BMW 3 Owners & Service Manuals

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.

Connections

The following simplified wiring diagram shows the high-voltage connections between the Electrical Machine Electronics and the other high-voltage components.

Connections
High-voltage connections of the Electrical Machine Electronics

  1. Electrical heating
  2. Electric motor
  3. High-voltage battery unit
  4. 12 V battery
  5. Charging socket
  6. Electric A/C compressor
  7. Unidirectional AC/DC converter
  8. Convenience charging electronics
  9. Electrical Machine Electronics
  10. Bidirectional DC/AC converter
  11. Unidirectional DC/DC converter
  12. Anti-overload current guard (90 A)

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