BMW 3: Low-voltage Vehicle Electrical System
BMW 3 Series G20 (2018-2025) 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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Welcome lights
General information
Depending on the equipment, the exterior lighting
of the vehicle can be set individually.
Activating/deactivating
Via iDrive:
1. "CAR".
2. "Settings".
3. "Exterior lighting".
4. Select the desired setting:
"Welcome and goodbye"
When unlocking the vehicle, individual
light
Service information
Electronic emergency gearbox release
As with the conventional 8-speed automatic transmission, the GA8P75HZ also
has an electrical
emergency release option.
In conventional vehicles the starter motor rotates for this, and also drives the
mechanical transmission
oil pump via the torque converter. W
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