Toyota Lexusc Owner's Handbook Manual page 477

STARTING AND DRIVING
D If the camera lens becomes dirty, it cannot transmit
a clear image. If water droplets, snow, or mud adhere
to the lens, rinse with water and wipe with a soft cloth.
If the lens is extremely dirty, wash it with a mild
cleanser and rinse.
D The displayed image may become darker and moving
images may be slightly distorted when the system is
cold. When backing up, be sure to check behind and
all around the vehicle visually and with mirror before
proceeding.
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AREA DISPLAYED ON SCREEN
Image is displayed approximately level on screen.