BMW E65 User Manual download pdf (Page 16)

E65 Bus Systems

Controller Area Network (CAN Bus)

Introduction

The CAN bus is a serial communications bus in which all connected control units can send

as well as receive information. Data exchanges over a CAN operate at a rate of 100 to

500Kbps.

The CAN protocol was originally developed by Robert Bosch GMbH and the Intel corpora-

tion in 1988 for use in the automotive electronics industry to provide a standardized, reli-

able and cost-effective communications bus.

The CAN bus was originally introduced on BMW automobiles in 1992 740i/iL as a data link

between the DME and AGS control units.

E65 K-CAN

Introduction

For the E65, the functions that were incorporated within the main bodyshell electrical sys-

tem on the E38 have been distributed among a number of separate control units. Those

control units and various new control units are connected to the K-CAN.

The K-CAN is a new development and is subdivided into two sections, the K-CAN System

and the K-CAN Peripherals.

Examples of new control units and functions on the K-CAN are the Car Access System

(CAS), the Centre Console Control Center module (BZM), the Rear Centre Console Control

Center module (BZMF) and the Power Module (PM).

K-CAN System/Peripherals

The subdivision of the K-CAN into the sections "SYSTEM" and "PERIPHERALS" relieves

the load on the bus because the number of vehicle components (control units/modules) is

divided between two "independent" bus systems.

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BMW E65 User Manual Page 16