Lexus 2013 IS250 Owner's Manual page 235

233
4-5. Using the driving support systems
If the engine switch is turned off and then turned to IGNITION ON mode
again, the vehicle will automatically return to vehicle-to-vehicle distance con-
trol mode.
Adjusting the speed setting:P. 224
Canceling and resuming the speed setting: P. 224
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IS250_EE(OM53B11E)