BMW 3: Low-voltage Vehicle Electrical System
BMW 3 Series G20 (2018-2026) Training manual / Low-voltage Vehicle Electrical System
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Voltage supply
The 12 V vehicle electrical system of the G20 PHEV is essentially the same as
the electrical system of
the G20. The main difference lies in the fact that the power supply is no longer
by the al
Start-up system
Starter motor
The combustion engine B46 can be started via the conventional starter motor
and the electrical
machine.
The following table shows when and under which conditions the respective start
Terminal control for driving readiness
Terminal control from driver's view
Vehicle condition - DRIVING
Vehicle condition - RESIDING
Vehicle condition - PARKING
Transitional condition for establishing driving readiness,
ending driv
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Dual-mass flywheel
In order to reduce fuel consumption and CO2 emissions, high-charged engines
are used, the number
of cylinders is reduced and the drivable speeds are lowered.
However, with these measures the torsional vibrations of the crankshaft are
increased as a result of
the acceleration during the work cycle
Securing the vehicle against
rolling
General information
The vehicle manufacturer recommends to additionally
secure the vehicle against rolling away
when changing a wheel.
On a level surface
Place wheel chocks or other suitable objects in
front and behind the wheel that is diagonal to the
wheel to be changed.
On a slight downhill grad
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