Toyota Lexusc Owner's Handbook Manual page 74

Automatic headlight leveling system
(vehicles with discharge headlight only)
Vehicle position changes according to loading condition,
passengers getting on and off, vehicle acceleration and
deceleration, etc. However, the headlight beam level is always
maintained automatically by the system at the proper level so
that your headlights do not dazzle other road users.
If this system fails, the warning light in the instrument cluster
comes on. If this occurs, have your vehicle checked by your
Lexus dealer.
If you replace the rear suspension, contact your Lexus dealer
to check the automatic headlight leveling system and headlight
beam level.
Adaptive front-lighting system
Adaptive front-lighting system (AFS) provides the proper
headlight beam level according to the current driving
conditions. This system moves the headlight beam left or right
according to the turning angle of the steering wheel. The
synergy of this system and the automatic headlight leveling
system improves visibility at the intersections and curves.
The system operates when the vehicle speed rises above 30
km/h (18 mph), and stops when the vehicle speed drops below
5 km/h (3 mph).
The system can operate within the limited range of the steering
wheel turning angle.
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