Roof systems
94
Body
Introduction of the smart fortwo, Model Series 451
Targa roof position
In the targa roof position, the folding top is fully
opened, the side supports are removed and the rear
soft top is closed.
The targa roof position is important with regard to the
operation of the folding top because the side
supports must be inserted before the folding top can
be closed. The side supports are detected by a
mechanical catch in the roof cassette lock.
Soft top control
The central controller unit of the soft top is the SAM
control unit.
The SAM control unit reads in the actuation request
from the power soft top switch and actuates the
appropriate motors depending on the position and
status of the soft top.
The soft top is powered by a total of three motors. A
central motor in the roof cassette is responsible for
opening and closing the folding top. The folding and
raising of the rear soft top is carried out by two
motors in the left and right main bearings of the soft
top.
The soft top also incorporates the center high-
mounted brake lamp and a glass rear window with an
integral rear window heater, which is also activated by
the SAM control unit.
Function sequence of soft top actuation
Function requirements:
• Switch circuit 15 ON
Pressing the power soft top switch sends a direct
signal to open or close to the SAM control unit. The
SAM control unit reads in the signal, checks whether
the function requirements are satisfied and deter-
mines the status of the soft top via the microswitches
installed on the soft top. If all the preconditions are
met, the SAM control unit actuates the appropriate
motor(s) for the desired operation.
P77.00-2340-00
Targa roof position
SN_Typ 451_us.book Seite 94 Freitag, 30. November 2007 1:56 13
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