Toyota Avensis Owner's Manual page 334

2-4. Using other driving systems
Situations in which the pre-crash safety system does not function

properly
The system may not function effectively in situations such as the following:
 On roads with sharp bends or uneven surfaces
 If a vehicle suddenly moves in front of your vehicle, such as at an inter-
section
 If a vehicle suddenly cuts in front of your vehicle, such as when overtak-
ing
 In inclement weather such as heavy rain, fog, snow or sand storms
 When your vehicle is skidding with the VSC system off
 When the axis of the radar is out of adjustment
 When an extreme change in vehicle height occurs
 When there is a malfunction in the system
Warning lights and/or warning messages will turn on or flash. (P. 630)
 Automatic cancelation of the pre-crash safety system
When a malfunction occurs due to sensor contamination, etc. that results in
the sensors being unable to detect obstacles, the pre-crash safety system
will be automatically disabled. In this case, the system will not activate even
if there is a collision possibility.
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