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03 Instruments and controls
03
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* Option/accessory, for more information, see Introduction.
93
Active main beam*
Active main beam function is available with
on/off functionality, or adaptive functionality,
depending on headlamp variant. The function
detects the headlamp beams from oncoming
traffic or the rear lights of vehicles in front,
and switches the lighting from main beam to
dipped beam. Active main beam with adap-
tive functionality only dims the part of the light
beam that points directly to the vehicle. The
lighting returns to main beam when the
incoming light has stopped.
Active main beam - AHB
Active main beam (Active High Beam - AHB)
is a function which uses a camera sensor at
the top edge of the windscreen to detect the
headlamp beams from oncoming traffic or the
rear lights of vehicles in front, and then
switches from main beam to dipped beam.
The function can also take streetlights into
account.
Car with halogen headlamps
The lighting returns to main beam about a
second after the camera sensor no longer
detects the headlamp beams from oncoming
traffic or the rear lights from vehicles in front.
Car with active Xenon headlamps
If the active main beam has the on/off func-
tionality then the lighting returns to main
beam about a second after the camera sen-
sor no longer detects the headlamp beams
from oncoming traffic the rear lights of vehi-
cles in front.
If the active main beam has adaptive func-
tionality then, unlike what happens during
conventional dimming, the light beam contin-
ues to illuminate with main beam on both
sides of oncoming traffic or vehicles ahead -
only the part of the light beam that points
directly to the vehicle is dimmed.
Adaptive functionality: Dipped beam directly
toward oncoming vehicles, but continued main
beam on both sides of the vehicle.
The lighting returns to full main beam about a
second after the camera sensor no longer
detects the headlamp beams from oncoming
traffic or the rear lights from vehicles in front.
Activating/deactivating
AHB can be activated when the headlamp
control's knob is in position (provided
that the function has not been deactivated in
the menu system MY CAR, see MY CAR
(p. 114)).
Stalk switch and knob for headlamp control in
AUTO position.
The function can start while driving in the
dark when the car's speed is 20 km/h or
higher.
Activate/deactivate AHB by moving the left-
hand stalk switch towards the steering wheel
to the end position and then releasing. Deac-
tivation when main beam is on means that the
lights are reset directly to dipped beam.
Car with analogue combined instrument
panel
When AHB is activated the
symbol illu-
minates in the instrument's information dis-
play.
When main beam is switched on the
symbol also illuminates in the combined
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