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Protective boot
BULB REPLACEMENT
Headlamp Units
HID Xenon Headlamps: On cars fitted with High Intensity Discharge
(HID) headlamp assemblies, the light sources utilise a plasma
discharge arc between two electrodes in a xenon gas envelope
to provide a blue-white light for optimal illumination of the road-
way. Each headlamp unit uses a D1S electronic igniter/burner
unit (equivalent to the bulb), mounted in a specially coated alloy
reflector, ahead of which is fixed a glass aspheric lens. A bal-
last unit outputs around 20,000 volts to the burner, although the
power consumption is only 35 Watts.
A bottom pivoted flap is used to mask the upper part of the
light beam (i.e. lower part in front of the lamp, prior to beam
inversion by the aspheric lens), and allow a single light source
to provide both main and dip beams.
WARNING
The high voltages produced by the headlamp ballast unit could
cause an electric shock. Ensure the battery is disconnected
before servicing a headlamp assembly.
To replace the burner unit, first disconnect the battery (see
page 145) to protect from electric shocks. Remove the access
cover in the wheelarch liner, and pull off the protective boot from
the back of the headlamp housing. Release the spring wire clip
and withdraw the burner sufficiently to allow the H.T. cable to
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Spring clip
HID burner unit
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