BMW E65 User Manual download pdf (Page 49)

E65 Bus Systems

Diagnosis bus

Introduction

The aim of diagnosis is to enable a Technician to reliably identify a defective component. By

the use of appropriate hardware and monitoring software, the microprocessor of a control

unit, for example, is able to detect faults in the control unit and its peripherals.

Faults identified are stored in the fault memory and can be read out using the Diagnosis

Program. Data transfer between the vehicle and the diagnosis tool takes place via the

Diagnosis bus (D bus). The new features of the diagnosis bus are:

• Faster data transmission speed of 115 kBd.

• Central diagnosis access point (OBD connector).

• Single diagnostic cable (TxD II) for the entire vehicle.

• Omission of the TxD1 cable.

• Access to diagnosis functions requires “Authorization”.

• Diagnosis protocol "KWP 2000" (Keyword Protocol 2000).

• Standardized diagnosis structure for all control units.

KT-8713

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BMW E65 User Manual Page 49