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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Stationary cooling
Owing to the fact that the air conditioning compressor in the G20 PHEV is
electrically operated and
that the high-voltage battery unit has high energy and power densities, a
stationary climate control
function is offered to the customer in the G20 PHEV. For stationary air
conditioning,
Overview
G20 PHEV, system overview of climate control - Installation locations
Combined expansion and shutoff valve at the evaporator
Combined expansion and shutoff valve at the high-voltage battery unit
High-voltage battery unit
Refrigerant lines to high-voltage battery unit
Evaporator, passenge
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