Self Study Program 286 – New data bus systems – LIN, MOST, Bluetooth

VAG SSP 286. The constantly increasing demand for additional functions and convenience in the vehicle calls for the use of ever more  wide ranging electronics. Whereas the first Audi A8 model introduced in 1994 required a maximum of only 15 control units for implementation of all vehicle functions, this number will increase five-fold in the Audi A8 2003.

The increased use of electronics also required a new approach to data transfer between the individual control units. A first important step towards this was the introduction of the CAN data bus at Audi in the mid 1990s.

This system does however have its limitations, particularly with regard to the transmission rates involved in the infotainment sector. The only solution is therefore to employ transmission systems designed to deal with specific requirements. Service and diagnosis functions will also benefit from this development.


  • Introduction
  • LIN bus – The single-wire data bus
    • Introduction
    • Data transfer
    • Messages
    • Diagnosis
  • MOST bus – The optical data bus
    • Introduction
    • Design of control units
    • Optical fibre
    • Attenuation in optical bus
    • Ring configuration of MOST bus
    • MOST bus system statuses
    • Frames
    • Operating sequences in MOST bus
    • Diagnosis
  • BluetoothTM – The wireless data bus
    • Introduction
    • Operation
    • Diagnosis
  • Diagnosis bus

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: 56

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