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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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