2003 SUBARU IMPREZA wiring

Seat, seatbelt and SRS airbags
1-29
– CONTINUED –
System monitors
A diagnostic system continually monitors the readi-
ness of the seatbelt pretensioner while the vehicle is
being driven. The seatbelt pretensioners share the
control module with the SRS airbag system. There-
fore, if any malfunction occurs in a seatbelt preten-
sioner, the SRS airbag system warning light will illu-
minate. The SRS airbag system warning light will
show normal system operation by lighting for about
6 seconds when the ignition key is turned to the
“ON” position.
The following components are monitored by the indi- cator:
Front sub sensor (Right hand side)
Front sub sensor (Left hand side)
Airbag control module (including impact sensors)
Seatbelt pretensioner (driver ’s side)
Seatbelt pretensioner (Passenger ’s side)
All related wiring
In the event of a malfunction indicated by any of fol-
lowing, the vehicle should be taken promptly to your
nearest SUBARU dealer to have the system
checked. Unless checked and repaired, the seatbelt
pretensioners and SRS airbag will not function reli- ably: Flashing or flickering of the indicator light.
No illumination of the warning light when the igni-
tion 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 retractor assem-
bly or scrapping the entire car damaged by a
collision, consult your SUBARU dealer. Tampering with or disconnecting the sys-
tem’ s wiring could result in accidental activa-

Seat, seatbelt and SRS airbags
1-30
tion of the seatbelt pretensioner and/or SRS airbag or could make the system inoperative,
which may result in serious injury. The wiring
harnesses of the seatbelt pretensioner and
SRS airbag systems are covered with yellowinsulation and the connectors of the system are yellow for easy identification. Do not use
electrical test equipment on any circuit relatedto the seatbelt pretensioner and SRS airbag
systems. For required servicing of the seat-
belt pretensioner, see your nearest SUBARU
dealer.
CAUTION
The front sub sensors are located in both front fenders and the SRS airbag control mod-
ule including the impact sensors is located
under the center console. If you need service or repair in those areas or near the front seat-belt retractors, we recommend that you have
an authorized SUBARU dealer perform thework.
NOTE If the front part of the vehicle is damaged in an
accident to the extent that the seatbelt preten- sioner does not operate, contact your SUBARUdealer as soon as possible.
Precautions against vehicle modifica- tion
CAUTION
Do not perform any of the following modifica- tions. Such modifications can interfere with proper operation of the seatbelt pretension- ers.Attachment of any equipment (bush bar,
winches, snow plow, skid plate, etc.) otherthan SUBARU genuine accessory parts to thefront end. Modification of the suspension system or
front end structure. Installation of a tire of different size and
construction from the tires specified on thetire placard attached to the driver ’s door jamb.
Always consult your SUBARU dealer if you want to
install any accessory parts to your vehicle.

Seat, seatbelt and SRS airbags
1-45
– CONTINUED –
1) Airbag control module
(including impact sensors)
2) Airbag module (driver ’s side)
3) Airbag module (passenger ’s
side)
4) Front sub sensor (left hand side)
5) Front sub sensor (right hand
side)
6) Side airbag module
(driver’ s side — if equipped)
7) Side airbag module (passenger’ s side — if
equipped)
8) Side airbag sensor (driver ’s
side — if equipped)
9) Side airbag sensor (passenger’ s side — if
equipped)
10) Airbag wiring (yellow)
11) Seatbelt pretensioner (driver ’s
side)
12) Seatbelt pretensioner (passenger’ s side)

Seat, seatbelt and SRS airbags
1-64
Frontal airbag module (Passenger ’s side)
Side airbag sensor (Driver ’s side — if equipped)
Side airbag sensor (Passenger ’s side — if
equipped) Side airbag module (Driver ’s side — if equipped)
Side airbag module (Passenger ’s side — if
equipped) Seatbelt pretensioner (Driver ’s side)
Seatbelt pretensioner (Passenger ’s side)
All related wiring
In the event of a malfunction indicated by any of fol-
lowing, the vehicle should be taken promptly to your
nearest SUBARU dealer to have the system
checked. Unless checked and repaired, the SRS
airbags will not function reliably: Flashing or flickering of the indicator light.
No illumination of the warning light when the igni-
tion switch is first turned to the “ON” position.
Continuous illumination of the warning light.
Illumination of the warning light while driving.
SRS airbag system servicing
WARNING
When discarding an airbag module or scrap-
ping the entire car damaged by a collision,
consult your SUBARU dealer. The SRS airbag has no user-serviceable
parts. Do not use electrical test equipment on any circuit related to the SRS airbag system.For required servicing of the SRS airbag, see
your nearest SUBARU dealer. Tampering withor disconnecting the system ’s wiring could re-
sult in accidental inflation of the SRS airbag
or could make the system inoperative, which
may result in serious injury. The wiring har-
nesses of the SRS airbag system are coveredwith yellow insulation and system connectorsare yellow for easy identification.

