Lexus LS460 2011 Owner's Manual page 350

2-4. Using other driving systems

Notes for the pre-support function

If the detected parking space is too small, guidance will not start.

To allow the pre-support system to activate accurately, move the vehicle
as slowly as possible (at a speed that will allow the vehicle to stopped
suddenly).

The function cannot be used if the shift position is in "P" or "R" posi-
tion, or if the vehicle speed is greater than 15 km/h (9 mph).

In order to identify parking spaces and detect parked vehicles using the
sensors on both sides of the front bumper, guidance cannot be given if a
space is not detected.

Parking space guidance and searching continues until the vehicle speed
is greater than 15 km/h (9 mph) or until the function is turned off by
pushing the pre-support switch.

Perpendicular parking: The pre-support function can only be used for
perpendicular parking when a vehicle is parked beside the target parking
space on the side closest to your vehicle as it approaches.
Parallel parking: The pre-support function can only be used for parallel
parking when vehicles are parked both in front of and behind the target
parking space.

Detecting white lines in parking assist mode (perpendicular parking)
If there are no vehicles parked on either side of the target parking space
when your vehicle stops, an approximate parking space location is identi-
fied, and the white lines in that location are detected. For this reason, stop-
ping in front of the parking space will make the detection of target parking
space's white lines easier.
Successful detection of the parking space's white lines may not be possible,
depending on the shape of the line.
In the following circumstances, detection of the parking space lines on the
road surface may not be possible:

The lines are faded or dirty, making them unclear.

The road surface is of a light color which does not contrast well with the
white lines.

The parking space lines are a color other than white (yellow etc.).

The area is dark, for example at night or in a covered parking lot.
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