Toyota Matrix 2009 Owner's Manual page 325

2-1. Driving procedures
Downshifting restrictions (multi-mode type)
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 (if equipped)
n
Standard type
Engine braking will not occur when downshifting from D to 3. (→P. 132)
Multi-mode type
Engine braking will not occur when downshifting from D to 4 range of S, or
from 5 to 4 range of S. (→P. 132)
If the shift lever cannot be shifted from P
n
→P. 377
n 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 vehicle will operate as if the shift lever is in D.)
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