BMW 5 Series Owners & Service Manuals

BMW 5 Series: Power distribution box, front right

Components
Power distribution box, front right

A relay for terminal 30B is installed in the front right power distribution box.

Consumers are supplied with terminal 30, terminal 30B and terminal 15N and provided with corresponding fuse protection by the front right power distribution box. Terminal 15N is supplied from the front power distribution box by the rear power distribution box.

Power distribution box, front left (PHEV Version only)

Components
Power distribution box, front left

A relay for terminal 30B is installed in the front left power distribution box.

Consumers are supplied with terminal 30 and terminal 30B and provided with corresponding fuse protection by the front left power distribution box.

Power distribution box, rear

Components
Power distribution box, rear

The following relays are installed in the rear power distribution box:

  • 2 Relay's, terminal 30F
  • 2 Relay's, terminal 30B
  • Relay, terminal 15N
  • Relay for rear window heating

All relays are bi-stable relays. The relays area activated by the Body Domain Controller via LIN. The hard-wired terminal 30B relays of the two front power distribution boxes are activated via the rear power distribution box.

Body Domain Controller

The Body Domain Controller (BDC) is responsible for the terminal control.

A terminal 30F relay is installed in the BDC.

A number of consumers are supplied with terminal 30 and terminal 30F and provided with corresponding fuse protection via the BDC.

PCU with vehicle electrical system assistance measure

Modern vehicles have a high energy consumption due to the many electrical consumers. As a result, there is a high demand on the battery particularly in phases in which the combustion engine is not running and the alternator supplies no energy (e.g. engine start/stop phases).

In order to protect the vehicle battery, a DC/DC converter is installed in the Power Control Unit (PCU) and an auxiliary battery in the engine compartment in the G30.

The preconditions for the direction of the energy management are calculated from the use of the vehicle. When the engine is running the auxiliary battery is charged from the conventional vehicle electrical system. During the phases in which the combustion engine is not running, e.g. automatic start/stop function, the energy is supplied from the auxiliary battery into the conventional vehicle electrical system.

The Power Control Unit PCU contains a control unit which is connected to the PT-CAN2 and a DC/DC converter with a power of 500 W.

On vehicles with the equipment electric active roll stabilization, this is supplied by the auxiliary battery in the engine compartment.

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