Power Supply: Introduction

The power supply on the BMW 5- and 6-Series is similar to that on the E65. However, the 5- and 6-Series do not have the power module from the E65. A network of hardware and software assumes the role of energy management. The energy management system monitors and controls the vehicle's energy requirements, both during a journey and when stationary.

The energy management system comprises the functions of the electric energy management system and the power management functions contained therein.

From 09/2005, the vehicle electrical system has been modified. No byteflight  data bus

This modification means that some control units are discontinued and that some control unit functions are integrated into new control units.

The new body gateway module (KGM) supersedes the safety and gateway module (SGM) previously fitted, the door modules and the micro-power module.

The most important components and functions of the electric energy management system are:

• The intelligent battery sensor (IBS) for continuous measurement of the battery's values.
• The software of the power management system in the digital engine electronics (DME) or digital diesel electronics and the intelligent battery sensor.
• The terminal 30g relay, which is actuated by the Car Access System (CAS).
• The micro-power module (MPM), which is located between the front and rear power distributors. As from 09/2005, MPM function is integrated into the body-gateway module (KGM)

Advantages for the power supply are:

• Precise identification of the battery charge state (SoC: "State of Charge") and battery condition (SoH: "State of Health") by the power management.
• IBS designed for use with different assembly groups.
• Reduced off-load current: the consumers on terminal 30g are switched off in a defined manner by the terminal 30g relay.
• A defined connection between the aluminum front end and the steel bodywork with the GRAV earth point in the engine compartment.

  The GRAV earth point improves the vehicle's electromagnetic compatibility (EMC).

• Greater headroom in the rear seat area. The routing of the battery cables in the outer area allows the seats and carpets in the rear of the vehicle to be installed with reduced height.