2003 SUBARU IMPREZA ECU

Maintenance and service
11-17
– CONTINUED –
1) Rubber gaskets
3. After refilling the reserve tank and the radiator, re- install the caps and check that the rubber gaskets
inside the radiator cap are in the proper position.
CAUTION
Be careful not to spill engine coolant when
adding it. If coolant touches the exhaust pipe, it may cause a bad smell, smoke, and/or a fire. Do not splash the engine coolant over
painted parts. The alcohol contained in the en-gine coolant may damage the paint surface.
Changing the coolant
1) Drain plug
Change the engine coolant using the following pro-
cedures according to the maintenance schedule.
1. Remove the under cover.
2. Place a proper container under the drain plugand loosen the drain plug.
3. Loosen the radiator cap to drain the coolant from
the radiator. Then drain the coolant from the reserve
tank. Tighten the drain plug securely.

Maintenance and service
11-21
– CONTINUED –
1) Bolt
1. Remove the bolt securing the rear air cleaner ele-
ment case.
2. Unsnap the three clamps holding the rear air
cleaner element case.1) Air cleaner element
3. Separate the rear air cleaner element case from
the front cleaner element case and remove the air
cleaner element.
4. Clean the inside of the front and rear air cleaner
element cases with a damp cloth and install a new air cleaner element.
5. Insert the four projections on the rear air cleaner
element case into the slits on the front air cleaner
element case and snap the three clamps on the rearair cleaner element case and then tighten the bolt.

Maintenance and service
11-42
proach the curbs as squarely as possible. Also,
make sure the tires are not pressed against thecurb when you park the vehicle.If you feel unusual vibration while driving or
find it difficult to steer the vehicle in a straight
line, one of the tires and/or wheels may be dam- aged. Drive slowly to the nearest authorized
SUBARU dealer and have the vehicle inspected. Tire pressures and wear
Maintaining the correct tire pressures helps to maxi-
mize the tires ’ service lives and is essential for good
running performance. Check and, if necessary, ad-
just the pressure of each tire (including the spare) at least once a month (for example, during a fuel stop)
and before any long journey.
Check the tire pressures when the tires are cold.
Use a pressure gauge to adjust the tire pressures to
the values shown on the tire placard. The tire plac-
ard is located on the door pillar on the driver ’s side.
Driving even a short distance warms up the tires
and increases the tire pressures. Also, the tire pres-
sures are affected by the ambient temperature. It is
best to check tire pressure outdoors before driving the vehicle.
When a tire becomes warm, the air inside it ex-
pands, causing the tire pressure to increase. Be
careful not to mistakenly release air from a warm tire
to reduce its pressure.

Maintenance and service
11-70
prying the edge of the lens with a regular screwdriv-
er. At this time, use a cloth to protect the body from
being damaged by the screwdriver.
2. Remove the bulb holder from the front side mark-
er light assembly by turning it counterclockwise.
3. Pull the bulb out of the socket. Install a new bulb.
4. Set the bulb holder into the front side marker light
assembly and turn it clockwise until it locks.
5. Reinstall the front side marker light assembly
onto the side of the front fender. Rear combination lights
Sedan1. Remove the clip from the rear trunk trim with a
regular screwdriver.
1) Backup light
2) Rear turn signal light
3) Brake light 4) Tail light
5) Brake/tail light
2. Open the rear portion of the side trunk trim panel.
3. Remove the bulb holder from the rear combina-
tion light assembly by turning it counterclockwise.
4. Remove the bulb from the socket by pushing it
and turning counterclockwise. Install a new bulb.
5. Set the bulb holder into the rear combination light
assembly and turn it clockwise until it locks.
6. Secure the rear trunk trim panel with the clips.

Maintenance and service
11-71
– CONTINUED –
Wagon
1. Using a Phillips screwdriver, remove the upper
and lower screws that secure the side cover of the
rear combination light assembly.
2. Remove the upper and lower screws. Then, slide
the rear combination lamp assembly to the rear and
remove it from the vehicle.

Index
14-7
Spark plugs 11-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote keyless entry system 2-6 . . . . . . . . . . . . . . . . .
Replacement Brake pad and lining 11-39 . . . . . . . . . . . . . . . . . . . . . . . .
Windshield wiper blades 11-50 . . . . . . . . . . . . . . . . . . .
Replacing bulbs 11-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cargo area light 11-73 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Doom light 11-73 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front fog light 11-68 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front turn signal light 11-64 . . . . . . . . . . . . . . . . . . . . . . . .
Front side marker light 11-69 . . . . . . . . . . . . . . . . . . . . . .
Headlight 11-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High mount stop light 11-74 . . . . . . . . . . . . . . . . . . . . . . .
License plate light 11-72 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Map light 11-73 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking light 11-64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear combination light 11-70 . . . . . . . . . . . . . . . . . . . . . .
Trunk light 11-74 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing
Lost transmitters (keyless entry system) 2-10 . .
Air cleaner element 11-20 . . . . . . . . . . . . . . . . . . . . . . . . .
Battery (remote keyless entry system) 2-8 . . . . .
Rocking the vehicle 8-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Roof rail and crossbar 8-18 . . . . . . . . . . . . . . . . . . . . . . . . .
S Seatbelt 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance 1-27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pretensioners 1-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety tips 1-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warning light and chime 1-15, 3-10 . . . . . . . . . . . . . . .
Seatbelts 1-12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Cushion height adjustment (driver ’s seat) 1-5 .
Fabric 10-5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater 1-6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Security system 2-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selector lever 7-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift lock release 7-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift position indicator 3-15 . . . . . . . . . . . . . . . . . . . . . . . . .
Side ventilators 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Snow tires 8-13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sounding a panic alarm 2-8, 2-17 . . . . . . . . . . . . . . . . . . .
Spark plugs 11-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 12-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speedometer 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS airbag (Supplemental Restraint System airbag) 6, 1-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS airbag system warning light 3-11 . . . . . . . . . . . . . .
SRS frontal airbag 1-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS side airbag 1-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting the engine 7-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
State emission testing (U.S. only) 7-6 . . . . . . . . . . . . . . . .
Stopping the engine 7-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . .