Lexus 2003 LS Owner's Manual page 281

Laser radar sensor
31L164c
The laser radar sensor is used for vehicle–to–vehicle
distance control cruising. When the laser radar sensor is
disabled for some reason, the warning message appears
on the multi–information display. For details, see
"Vehicle–to–vehicle distance control mode failure
warning" on page 268.
This product is a class I laser product complied with 21
C.F.R part 1040.10.
STARTING AND DRIVING
CAUTION
To ensure that the dynamic laser cruise control system
will function properly while driving, observe the
following:
A Always keep the laser radar sensor glass clean.
When cleaning, use a soft cloth and be careful not to
damage the sensor.
A Avoid strong impacts around the laser radar sensor.
An incorrect laser radar sensor alignment will result
in system malfunction. A special device is required
to adjust the laser radar sensor alignment. Be sure
to have the sensor adjusted by your Lexus dealer.
A Do not affix a sticker (including a transparent sticker)
or attach an accessory around the laser radar sensor.
267