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4-5. Using the driving support systems
●
In the following situations, if the situation has changed (or the vehicle has
been driven for some time) and the normal operating conditions are
detected, the message will disappear and the system will become opera-
tional.
If the message does not disappear, contact your Toyota dealer.
• When the temperature around the radar sensor is outside of the opera-
tional range, such as when the vehicle is in the sun or in an extremely cold 
environment
•When the front camera cannot detect objects in front of the vehicle, such 
as when driving in the dark, snow, or fog, or when bright lights are shining 
into the front camera
•Depending on the conditions in the vicinity of the vehicle, the radar may 
judge the surrounding environment can not be properly recognized. In that
Situation Actions
When the area around a camera is 
covered with dirt, moisture (fogged 
up, covered with condensation, ice, 
etc.), or other foreign matter
Using the wiper and A/C function, 
remove the dirt and other attached 
matter. (P.413, 418)
When the temperature around the 
front camera is outside of the opera-
tional range, such as when the vehi-
cle is in the sun or in an extremely 
cold environment
If the front camera is hot, such as 
after the vehicle had been parked in 
the sun, use the air conditioning sys-
tem to decrease the temperature 
around the front camera.
If a sunshade was used when the 
vehicle was parked, depending on its 
type, the sunlight reflected from the 
surface of the sunshade may cause 
the temperature of the front camera 
to become excessively high.
If the front camera is cold, such after 
the vehicle is parked in an extremely 
cold environment, use the air condi-
tioning system to increase the tem-
perature around the front camera.
The area in front of the front camera 
is obstructed, such as when the 
hood is open or a sticker is attached 
to the part of the windshield in front 
of the front camera.
Close the hood, remove the sticker, 
etc. to clear the obstruction.
When “Pre-Collision System 
Unavailable” is displayed.
Check whether there is attached 
materials on the radar sensor and 
radar sensor cover, and if there is, 
remove it.
case, “Pre-Collision System Unavailable” is displayed.