Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 673
LI-15
Headlight Assembly
LIGHTING SYSTEM
12.Headlight Assembly
A: REMOVAL
WARNING:
Because the headlight system uses high volt-
age, be careful not to perform work with wet
hands. There is a possibility of electrical shock.
CAUTION:
The HID headlight uses very high voltages for
the lighting circuit. Make sure that the power is
turned OFF before working.
1) Disconnect the ground cable from battery.
2) Remove the clips and remove the air intake duct.
(When removing the headlight RH)
3) Remove the front bumper face. <Ref. to EI-31,
FRONT BUMPER FACE, REMOVAL, Front
4) Disconnect harness connectors.
5) Remove the bolts and clips, and remove the
headlight assembly.
B: INSTALLATION
1) Install each part in the reverse order of removal.
Tightening torque:
7.5 N·m (0.76 kgf-m, 5.5 ft-lb)
2) Adjust the headlight beam and fog light beam.
• Adjust the headlight beam. <Ref. to LI-16,
HEADLIGHT BEAM ADJUSTMENT, ADJUST-
• Adjust the fog light beam. (Model with fog light)
<Ref. to LI-21, FOG LIGHT AIMING, ADJUST-
MENT, Front Fog Light Assembly.>
C: DISASSEMBLY
1. HID HEADLIGHT BALLAST
WARNING:
Because the headlight system uses high volt-
age, be careful not to perform work with wet
hands. There is a possibility of electrical shock.
CAUTION:
• The HID headlight uses very high voltages for
the lighting circuit. Make sure that the power is
turned OFF before working.
• Do not leave the headlight without the ballast
for a long time. Dust, moisture, etc. entering the
headlight may affect its performance.
1) Disconnect the ground cable from battery.
2) Remove the headlight assembly. <Ref. to LI-15,
3) Remove the back cover.
4) Disconnect the bulb connector.
5) Remove the harness connector and screws to
pull out the ballast.
IN-02274
LI-00801
LI-00802
LI-00803
LI-00804
LI-16
Headlight Assembly
LIGHTING SYSTEM
6) Remove the harness connector and screws on
the back to remove the headlight ballast.
D: ASSEMBLY
1. HID HEADLIGHT BALLAST
CAUTION:
• When installing the ballast cover, be sure to
install the gasket.
• After installing the ballast to the vehicle, be
sure to perform beam adjustment.
Assemble each part in the reverse order of disas-
sembly.
Tightening torque:
1.3 N·m (0.13 kgf-m, 0.96 ft-lb)
NOTE:
Adjust the projector lens to near the center of the
extension opening before installing the ballast. This
makes the beam adjustment work easier.
E: ADJUSTMENT
1. HEADLIGHT BEAM ADJUSTMENT
CAUTION:
Turn off the light before adjusting the headlight
beam level. If it is necessary to inspect the
beam level, do not keep the light on for two min-
utes or more.
1) Before checking the headlight beam level, be
sure of the following:
• The area around the headlight has not sustained
any scratches, damage or other type of deforma-
tion.
• Vehicle is parked on a level surface.
• The inflation pressure of tires is correct.
• Vehicle’s fuel tank is fully filled.
2) For vehicle with a manual leveler, set the head-
light beam leveler switch to the “0” position.
3) Bounce the vehicle several times to normalize
the suspension.
4) Make certain that someone is seated in the driv-
er’s seat.
5) Measure the distance between the low beam
bulb centers and the height of the bulb center.
6) Turn the headlights on and then adjust the low
beam pattern.
(1) Adjust the vertical beam level (A).
(2) Adjust the horizontal beam level (B).
LI-00805
(A) Vehicle center
(B) Bulb center marking
(C) 3 m (10 ft)
(D) Height of headlight center
W mm (in)
h mm (in) at 3 m (10 ft)
1,160 (45.67)
30 (1.18)
LI-00806
(B)
(A)
LI-00941
W
W2
W1
(A)
(C)
(B)
h
(D)
W1
W
W2
(A)
h
(D)
LI-17
Headlight Bulb
LIGHTING SYSTEM
13.Headlight Bulb
A: REMOVAL
1. HIGH BEAM & HALOGEN TYPE LOW
BEAM
WARNING:
Because the headlight system uses high volt-
age, be careful not to perform work with wet
hands. There is a possibility of electrical shock.
