Toyota 2014 Venza Owner's Manual page 182

2-1. Driving procedures
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Downshifting restrictions warning buzzer (in the S mode)
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.)
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When driving with cruise control system
Even when performing the following actions with the intent of enabling
engine braking, engine braking will not activate while driving in S mode and
downshifting to 5 or 4 because cruise control will not be canceled. (P. 227)
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If the shift lever cannot be shifted from P
P. 467
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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.)
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