BMW 3: High-voltage connections
BMW 3 Series G20 (2018-2025) Training manual / Electrical Machine Electronics / Connections / High-voltage connections
At the Electrical Machine Electronics, there is a total of three high-voltage connections to connect the lines for other high-voltage components. The connections for the electric A/C compressor and the electrical heating are on the convenience charging electronics.
The following simplified wiring diagram shows the high-voltage connections between the Electrical Machine Electronics and the other high-voltage components.
High-voltage connections of the Electrical Machine Electronics
- Electrical heating
- Electric motor
- High-voltage battery unit
- 12 V battery
- Charging socket
- Electric A/C compressor
- Unidirectional AC/DC converter
- Convenience charging electronics
- Electrical Machine Electronics
- Bidirectional DC/AC converter
- Unidirectional DC/DC converter
- Anti-overload current guard (90 A)
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High-voltage cables
The high-voltage cables connect the high-voltage components and are
identified by orange cable
sleeves. The manufacturers of hybrid cars have agreed on a uniform
identification of the high-voltage
c
Removing the flat high-voltage connector
Bridge for high-voltage interlock loop
Before the high-voltage connector can be
disconnected, the bridge for the high-voltage
interlock loop must first be removed. The bridge
closes the circuit
Removing the round high-voltage connector
The following figures show the approach for releasing the round high-voltage
connector, as used
for example on the high-voltage cable from the Electrical Machine Electronics to
the convenience
charg
SEE MORE:
Climate Control
As in previous BMW hybrid vehicles, an electrically powered air conditioning
compressor is used in
the G20 PHEV. Because the A/C compressor has an electric motor, it is possible
to operate the air
conditioning independently of the combustion engine. Thus the customer can enjoy
the cooling ef
Power windows
Safety information
Warning
When operating the windows, body parts and
objects can be jammed. There is a risk of injury
or risk of damage to property. Make sure that
the area of movement of the windows is clear
during opening and closing.
Overview
Power windows
Safety switch
Functional requirements
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