On-board electrical system/power supply
Electrical system
21
Introduction of the smart fortwo, Model Series 451
Alternator
The alternator supplies the electrical consumers
while the engine is running and recharges the battery
so that a subsequent engine start is possible.
The alternator is equipped with an overvoltage
protection function that limits the on-board power
supply voltage in the event of a defect in the
governor. The alternator is monitored by the ME-SFI
[ME] control unit.
The alternator is pre-excited via a direct line. The
alternator load is reported back to the ME-SFI [ME]
control unit over a separate line and monitored.
Instrument cluster
The on-board power supply voltage is monitored by
the engine control. If the voltage is < 11.5 V for a
period of over 3 min, a signal is sent over CAN to the
instrument cluster and the alternator charge moni-
toring and warning lamp (A1e5) lights up.
P54.10-2891-00
G2 Alternator
P54.32-5684-00
A1 Instrument cluster
A1e5 Alternator charge monitoring and warning lamp
SN_Typ 451_us.book Seite 21 Freitag, 30. November 2007 1:56 13
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