Lexus LX 570 2009 Manual page 174

2-1. Driving procedures
"S" mode
■
When the shift range is "5" or lower, holding the shift lever toward "+" sets the shift
range to "6".
Downshifting restrictions warning buzzer (in the "S" mode)
■
To help ensure safety and driving performance, downshifting operation may some-
times be restricted. In some circumstances, downshifting may not be possible even
when the shift lever is operated. (The warning buzzer will sound twice.)
When driving with the cruise control system
■
The engine brake will not operate in the "S" mode, even when downshifting to "5" or
"4". (P. 203, 207)
Second start mode automatic deactivation
■
Second start mode is automatically deactivated if the engine is turned off after driv-
ing in second start mode.
If the shift lever cannot be shifted from "P"
■
P. 675
If the "S" indicator does not come on even after shifting the shift lever to "S"
■
This may indicate a malfunction in the automatic transmission system. Have the
vehicle inspected by your Lexus dealer immediately. 
(In this situation, the vehicle will operate as if the shift lever is in "D".)
AI-SHIFT
■
The AI-SHIFT automatically shifts the gear to the optimal position according to the
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 "S" position cancels the function.)
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