Lexus LS 460 2017 Manual page 346

346
4-5. Using the driving support systems
Turning the LKA system on
Press the LKA switch to activate the
system.
LKA indicator will come on.
Press the switch again to turn the LKA
system off.
The LKA system will revert to off each
time the engine switch is turned to
IGNITION ON mode.