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Electrical system 23
9-5
Automatic headlight beam adjustment
Cars with the Bi-Xenon headlight system are
equipped with automatic headlight beam
adjustment. The control system ensures that the
headlights are always at an optimum angle
during acceleration, braking and at varying loads.
When the front of the car lifts during fast
acceleration, the headlights will be angled down
and during heavy braking when the front of the
car dips, they will be angled up. The correct
angle is maintained even when the car is heavily
loaded.
The headlight beam adjustment system is
equipped with two load angle sensors located by
the front and rear axle respectively. These Hall
sensors detect whether the front of the car is
lifting or dipping. The two AHL control modules,
one for each headlight, receive information on the
car's movement from the load angle sensor and
instruct the motors to adjust the angle of the
headlights.
The system is calibrated when the xenon lamps
are ignited by angling down the headlights to
their lowest position and then up again to their
normal position.
In the event of a system malfunction, the
headlights will be adjusted to a position slightly
below normal and an indicator lamp in the
dashboard will come on.
Headlight beam adjustment motor
There is a stepping motor located in each
headlight housing. The headlight beam
adjustment motors change the angle of the
headlights according to instructions from the AHL
control module.