Toyota Avalon 2008 Quick Reference Manual page 158

2-1. Driving procedures
Down shifting restrictions warning buzzer (in the "S" mode)
n
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 is operated. (The warning buzzer will
sound twice.)
When driving with the cruise control system (or dynamic laser cruise
n
control system)
The engine brake will not operate in the "S" mode, even when downshifting
to "5" or "4". (→P. 149, 152)
If the shift lever cannot be shifted from "P"
n
→P. 393
If the "S" indicator does not come on even after shifting the shift lever
n
to "S" mode driving position
This may indicate a malfunction in the automatic transmission system. Have
the vehicle inspected by your Toyota dealer immediately.
(In this situation, the vehicle will operate as if the shift lever is in "D".)
AI-SHIFT
n
The AI-SHIFT automatically shifts the gear to the optimal position according
to the driver's input and driving conditions.
The AI-SHIFT automatically operates when the shift lever is in the "D" posi-
tion. (Shifting the shift lever to the "S" mode driving position cancels the func-
tion.)
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