Self Study Program 620 – Audi ACC Systems

VAG SSP 620. This self study programme serves as an update to the existing SSP 289. It also provides an overview of the ACC systems used in current Audi models. Another key topic is the additional functions complementing the ACC basic function. In the area of service, special attention is given to the procedure for setting the current ACC systems with two radar sensors.

Recent years have been characterised by rapid development in the field of driver assist systems. This has been made possible by technological progress, specifically in the development and production of electronic components.

The complexity of available functions is also growing due to the shared use of subfunctions by various vehicle systems, as well as by increasing information exchange between vehicle systems. It is predicted that piloted driving will become a technical reality even during this decade. Adaptive Cruise Control (ACC) is one of the basic systems which laid the foundation for this development when it was first introduced on the Audi A8 in 2003. In the course of this evolutionary process, the range of functions of the ACC system has steadily grown and this system is today used in many current Audi models.

Understanding the functional relationships between systems is a major challenge for service personnel. This knowledge is indispensable when it comes to explaining to customers how systems work and performing function tests as well as identifying, diagnosing and, ultimately, correcting faults.

A self study program (SSP 289) was previously published when the ACC system was introduced on the Audi A8 in 2003. The range of functions of ACC has since been significantly extended by, in particular, including measured data provided by other sensors. Further system improvements have extended the system’s limits and greatly increased system availability.


  • ACC basic function
    • Overview
    • Technische implementation – radar technology
    • The distance measurement process
    • Determining the speed of the vehicle ahead
    • Example showing how the speed and distance of the vehicle ahead are determined
    • Determining the position of the vehicle ahead
    • Determining the vehicle relevant to ACC
    • Adaptive Cruise Control (ACC) – system limitations
  • Description of ACC system
    • ACC options
    • System parameters
    • System components
    • Networking – data transfer
  • Operation and driver information
    • ACC on/off
    • Setting the target speed
    • Setting the target distance
    • Setting the drive program
    • Setting the gong volume
    • System status indication
    • How the driver is prompted to take over
    • Basic operation
  • ACC auxiliary functions
    • Overview
    • Audi braking guard
    • Evolution
    • Audi Stop and go
    • Lane change assistance
  • Service operations
    • Sensor vision
    • Replacement and removal/installation of the ACC sender with ACC control unit
    • Calibrating the ACC sender

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: 44

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