Lexus 2013 IS250 Owner's Manual page 247


Temporary cancelation of the LDA system functions
If any of the following occurs, the LDA system functions will be temporarily
canceled. The functions will resume after the necessary operating conditions
have returned.

The turn signal lever is operated.

The vehicle speed deviates from the operating range of the LDA system func-
tions.

When the lane lines cannot be recognized while driving.

When the lane departure warning sounds.
The lane departure warning function will not operate again for a several sec-
onds after it has been activated, even if the vehicle leaves the lane again.

The lane departure warning
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 warning sound.

After the vehicle has been parked in the sun
The LDA system may not be available and a warning message (P. 485) 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. 242) becomes suit-
able for its operation, the functions will begin to operate.

If there are lane markers on only one side of the vehicle
The lane departure warning will not operate for the side on which lane markers
could not be recognized.

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 warning function to operate incorrectly. How-
ever, this does not indicate a malfunction.

When driving through an area with no lane markers, such as a tollbooth, a
crossing or before a ticket checkpoint

When driving on a sharp curve

When lane markers are extremely narrow or extremely wide

When the vehicle leans to one side an unusual amount due to a heavy load or
improper tire inflation pressure

When the following distance between your vehicle and the vehicle ahead is
extremely short

When the lane markers are yellow (These may be more difficult for the system
to recognize compared to white markers.)

When the lane markers are broken, Botts' dots (raised pavement markers) or
stones

When the lane markers are on a curb etc.

When lane markers are obscured or partially obscured by sand, dirt, etc.

When there are shadows on the road running parallel with lane markers, or if a
shadow covers the lane markers

When driving on a particularly bright road surface, such as concrete
IS250_EE(OM53B11E)
4-5. Using the driving support systems
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