retractor to take up the slack so that the
belt more effectively restrains the front
seat occupant.
When a seatbelt pretensioner is activated,
an operating noise will be heard and a small amount of smoke will be released.
These occurrences are normal and not
harmful. This smoke does not indicate a
fire in the vehicle.
Once the seatbelt pretensioner has been
activated, the seatbelt retractor remains
locked. Consequently, the seatbelt can not
be pulled out and retracted and therefore
must be replaced.
NOTE . Seatbelt pretensioners are not de-
signed to activate in minor frontal
impacts, in side or rear impacts or in
roll-over accidents.. The driver ’s seat and passenger ’s
seat pretensioners and frontal airbag
operate simultaneously.. Pretensioners are designed to func-
tion on a one-time-only basis. In the
event that a pretensioner is activated,
both the driver ’s and front passenger ’s
seatbelt retractor assemblies must be
replaced and only by an authorized
SUBARU dealer. When replacing seat-
belt retractor assemblies, use only
genuine SUBARU parts.. If either front seatbelt does not
retract or cannot be pulled out due to
a malfunction or activation of the
pretensioner, contact your SUBARU
dealer as soon as possible. .
If the front seatbelt retractor assem-
bly or surrounding area has been
damaged, contact your SUBARU dealer
as soon as possible.. When you sell your vehicle, we urge
you to explain to the buyer that it has
seatbelt pretensioners by alerting him
to the contents of this section.
WARNING
. To obtain maximum protection,
occupants should sit in an up-
right position with their seatbelts
properly fastened. Refer to the“ Seatbelts ”section in this chap-
ter.
. Do not modify, remove or strike
the front seatbelt retractor as-
semblies or surrounding area.
This could result in accidental
activation of the seatbelt preten-
sioners or could make the sys-
tem inoperative, possibly result-
ing in serious injury. Seatbelt
pretensioners have no user-ser-
viceable parts. For required ser-
vicing of front seatbelt retractors
equipped with seatbelt preten-
sioners, see your nearest
SUBARU dealer.
. When discarding front seatbelt

retractor assemblies or scrap-
ping the entire vehicle due to
collision damage or for other
reasons, consult your SUBARU
dealer.
& System monitors
SRS airbag system warning light (Vehicle
with SI-DRIVE)
SRS airbag system warning light (Vehicle
without SI-DRIVE)
A diagnostic system continually monitors
the readiness of the seatbelt pretensioner
while the vehicle is being driven. The
seatbelt pretensioners share the control
module with the airbag system. Therefore,
if any malfunction occurs in a seatbelt
pretensioner, the SRS airbag system
warning light will illuminate. The SRS
airbag system warning light will show
normal system operation by lighting for
approximately 6 seconds when the igni-
tion switch is turned to the “ON ”position.
The following components are monitored
by the indicator: . Front sub sensor (Right-hand side)
. Front sub sensor (Left-hand side) .
Airbag control module (including im-
pact sensors). Frontal airbag module (Driver ’s side)
. Frontal airbag module (Front passen-
ger ’s side)
. Side airbag sensor (Center pillar right-
hand side). Side airbag sensor (Center pillar left-
hand side). Side airbag module (Driver ’s side)
. Side airbag module (Front passenger ’s
side). Curtain airbag sensor (Rear wheel
house right-hand side). Curtain airbag sensor (Rear wheel
house left-hand side) . Curtain airbag module (Right side)
. Curtain airbag module (Left side)
. Satellite safing sensor (Under the rear
center seat) . Seatbelt pretensioner (Driver ’s side)
. Seatbelt pretensioner (Front passen-
ger ’s side)
. Seatbelt buckle switch (Front passen-
ger ’s side)
. Front passenger ’s seatbelt tension
sensor. Front passenger ’s occupant detection
system weight sensor. Front passenger ’s occupant detection
Seat, seatbelt and SRS airbags
1-25
– CONTINUED –

