Volkswagen 2001 Passat, Manual

Page: 40 / 64

40
The Electrics
Until now, no single gas discharge headlight has
been capable of producing both low and high
beams. Hence, it was not possible to adjust the
light/dark boundary while driving.
A solenoid-operated mechanical shutter is used
to produce the xenon low and high beams.
This mechanism screens off a portion of the light
generated in the lamp to produce the low beam.
In the high beam setting, the mechanism allows
all of the light generated in the lamp to pass
through.
Lens
Reflector
Solenoid
251_311
Design of a BI-xenon headlight module
The headlight module comprises:
●
electronic ballast (EVG)
●
headlight range control motor
●
conventional light bulbs
●
gas discharge headlight module
●
housing with bonded clear glass lens
shutter
ballast
251_006
251_067
Gas discharge headlight