Toyota 2012 Matrix Owner's Manual page 110

2-1. Driving procedures
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Downshifting restrictions warning buzzer (S mode in multi-mode type)
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 the cruise control system (if equipped)
Standard type
Engine braking will not operate, even when downshifting to 3. (→P. 148)
Multi-mode type
Engine braking will not operate in the S mode, even when downshifting to 4.
(→P. 148)
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If the shift lever cannot be shifted from P
→P. 439
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If the "S" indicator does not come on even after shifting the shift lever
to S (multi-mode type)
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.
Standard type
AI-SHIFT automatically operates when the shift lever is in the D position.
Multi-mode type
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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