BMW 3 Owners & Service Manuals

BMW 3: 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

  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)


     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



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