CAUTION:
• Because the halogen bulb operates at a high
temperature, dirt and oil on the bulb surface re-
duces the bulb’s service life. Hold the flange
portion when replacing the bulb. Never touch
the glass portion.
• Do not leave the headlight without a bulb for
a long time. Dust, moisture, etc. entering the
headlight may affect its performance.
1) Disconnect the ground cable from battery.
2) Remove the clips and remove the air intake duct.
(When removing the headlight bulb RH)
3) Remove the battery cover. (When removing the
headlight bulb LH)
4) Tilt the washer tank filler neck. (When removing
the headlight bulb LH)
5) Disconnect the bulb connector.
6) Remove the bulb assembly (A) then remove the
high beam. To remove the low beam, remove the
back cover (B), and then go to step 7.
7) Remove the bulb connector and retaining spring
(A), and remove the bulb.
2. HID TYPE LOW BEAM
WARNING:
Because the headlight system uses high volt-
age, be careful not to perform work with wet
hands. There is a possibility of electrical shock.
CAUTION:
• Because the HID lighting circuit uses high
voltage, be sure to confirm that the power sup-
ply is turned off before operation.
• When replacing bulb, hold the flange area. Be
careful not to touch the glass area.
• Do not leave the headlight without a bulb for
a long time. Dust, moisture, etc. entering the
headlight may affect its performance.
1) Disconnect the ground cable from battery.
2) Remove the headlight assembly. <Ref. to LI-15,
3) Remove the back cover.
4) Disconnect the bulb connector.
IN-02274
LI-00807
(A)
(B)
LI-00808
(A)
LI-00802
LI-00803
LI-18
Headlight Bulb
LIGHTING SYSTEM
5) Remove the retaining spring of bulb, and remove
the bulb.
B: INSTALLATION
Install each part in the reverse order of removal.
C: INSPECTION
1. HALOGEN TYPE
WARNING:
Because the headlight system uses high volt-
age, be careful not to perform work with wet
hands. There is a possibility of electrical shock.
CAUTION:
• Because the halogen bulb operates at a high
temperature, dirt and oil on the bulb surface re-
duces the bulb’s service life. Hold the flange
portion when replacing the bulb. Never touch
the glass portion.
• Do not leave the headlight without a bulb for
a long time. Dust, moisture, etc. entering the
headlight may affect its performance.
1) Visually check the bulb for blow out.
2) Check the bulb specification. <Ref. to LI-2,
SPECIFICATION, General Description.>
3) Replace the bulb if it is found defective.
2. HID TYPE
WARNING:
Because the headlight system uses high volt-
age, be careful not to perform work with wet
hands. There is a possibility of electrical shock.
CAUTION:
• When lit (lighting switch is ON), do not touch
the harness, light internals, or metal parts of
the light.
• When performing a lighting test, make sure
that the headlight is mounted on the vehicle,
and the power supply is connected to the con-
nector on the vehicle’s side.
1) Check the bulb specification. <Ref. to LI-2,
SPECIFICATION, General Description.>
2) Install the factory HID bulb to check whether it
lights properly.
3) If it fails to illuminate normally, replace the bulb
with a new part.
4) Inspect the HID ballast.
Inspect the ballast in the following manner, and de-
termine whether or not to reuse.
(1) Perform cold starts (light the headlight after
turning off for 10 minutes or more), and hot
starts (light the headlight for 15 minutes or
more, then turn off for 1 minute and relight) sev-
eral times, to make sure that the headlight lights
properly.
(2) Monitor the lighting condition right after a
cold start up to a stable state (approx. 5 min.), to
see if there are any unstable conditions such as
flickering.
(3) Install bulbs with the same number of oper-
ating hours on both headlights, and light for ap-
proximately 30 minutes. Check for whether
there is a difference in brightness on the right
and left sides.
5) Replace the ballast if it is found defective.
LI-00809
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