1-26Seat, seatbelt and SRS airbags
control module .Front passenger ’s frontal airbag ON
and OFF indicator. All related wiring
WARNING
If the warning light exhibits any of
the following conditions, there may
be a malfunction in the seatbelt
pretensioners and/or SRS airbag
system. Immediately take your vehi-
cle to your nearest SUBARU dealer
to have the system checked. Unless
checked and properly repaired, the
seatbelt pretensioners and/or SRS
airbags will operate improperly (e.g.
SRS airbags may inflate in a very
minor collision or not inflate in a
severe collision), which may in-
crease the risk of injury. . Flashing or flickering of the warn-
ing light
. No illumination of the warning
light when the ignition switch is
first turned to the “ON ”position
. Continuous illumination of the
warning light
. Illumination of the warning light
while driving &
System servicing
WARNING
. When discarding a seatbelt re-
tractor assembly or scrapping
the entire vehicle damaged by a
collision, consult your SUBARU
dealer.
. Tampering with or disconnecting
the system ’s wiring could result
in accidental activation of the
seatbelt pretensioner and/or air-
bag or could make the system
inoperative, which may result in
serious injury. The wiring har-
nesses of the seatbelt preten-
sioner and SRS airbag systems
are covered with yellow insula-
tion and the connectors of the
system are yellow for easy iden-
tification. Do not use electrical
test equipment on any circuit
related to the seatbelt preten-
sioner and airbag systems. For
required servicing of the seatbelt
pretensioner, see your nearest
SUBARU dealer.
CAUTION
The front sub sensors are located in
both front fenders and the airbag
control module including the impact
sensors is located under the center
console. If you need service or
repair in those areas or near the
front seatbelt retractors, have an
authorized SUBARU dealer perform
the work.
NOTE
If the front part of the vehicle is
damaged in an accident to the extent
that the seatbelt pretensioner does not
operate, contact your SUBARU dealer
as soon as possible.

!Components
Sedan
1) Airbag control module (including impact sensors)
2) Frontal airbag module (driver ’s side)
3) Frontal airbag module (front passenger ’s
side) 4) Front sub sensor (left-hand side)
5) Front sub sensor (right-hand side)
6) Side airbag module (driver
’s side)
7) Side airbag module (front passenger ’s
side) 8) Side airbag sensor (center pillar left-hand
side)
9) Side airbag sensor (center pillar right- hand side)
10) Airbag wiring (yellow)
11) Seatbelt pretensioner (driver ’s side)
12) Seatbelt pretensioner (front passenger ’s
side)
13) Curtain airbag sensor (rear wheel house right-hand side)
14) Curtain airbag sensor (rear wheel house left-hand side)
15) Curtain airbag module (right side)
16) Curtain airbag module (left side)
17) Seatbelt buckle switch (front passenger ’s
side)
18) Front passenger ’s seatbelt tension sen-
sor
19) Front passenger ’s occupant detection
system weight sensor
20) Front passenger ’s occupant detection
control module
21) Front passenger ’s frontal airbag ON and
OFF indicator
22) SRS airbag system warning light
23) Satellite safing sensor (under the rear center seat)
Seat, seatbelt and SRS airbags
1-43
– CONTINUED –

1-44Seat, seatbelt and SRS airbags
Station wagon
1) Airbag control module (including impact sensors)
2) Frontal airbag module (driver ’s side)
3) Frontal airbag module (front passenger ’s
side)
4) Front sub sensor (left-hand side)
5) Front sub sensor (right-hand side) 6) Side airbag module (driver
’s side)
7) Side airbag module (front passenger ’s
side)
8) Side airbag sensor (center pillar left-hand side)
9) Side airbag sensor (center pillar right- hand side) 10) Airbag wiring (yellow)
11) Seatbelt pretensioner (driver
’s side)
12) Seatbelt pretensioner (front passenger ’s
side)
13) Curtain airbag sensor (rear wheel house right-hand side)
14) Curtain airbag sensor (rear wheel house left-hand side)
15) Curtain airbag module (right side)
16) Curtain airbag module (left side)
17) Seatbelt buckle switch (front passenger ’s
side)
18) Front passenger ’s seatbelt tension sen-
sor
19) Front passenger ’s occupant detection
system weight sensor
20) Front passenger ’s occupant detection
control module
21) Front passenger ’s frontal airbag ON and
OFF indicator
22) SRS airbag system warning light
23) Satellite safing sensor (under the rear center seat)

