Toyota 2014 Sienna Manual page 341

Disabling pre-collision braking
Radar sensor
SIENNA_OM_OM45483U_(U)
2-4. Using other driving systems
Pre-collision braking disabled
Pre-collision braking enabled
The "PCS" warning light will turn
on when pre-collision braking 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.
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