Lexus RX400h2006 Owner's Manual page 462

(k) Laser radar sensor
The laser radar sensor is used for vehicle−to−vehicle
distance control cruising.
If dirt is on the sensor glass, the dynamic laser cruise
control function is automatically cancelled and a warning
message "CLEAN RADAR SENSOR" appears on the
display. (See "(l) Vehicle−to−vehicle distance control
mode failure warning" on page 436.)
However, if the glass sensor is covered with ice or another
transparent substance, dirt may not be detected.
Before using the vehicle−to−vehicle distance control
mode, make sure the laser radar sensor glass is clean.
This product is a class I laser product complied with
21 C.F.R part 1040.10. and 1040. 11.
STARTING AND DRIVING
CAUTION
To ensure that dynamic laser cruise control will function
properly while driving, observe the following:
D Always keep the laser radar sensor glass clean.
When cleaning, use a soft cloth and be careful not to
damage the sensor.
D 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.
D Do not affix a sticker (including a transparent sticker)
or attach an accessory around the laser radar sensor.
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