WARNING
Do not attach accessories to the
windshield, or fit an extra-wide mir-
ror over the rear view mirror. If the
SRS airbag deploys, those objects
could become projectiles that could
seriously injure vehicle occupants.
! Driver ’s SRS frontal airbag
The driver ’s SRS frontal airbag uses a
dual stage inflator. The inflator operates in
different ways depending on the severity
of impact.
Have the system inspected by your
SUBARU dealer immediately if the SRS
airbag system warning light comes on. NOTE
The driver
’s SRS side airbag, SRS
curtain airbag and seatbelt preten-
sioner are not controlled by the Subaru
advanced frontal airbag system. ! Front passenger ’s SRS frontal air-
bag
The front passenger ’s SRS frontal airbag
uses a dual stage inflator. The inflator
operates in different ways depending on
the severity of impact.
The total load on the seat is monitored by
the passenger ’s occupant detection sys-
tem weight sensor under the seat.
The system has another sensor that
monitors the tension of the front passen-
ger seatbelt. Using the total seat load and
seatbelt tension data from the sensors,
the occupant detection system determines
whether the front passenger ’s SRS frontal
airbag should or should not be inflated.
The occupant detection system may not
inflate the front passenger ’s SRS frontal
airbag even when the driver ’s SRS frontal
airbag deploys. This is normal.
Observe the following precautions. Failure
to do so may prevent the Subaru ad-
vanced frontal airbag system from func-
tioning correctly or cause the system to fail. . Do not apply any strong impact to the front passenger
’s seat such as by kicking.
. Do not spill liquid on the front passen-
ger ’s seat. If liquid is spilled, wipe it off
immediately.. Do not remove or disassemble the front
passenger ’s seat.
. Do not install any accessory (such as
an audio amplifier) other than a genuine
SUBARU accessory under the front pas-senger ’s seat.
. Do not place anything (shoes, umbrel-
la, etc.) under the front passenger ’s seat.
. The front passenger ’s seat must not be
used with the head restraint removed. . Do not leave any article including a
child restraint system on the front passen- ger ’s seat or the seatbelt tongue and
buckle engaged when you leave your vehicle. . Do not place a magnet near the
seatbelt buckle and the seatbelt retractor.. Do not use front seats with their back-
ward-forward position and seatback not
being locked into place securely. If any of
them are not locked securely, adjust them
again. For adjusting procedure, refer to“ Manual seat ”in the front seats section in
Chapter 1 in this Owner ’s Manual. (Mod-
els equipped with manual seats only)
If the seatbelt buckle switch and/or front passenger ’s occupant detection system
Seat, seatbelt and SRS airbags
1-47
– CONTINUED –

1-52Seat, seatbelt and SRS airbags
tem is designed to determine the activa-
tion or deactivation condition of the frontpassenger ’s SRS frontal airbag depend-
ing on the total load on the front passen-ger ’s seat monitored by the front passen-
ger ’s occupant detection system weight
sensor. For this reason, only the driver ’s
SRS frontal airbag may deploy in the
event of a collision, but this does not mean
failure of the system.
If the front sub sensors inside both front
fenders and the impact sensors in the
airbag control module detect a predeter-
mined amount of force during a frontal
collision, the control module sends signals
to the airbag module(s) (only driver ’s
module or both driver ’s and front passen-
ger ’s modules) instructing the module(s)
to inflate the SRS frontal airbag(s). Thedriver ’s and front passenger ’s SRS frontal
airbags use dual stage inflators. The two
inflators of each airbag are triggered either
sequentially or simultaneously, depending
on the severity of impact in the case of thedriver ’s SRS frontal airbag and depending
on the severity of impact and the total load
on the seat in the case of the front
passenger ’s SRS frontal airbag. After
deployment, the SRS airbag immediately
starts to deflate so that the driver ’s vision
is not obstructed. The time required from
detecting impact to the deflation of the SRS airbag after deployment is shorter
than the blink of an eye.
Both when only the driver
’s SRS frontal
airbag deploys and the driver ’s and front
passenger ’s SRS frontal airbags deploy,
the driver ’s and front passenger ’s seatbelt
pretensioners operate at the same time.
Although it is highly unlikely that the SRS
airbag would activate in a non-accident
situation, should it occur, the SRS airbag
will deflate quickly, not obscuring vision
and will not interfere with the driver ’s
ability to maintain control of the vehicle.
When the SRS airbag deploys, a sudden,
fairly loud inflation noise will be heard and
some smoke will be released. These
occurrences are a normal result of the
deployment. This smoke does not indicate
a fire in the vehicle.
CAUTION
Do not touch the SRS airbag system
components around the steering
wheel and dashboard with bare
hands right after deployment. Doing
so can cause burns because the
components can be very hot as a
result of deployment. The driver
’s SRS frontal airbag and front
passenger ’s SRS frontal airbag are de-
signed to deploy in the event of an
accident involving a moderate to severe
frontal collision. It is basically not designed
to deploy in lesser frontal impacts be-
cause the necessary protection can be
achieved by the seatbelt alone. Also, they
are basically not designed to deploy in
side or rear impacts or in roll-over acci-
dents because deployment of only thedriver ’s SRS frontal airbag or both driver ’s
and front passenger ’s SRS frontal airbags
would not help the occupant in those
situations. The driver ’s and front passen-
ger ’s SRS frontal airbags are designed to
function on a one-time-only basis.
SRS airbag deployment depends on the
level of force experienced in the passen-
ger compartment during a collision. That
level differs from one type of collision to
another, and it may have no bearing on
the visible damage done to the vehicleitself.

