Toyota Avensis Owner's Manual page 312

2-4. Using other driving systems
NOTICE
 Conditions which may affect the rear view monitor system
 If the back of the vehicle has been hit, the camera's position and mounting
angle may have been changed. Contact any authorized Toyota dealer or
repairer, or another duly qualified and equipped professional.
 Rapid temperature changes, such as when hot water is poured on the
vehicle in cold weather, may cause the system to function abnormally.
 If the camera lens is dirty, it cannot transmit a clear image. Rinse with
water and wipe with a soft cloth. If extremely dirty, wash with a mild
cleanser and rinse.
 The displayed image may be darker and moving images may be slightly
distorted when the system is cold.
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