TOYOTA 2012 Avalon - Manual (Page 147)

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2-1. Driving procedures
2
Wh
en drivin
g
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If the S indicator does not come on even after shifting the shift lever 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 transmission will operate in the same manner as when
the shift lever is in D.)
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AI-SHIFT
AI-SHIFT automatically selects the suitable gear according to driver perfor-
mance and driving conditions.
AI-SHIFT automatically operates when the shift lever is in the D position.
(Shifting the shift lever to the S mode driving position cancels the function.)