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:
Second Scheduled Maintenance Service
Second Scheduled Maintenance Service:
12 Months or 10,000 Miles
This complimentary service is performed at 12 months or 10,000 miles, whichever
occurs first. To obtain this service, contact your L ...
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 ...
Stop the vehicle immediately.
The following warning indicates the possibility of damage to the vehicle that
may lead to an accident. Immediately stop the vehicle in a safe place and contact
your Lexus dealer.
...
