Lexus RX 450h 2010 Owner's Manual page 177

2-1. Driving procedures
Automatic return to normal driving mode
■
If snow mode or EV drive mode is selected, the driving mode will automatically
return to normal mode when the hybrid system is turned off.
S mode
■
When the shift range is "5" or lower, holding the shift lever toward "+" sets the
●
shift range to "6".
To prevent the engine from over-revving, upshifting may automatically occur.
●
AI-SHIFT
■
AI-SHIFT automatically selects the optimal gear according to driver performance
and driving conditions.
AI-SHIFT automatically operates when the shift lever is in the D position. (Shifting
the shift lever to the S position cancels the function.)
When driving with the cruise control or dynamic radar cruise control
■
Engine braking will not occur in S mode, even when downshifting to "5" or "4".
(→P. 220, 224)
If the shift lever cannot be shifted from P
■
→P. 612
If S does not come on even after shifting the shift lever to S
■
This may indicate a malfunction in the hybrid transmission system. Have the vehicle
inspected by your Lexus dealer immediately.
(In this situation, the hybrid transmission will operate in the same as manner as when
the shift lever is in D.)
Downshift restriction warning buzzer (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 buzzer will sound twice.)
176