Lexus CT200h Owner's Manual page 268

2-4. Using other driving systems
Disabling pre-collision braking
Radar sensor
268
CT200h_U (OM76040U)
Pre-collision braking disabled
Pre-collision braking enabled
The "PCS" warning light will
turn on when pre-collision brak-
ing is disabled.
The radar sensor detects vehicles
or other obstacles on or near the
road ahead and determines
whether a collision is imminent
based on the position, speed, and
heading of the obstacles.