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BULA REPLACEMENT
Headlamp
Unlts
HID
Xenon Headlamps: On cars iitted with High lniensity
Dis-
charge (HlD) headlamp
assembli€s,
th€ lighl sources
utilise a
plasma discharge arc
betlveen
two electrodes in
a
xenon
gas
envelope to provide a blue-white
lightfor
oplimal
illumination
of
the
roadway.
Each headlamp
unit uses
a
DlS
electronic igniter/
bumerunit(equivalenttolhe
bulb),
mount€d
in
a
specially coated
alloy
reflector, ahead of which
;s
lixed
a
glass
aspheric
lens.
A
ballast
unitoutputs
around 20,000 volts to
the
bumer, although
the
power consumption is only
35
Watts.
A bottom
pivoted
flap
is
used to
mask
the
upper
palt
ofihe
lighl
beam (i.e. lower
parl
in tront of
ihe
lamp, prior to
beam
inversion by the aspheric lens), and allow
a
single
lighl
source
to
provide
both main and dip beams.
arrrtGtllll
The high voltages produced by
the headlamp ballast unit
could causean electric
shock.
Ensure the battery
is
discon"
nected
betore
servicing
a headlamp as3smbly.
To
replace the bumer
unit,
first disconnect the battery
(see
page
143) to protect
from
electric
shocks.
Remove the
access
cover
in
the wheelarch
liner,
and
pull
ofiihe
protective bool
fiom
the back
of
the headlamp
housing.
Release the spring
wke
clip
and withdraw
lhe
bumer sufficiently to
altow
the
H.t
cabte
to
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