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.

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)

    READ NEXT:

     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

    SEE MORE:

     Roof-mounted luggage rack

    General information Roof racks are available as special accessories. Roof drip rail with flaps The fixing points are located in the roof drip rail above the doors. Fold the cover outward. Mounting Follow the installation instructions of the roof rack. Be sure that adequate clearance is maintained

     Monitoring functions

    High-voltage interlock loop The SME control unit evaluates the signal of the high-voltage interlock loop and checks whether there is an open circuit with this circuit. In the event of an open circuit, the battery management electronics control unit can cause the high-voltage system to perform a qu

    © 2019-2025 Copyright www.bmw3g20.com