Self Study Program 293 – AUDI A8 2003 – Infotainment

VAG SSP 293. This Self Study Programme contains information on the infotainment system and the associated  distributed functions in the Audi A8 2003. This introduction contains explanatory notes to clarify the meanings of certain terms, designations and symbols used in this Self Study Programme.

An understanding of the interaction of the components and distributed functions forms the necessary basis for successful fault-finding.

More detailed information can be found in the following Self Study Programmes:

Definition of terms

Data bus network (topology)

The topology provides a general outline of the way in which control units fitted in the vehicle are  interlinked by way of data bus systems. It thus becomes clear which bus systems are used by the control units to exchange data.

Distributed functions

This term indicates that several control units are required to exchange information in order to implement a function.

Function master

With distributed functions, one control unit is always responsible for the entire sequence of operations. The function master control unit gathers all input information. The requests resulting from this are then transmitted in the form of a message on the data bus system and read into the control units concerned for corresponding actuation of the appropriate connected components.

Substitute master

In the event of function master failure affecting major functions, the task of the function master is  assumed by a control unit provided for this purpose and designed to maintain the sequence of operations (possibly with certain restrictions).


Ignition switched on by way of electric ignition/starter switch or Advanced Key, so that entry and start authorisation control unit J518 transmits terminal 15 and 75x information to convenience CAN. The intermittent wiper switch E22 transmits the information “Wiper speed 1” to the steering column  electronics control unit J527.

  1. The steering column electronics transmits the information “Wiper speed 1” to the  onboard power supply control unit J519.
  2.  The onboard power supply control unit transmits the information “Wiper speed 1” via the LIN to the wiper motor control unit J400.
  3. The wiper motor control unit actuates the integrated motor.


  • Introduction
  • Infotainment
    • System layout of CAR functions
    • Infotainment system layout
    • Multimedia interface (MMI)
    • Front information display and operating unit control unit J523
    • Front information and display and operating unit control unit J685
    • Multimedia operating unit E380
    • Multi-function steering wheel and display in dash panel insert
  • Sound System
    • Introduction
    • Digital Bose Surround sound system
  • Radio Module
    • Radio module R
    • Dialog system
  • Navigation
  • Telephone/Telematics

The Self Study Programme contains information on design features and functions.

The Self Study Programme is not intended as a Workshop Manual.
Values given are only intended to help explain the subject matter and relate to the software version applicable when the SSP was compiled.

Use should always be made of the latest technical publications when performing maintenance and repair work.

Language: English
Format: PDF
Pages: 72

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