Toyota Prius V 2016 Manual page 231

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LDA indicator
Even if the LDA switch is pressed, when the LDA indicator does not come on
the system may have a malfunction. Have the vehicle inspected by your Toy-
ota dealer immediately.
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Alert buzzer for lane departure alert
Depending on the audio system sound level or air conditioning fan noise
while the audio system or air conditioning system is in use, it may be difficult
to hear the alert buzzer.
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After the vehicle has been parked in the sun
The LDA may not be available and a warning message will be displayed for a
while after driving has started. When the temperature in the cabin decreases
and the temperature around the camera sensor (P. 227) becomes suitable
for its operation, turn the LDA switch on again after a short time.
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If there are lane markers on only one side of the vehicle
The lane departure alert will not operate for the side on which lane markers
could not be recognized.
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Conditions in which the function may not operate correctly
In the following situations, the camera sensor may be unable to recognize
lane markers causing the lane departure alert function to operate incorrectly.
However, this does not indicate a malfunction.
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When there are shadows on the road running parallel with lane markers, or
if a shadow covers the lane markers
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When driving through an area with no lane markers, such as a toll booth, a
crossing or before a ticket checkpoint
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When the lane markers are broken, Botts' dots (raised pavement markers)
or stones
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When lane markers are obscured or partially obscured by sand, dirt, etc.
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When driving on a road surface that is wet due to rain, previous rainfall,
standing water, etc.
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When the lane markers are yellow (These may be more difficult for the sys-
tem to recognize compared to white markers.)
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When the lane markers are on a curb, etc.
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When driving on a particularly bright road surface, such as concrete
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When driving on a road surface that is bright due to reflected light
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When driving in a location where the light level changes rapidly, such as the
entrance to or exit from a tunnel
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When sunlight or the headlights of oncoming vehicles are shining directly
into the camera lens
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When driving on roads that are branching or merging
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When driving on winding roads or roads that are uneven
PRIUS v_OM_OM47B12U_(U)
4-5. Using the driving support systems
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