Lexus LS460 2008 Owner's Manual page 220

2-4. Using other driving systems
Camera sensors
Driver monitor sensor
220
Detect pedestrians and other
three-dimensional objects on or
near the road ahead together with
the radar sensor while the vehicle
is moving. When the headlights
are on, near-infrared rays are pro-
jected to ensure proper detection
performance in the night time.
Camera sensors
Near-infrared ray transmitters
Detects the direction the driver is
facing. The system determines
whether the driver is facing for-
ward.