Toyota prius Owner's Manual page 325

Disabling pre-crash braking
Radar sensor
PRIUS_OM_OM47871E_(EE)
2-4. Using other driving systems
Pre-crash braking enabled
Pre-crash braking disabled
The "PCS" warning light will
turn on when pre-crash brak-
ing is disabled.
The radar sensor detects vehi-
cles or other obstacles on or
near the road ahead and deter-
mines whether a collision is
imminent based on the position,
speed, and heading of the obsta-
cles.
2
325