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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Rear collision preparation
Concept
The system reacts to vehicles approaching from
behind.
General information
Two radar sensors in the rear bumper monitor
the area behind the vehicle.
When a vehicle approaches from the rear at a
certain speed, the system responds as follows:
Active Protection: when a
collision seems to b
System limits
Detection range
The detection capacity of the system and the
automatic braking capacity are limited.
Two-wheeled vehicles for instance might not be
detected.
Deceleration
The system does not decelerate in the following
situations:
For pedestrians or similarly slow-moving road
users.
For red tr
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