BMW 3 Owners & Service Manuals

BMW 3: 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 alternator, but by the high-voltage electrical system. The high voltage of the high-voltage battery unit is converted to the lower voltage (approximately 14 V) using a DC/DC converter in the Electrical Machine Electronics (EME). The electric voltage supply of the 12 V vehicle electrical system is thus no longer dependent on the engine speed of the combustion engine when driving.

Another difference is that the starter motor and auxiliary battery form an independent 12 V vehicle electrical system, which is connected to the standard 12 V vehicle electrical system by the charging unit for the auxiliary battery (Battery Charge Unit (BCU) ).

System overview

Voltage supply
G20 PHEV, system wiring diagram, 12 V voltage supply

  1. Digital Motor Electronics (DME)
  2. Integrated supply module (PDM)
  3. Starter motor
  4. Power distribution box, engine compartment
  5. Jump start terminal point
  6. Electric motor
  7. Electric Motor Electronics (EME)
  8. Power distribution box, inner
  9. Body Domain Controller (BDC)
  10. Charger unit for auxiliary battery (Battery Charge Unit)
  11. Hybrid-specific fuse
  12. Power distribution box, rear
  13. Hybrid power distribution box
  14. Safety battery terminal 2 (SBK2)
  15. Auxiliary battery
  16. Intelligent battery sensor 2 (IBS2)
  17. Intelligent Battery Sensor (IBS)
  18. Battery
  19. Safety battery terminal (SBK)
  20. Power distribution box, front left

    READ NEXT:

     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

     Bus Systems

    The bus systems of the G20 PHEV are based on the bus systems of the G20. All the main and sub-bus systems of the G20 are also used in the G20 PHEV. Compared to the bus systems of the G20,

    SEE MORE:

     DSC Dynamic Stability Control

    Concept Within the physical limits, the system helps to keep the vehicle on a steady course by reducing engine speed and by braking the individual wheels. General information DSC detects the following unstable driving conditions, for instance: Fishtailing, which can lead to oversteering. Loss of

     Areas to be avoided

    Concept Areas that should be driven around can be specified as areas to be avoided. General information Stored areas to be avoided can be activated and deactivated. Defining an area to be avoided 1. Select the area to be bypassed on the map. 2. Press the button on the Controller. 3. Press the Co

    © 2019-2024 Copyright www.bmw3g20.com