Radar sensor
Lexus GX / Lexus GX Owners Manual / When driving / Using other driving systems / PCS (Pre-Collision System) / Radar sensor
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.

See also:
Steps to take in an emergency
If a warning light turns on or a warning buzzer sounds...
Calmly perform the following actions if any of the warning lights comes on
or flashes. If a light comes on or flashes, but then goes off, th ...
Audio/video system operating hints
NOTICE
To avoid damage to the audio/video system:
Be careful not to spill beverages over the audio/video system.
Do not put anything other than an appropriate discs into the CD changer or DVD
cha ...