1-58Seat, seatbelt and SRS airbags
WARNING
Do not put any kind of cover or
clothes or other objects over either
front seatback and do not attach
labels or stickers to the front seat
surface on or near the SRS side
airbag. They could prevent proper
deployment of the SRS side airbag,
reducing protection available to the
front seat ’s occupant. !
OperationThe SRS side airbag and SRS curtain
airbag can function only when the ignition
switch is in the “ON ”position.
The driver ’s and front passenger ’s SRS
side airbags and SRS curtain airbags
deploy independently of each other since
each has its own impact sensor. There-
fore, they may not both deploy in the same
accident. Also, the SRS side airbag and
SRS curtain airbag deploys independently
of the driver ’s and front passenger ’s SRS
frontal airbags in the steering wheel and
instrument panel.
An impact sensor, which senses impact
force, is located in each of the left and
right center pillars and rear wheel houses.
Another impact sensor, which also senses impact force, is located under the rear
center seat. If one of the center pillar
impact sensors and the impact sensor that
is located under the rear center seat
together sense an impact force above a
predetermined level in a side collision, the
control module causes both the SRS side
airbag and curtain airbag on the impacted
side to inflate regardless of whether the
rear wheel house impact sensor on the
same side senses an impact. If one of the
rear wheel house impact sensors and the
impact sensor that is located under the
rear center seat together sense a suffi-
ciently strong impact force, the control
module causes only the SRS curtain
airbag on the impacted side to inflate.
After the deployment, the SRS side airbag
immediately starts to deflate. The time
required from detection of an impact to
deflation of an SRS side airbag after
deployment is shorter than the blink of
an eye.
The SRS curtain airbag remains inflated
for a while following deployment then
slowly deflates.
The SRS side airbag and SRS curtain
airbag deploy even when no one occupies
the seat on the side on which an impact isapplied.
When the SRS side airbag and SRS

1-62Seat, seatbelt and SRS airbags
Vehicle without SI-DRIVE
A diagnostic system continually monitors
the readiness of the SRS airbag system
(including front seatbelt pretensioners)
while the vehicle is being driven. The
SRS airbag system warning light “AIR-
BAG ”will show normal system operation
by lighting for approximately 6 seconds
when the ignition switch is turned to the“ ON ”position.
The following components are monitored
by the indicator: . Front sub sensor (Right-hand side)
. Front sub sensor (Left-hand side)
. Airbag control module (including im-
pact sensors). Frontal airbag module (Driver ’s side)
. Frontal airbag module (Front passen- ger
’s side)
. Side airbag sensor (Center pillar right-
hand side). Side airbag sensor (Center pillar left-
hand side). Side airbag module (Driver ’s side)
. Side airbag module (Front passenger ’s
side). Curtain airbag sensor (Rear wheel
house right-hand side). Curtain airbag sensor (Rear wheel
house left-hand side). Curtain airbag module (Right side)
. Curtain airbag module (Left side)
. Satellite safing sensor (under the rear
center seat) . Seatbelt pretensioner (Driver ’s side)
. Seatbelt pretensioner (Front passen-
ger ’s side)
. Seatbelt buckle switch (Front passen-
ger ’s side)
. Front passenger ’s seatbelt tension
sensor . Front passenger ’s occupant detection
system weight sensor. Front passenger ’s occupant detection
control module. Front passenger ’s frontal airbag ON
and OFF indicator. All related wiring
WARNING
If the warning light exhibits any of
the following conditions, there may
be a malfunction in the seatbelt
pretensioners and/or SRS airbag
system. Immediately take your vehi-
cle to your nearest SUBARU dealer
to have the system checked. Unless
checked and properly repaired, the
seatbelt pretensioners and/or SRS
airbags will operate improperly (e.g.
SRS airbags may inflate in a very
minor collision or not inflate in a
severe collision), which may in-
crease the risk of injury. . Flashing or flickering of the warn-
ing light
. No illumination of the warning
light when the ignition switch is
first turned to the “ON ”position
. Continuous illumination of the
warning light
. Illumination of the warning light
while driving