Lexus LS460 2011 Owner's Manual page 208

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Downshifting restrictions warning buzzer
To help ensure safety and driving performance, downshifting operation may
sometimes be restricted. In some circumstances, downshifting may not be
possible even when the shift lever or paddle shift switch is operated. (A
buzzer will sound twice.)

When driving with the cruise control system
Engine braking will not occur during shift range selection in the "D" posi-
tion, even when downshifting to range "7", "6", "5" or "4". (P. 228, 232,
246)

Power mode and snow mode automatic deactivation
Power mode and snow mode are automatically deactivated if the "ENGINE
START STOP" switch is turned OFF after driving in power mode or snow
mode.

Operation of the air conditioning system in Eco drive mode
Eco drive mode controls the heating/cooling operations and fan speed of the
air conditioning system to enhance fuel efficiency. (P. 387) To improve
air conditioning performance, adjust the fan speed or turn off Eco drive
mode.

If the shift lever cannot be shifted from "P"
P. 725

If the automatic transmission fluid temperature warning message is dis-
played
If the automatic transmission fluid temperature warning message is dis-
played while driving, make sure you return to normal "D" position driving
and reduce speed by easing off the accelerator pedal. Stop the vehicle in a
safe place, shift the shift lever to the "P" position and let the engine idle
until the warning message goes out.
When the warning message goes out, the vehicle can be driven again.
If the warning message does not go out after waiting a while, have your
vehicle inspected by any authorized Lexus dealer or repairer, or another
duly qualified and equipped professional.

AI-SHIFT
The AI-SHIFT automatically selects the suitable gear according to driver
performance and driving conditions.
The AI-SHIFT automatically operates when the shift lever is in the "D"
position. (Shifting the shift lever to the "M" position cancels the function.)
The engine speed may remain high after releasing the accelerator pedal.
This does not indicate a malfunction.
LS460_EE
2-1. Driving procedures
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