Self Study Program 634 – Audi Q7 (type 4M) Onboard power supply and networking

VAG SSP 634.The first part of this self study programme summarises the onboard power supply of the Audi Q7 and provides information on the functions, installation locations and specific features of numerous control units.

It is particularly worth mentioning the rising number of driver assist systems, innovative light technology and, of course, the rapid development in the infotainment sector. Without that development, many in-car comforts and conveniences that are now taken for granted would not have been achievable.

The number of electronic control units has grown rapidly in recent years. Most of today’s innovations have only been made possible by the increasingly higher performance of the electronic systems.

When the Audi Q7 (type 4M) is compared with its predecessor, the Audi Q7 (type 4L), there are the following striking differences:

  • The number of control units has increased from about 60 to 120.
  • The number of control units which use the bus systems has risen sharply, particularly the number of LIN control units.
  • In-car data transfer rates have quadrupled.

The Audi A3 (type 8V) and TT (type FV) models are representatives of the so-called MQB (Modular Transverse Platform). The Audi A6, A7 and A8 belong to the MLB (Modular Longitudinal Platform). The structure of the onboard power supply within a platform is, apart from equipment-related differences, always the same. The Audi Q7 (type 4M) is the first representative of the MLBevo (Modular Longitudinal Platform Evolution). Its new onboard power supply structure therefore replaces that of the MLB.

The design and function of the various headlight and tail light versions are described in “Exterior  lighting”. This is a quick and direct way to obtain an in-depth knowledge of the electrical and electronic equipment in the Audi Q7.

Learning objectives of this self study programme:

Once you have completed this self study programme you will be able to answer the following questions:

  • Where are the fuseholders located in the Audi Q7 and what are their designations?
  • In what locations are electrical components fitted on the car?
  • Which bus systems are used on the Audi Q7?
  • What are the tasks of the control units in the car?
  • What are the versions of the exterior lighting and how are the individual light functions implemented?
  • What changes have been made regarding headlight range adjustment and calibration of the Audi Matrix LED headlights?


  • Voltage supply
    • Car battery
    • Jump start terminal
    • Supply structure
    • Fuses and relays
  • Network system
    • Installation locations of control units
    • Topology
    • Bus systems used on the Audi Q7
    • FlexRay
    • Optical data bus system MOST150
  • Control units
    • Brief descriptions
  • Exterior lights
    • Headlight variants
    • Xenon headlight
    • LED headlights
    • Audi Matrix LED headlight
    • Tail lights
    • Sequential flashing
    • High-level brake light / number plate lights
  • Start-stop system
    • Start-stop system version 2.0
  • Audi drive select
    • Functional characteristics
    • Displays and operation
    • Driving modes
    • Controllable systems
    • Audi drive select function
  • Appendix
    • Self study programmes

The Self Study Programme teaches a basic knowledge of the design and mode of operation of new models, new automotive components or new technologies.
It is not a Repair Manual! Figures are given for explanatory purposes only and refer to the data valid at the time of preparation of the SSP. This content is not updated.
For further information on maintenance and repair work, always refer to the current technical literature.

Language: English
Format: PDF
Pages: 72

Self Study Program 634 – Audi Q7 (type 4M) Onboard power supply and networking PDF free online