Power supply : E81, E82, E87, E88, E90, E91, E92, E93: Introduction

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 135i, and 2010 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

A network of hardware and software guarantees the power supply for vehicle systems. Two software functions are of fundamental importance for the power supply:

Energy management
Power management

The energy management system ensures that sufficient starting power is always available.

The energy management system monitors the vehicle even when the engine is not running.

The energy management system comprises all vehicle components that generate, store and consume energy.

The data for the energy management system are divided among several control units.

The power management system is a subsystem of the energy management system. Power management is controlled by the engine control unit (DME or DDE: digital engine electronics or digital diesel electronics).

While the vehicle is being driven, the power management system regulates the output of the alternator and the battery charge.

System overview: control units on terminal...

E87, E90, E91 up to 09/2005
E87, E90, E91, E92 from 09/2005 until 03/2007
E81, E87, E90, E91, E92, E93 from 03/2007 until 09/2007

E81, E82, E87, E88, E90, E91, E92, E93 from 09/2007