Seat, seatbelt and SRS airbags
1-66
Precautions against vehicle modifica- tion
WARNING
To avoid accidental activation of the system
or rendering the system inoperative, which
may result in serious injury, no modifications should be made to any components or wiring of the SRS airbag system.This includes following modifications: Installation of custom steering wheels
Attachment of additional trim materials to
the dashboard Installation of custom seats (for vehicles
with SRS side airbags only) Replacement of seat fabric or leather (for
vehicles with SRS side airbags only) Installation of additional fabric or leather
on the front seat (for vehicles with SRS side airbags only)
Installation of additional electrical/electronic
equipment such as a mobile two-way radio on or near the SRS airbag system componentsand/or wiring is not advisable. This could in-
terfere with proper operation of the SRS air- bag system.
CAUTION
Do not perform any of the following modifica- tions. Such modifications can interfere with proper operation of the SRS airbag system. Attachment of any equipment (brush bar,
winches, snow plow, skid plate, etc.) otherthan SUBARU genuine accessory parts to thefront end. Modification of the suspension system or
front end structure. Installation of a tire of different size and
construction from the tires specified on thetire placard attached to the driver ’s door jamb.
Attachment of any equipment (side steps or
side sill protectors, etc.) other than SUBARU genuine accessory parts to the side body (for
vehicles with side airbags only).
Always consult your SUBARU dealer if you want to
install any accessory parts to your vehicle.

Driving tips
8-35
– CONTINUED –
eral, state/province and/or other applicable regula- tions.
Trailer lights
Connection of trailer lights to your vehicle ’s electrical
system requires modifications to the vehicle ’s light-
ing circuit to increase its capacity and accommo-
date wiring changes. To ensure the trailer lights are
connected properly, please consult your SUBARU
dealer. Check for proper operation of the turn sig-nals, the brake lights and parking lights each timeyou hitch up.
CAUTION
Direct splicing or other improper connection
of trailer lights may damage your vehicle ’s
electrical system and cause a malfunction ofyour vehicle ’s lighting system.
Tires
Make sure that all the tires on your vehicle are prop-
erly inflated to the pressure specified on the tire
placard located on the left center pillar of your ve-hicle.
Trailer tire condition, size, load rating and proper
inflation pressure should be in accordance with the trailer manufacturer
’s specifications.
In the event your vehicle gets a flat tire when towing
a trailer, ask a commercial road service to repair the
flat tire.
If you carry a regular size spare tire in your vehicle
or trailer as a precaution against getting a flat tire,
be sure that the spare tire is firmly secured.
WARNING
Never tow a trailer when the temporary spare tire is used. The temporary spare tire is not
designed to sustain the towing load. Use ofthe temporary spare tire when towing canresult in failure of the spare tire and/or less
stability of the vehicle.
Trailer towing tips
CAUTION
Never exceed 45 mph (72 km/h) when tow-
ing a trailer in hilly country on hot days. When towing a trailer, steering, stability,
stopping distance and braking performancewill be different from normal operation. For

Maintenance and service
11-4
Always be very careful to avoid injury when
working on the vehicle. Remember that some of the materials in the vehicle may be hazard-
ous if improperly used or handled, for exam-ple, battery acid. Your vehicle should only be serviced by per-
sons fully competent to do so. Serious per-sonal injury may result to persons not experi-enced in servicing vehicles. Always use the proper tools and make cer-
tain that they are well maintained. Never get under the vehicle supported only
by a jack. Always use a safety stands to sup-port the vehicle. Never keep the engine running in a poorly
ventilated area, such as a garage or other
closed areas. Do not smoke or allow open flames around
the fuel or battery. This will cause a fire. Because the fuel system is under pressure,
replacement of the fuel filter should be per-
formed only by your SUBARU dealer. Wear adequate eye protection to guard
against getting oil or fluids in your eyes. If something does get in your eyes, thoroughly
wash them out with clean water. Do not tamper with the wiring of the SRS airbag system or seatbelt pretensioner sys-tem, or attempt to take its connectors apart,as that may activate the system or it can ren-der it inoperative. The wiring and connectorsof these systems are yellow for easy identifi-cation. NEVER use a circuit tester for these wiring. If your SRS airbag or seatbelt pretensionerneeds service, consult your nearest SUBARU
dealer.
Before checking or servicing in the
engine compartment
Always stop the engine and set the parking
brake firmly to prevent the vehicle from mov- ing. Always let the engine cool down. Engine
parts become very hot when the engine is run-
ning and remain hot for some time after theengine is stopped. Do not spill engine oil, engine coolant, brake
fluid or any other fluid on hot engine compo-nents. This may cause a fire. Always remove the key from the ignition
switch. When the ignition switch is in the
“ON” position, the cooling fan may operate

Maintenance and service
11-56
Fuses
CAUTION
Never replace a fuse with one having a higher
rating or with material other than a fuse be-
cause serious damage or a fire could result.
The fuses are designed to melt during an overload
to prevent damage to the wiring harness and electri-
cal equipment. The fuses are located in two fuseboxes.
One is located under the instrument panel behind the coin tray on the driver ’s seat side.