Adaptive Front lighting System (AFS) is used when for example if it was day time and you entered a dark parking garage the lights would detect and adapt to the lighting environment which will then automatically trigger the Bi-xenon headlights to turn on themselves in order to illuminate the road ahead when the vehicle anticipates it is necessary. It is an automatic feature which turns on by itself for your convenience therefore you wont have to induce any actions, the car does it all for you. And most Importantly (I quote) "the Adaptive Front lighting System (AFS) automatically controls the headlight lighting pattern according to steering angle and vehicle speed to help provide better visibility at night."
Switch labelled 'AFS OFF' is present down near the fuel door release.'AFS' means Adaptive Front lighting System (at night with the Bi-Xenon headlights) it swivels either side, pressing that button means they stay pointing straight ahead and don't turn when you turn the steering wheel.
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I just pushed the AFS off button right above the gas cover opener, and the light went away. 
When you turn the wheel the headlights follow.
SOURCE: what does AFS inoperative mean on the dash lights
Thanks for contacting FixYa,
This is a possible sensor malfunction - related to Suspension Height circuit.
Whenever a warning light of this nature is displayed, your vehicle's onboard diagnostic OBDII will have store the appropriate Trouble Codes.
Your local Lexus Dealership will be able to connect their handheld scanner to your vehicle's computer, which will then tell them where the problem lies.
Lexus will then direct you on the appropriate action.
Kind regards,
TF
SOURCE: 'AFS off' light on dash what does it mean and how do
Hi there,
This is a possible sensor malfunction - related to Suspension Height circuit.
Whenever a warning light of this nature is displayed, your vehicle's onboard diagnostic OBDII will have store the appropriate Trouble Codes.
Your local Lexus Dealership will be able to connect their handheld scanner to your vehicle's computer, which will then tell them where the problem lies (this would take less than 30mins to diagnose - marvellous machines they are!)
Lexus will then direct you on the appropriate action.
Cheers,
"If this has helped you in any way, please rate this solution" :-)
Cluster warning lights
Whenever this warning or any other stays on in the dash it is indicating that the systems control module has detected a fault, it then disables the system as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)
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If it is OFF how do I turn it on?
I WANT TO KNW ID THE AFS LIGHT SHOULD BE TURNED ON OR OFF WHILE DRIVING
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