Self Study Program 668 – Audi A8 (type 4N) driver assistance systems

Self Study Program 668 – Audi A8 (type 4N) driver assistance systems PDF. Once again, the time has come to replace the flagship model of Audi AG. The successful 4th generation of the Audi A8 (type 4H) is
nearing the end of its production run and is making way for its innovative successor: the 5th generation Audi A8 (type 4N).

When it comes to the Audi A8, each model change marks the premiere of innovative solutions and new automotive systems. Each new Audi A8 model broadens the spectrum of driver assistance systems and extends the range of situations in which drivers of this luxury saloon are assisted by cutting-edge technology.

The 5th generation of the Audi A8 includes new features such as intersection assist – a system that assists drivers in impaired visibility situations such as at intersections and obscured exits. The system helps the driver to avoid collisions with cross-traffic ahead of the vehicle by issuing several different types of warning.

Adaptive cruise assist is also featured for the first time in the Audi A8 (type 4N). It assists the driver by providing longitudinal and lateral control assistance over a continuous speed range from 0 to 250 kph. This system combines several driver assistance systems featured previously in other Audi models.

As regards sensors for driver assistance systems, the new laser scanner is also worth mentioning in the introduction.

It is located at the front end of the vehicle and enhances the performance of existing systems by precisely surveying the area in front of the vehicle. New driver assistance systems would not be possible without it.

A new trend can also be observed in terms of how the control units of the driver assistance systems are structured. The Audi A8 (type 4N) utilises, for the first time at Audi, a central driver assistance systems control unit which acts as the master control unit for multiple assistance systems. Its service designation is driver assistance systems control unit J1121. The new control unit replaces several well-known control units, whose functions are now integrated into control unit J1121.

Several sensors are connected directly to driver assistance systems control unit J1121 but no longer utilise an in-car bus system. The sensor data is processed in control unit J1121. This applies to the
front camera for driver assistance systems and the four surround view cameras. In turn, control unit J1121 receives data from the other sensors via the FlexRay bus.

The fact that all sensor data is now available in a single control unit means it is possible to supply functions with high-quality data on the area around the vehicle. This, in turn, is the basis for further
improvements in the performance of the various driver assistance systems.


  • New driver assistance systems for longitudinal and lateral control
    • New structure
  • Active lane departure warning
    • Switching on and off
    • Displays
    • Master control unit
  • Adaptive cruise assist
    • Introduction
    • Displays and operation
  • Longitudinal control
    • Overview
    • Predictive efficiency assist
  • Lateral control
    • New features of the vehicle’s lateral control function
    • Functional configuration and sensors required
    • Control units affiliated to adaptive cruise assist
  • Emergency assist
    • Function
    • Time sequence of active emergency assist processes
    • Time sequences of emergency assist processes during vehicle operation without assist systems activated
    • Time sequence of emergency assist processes when driving with adaptive cruise assist
  • Parking systems
    • Parking system plus
    • Park assist
    • Reversing camera
    • 3rd generation surround view cameras
  • Profile master for driver assistance systems
    • Structure
    • Operating concept
    • System configuration
  • 2nd generation matrix LED main beam assist
    • Operating the system and setting options
    • Additional functions
    • System networking
  • 3rd generation camera-based traffic sign recognition system
    • Redesigned speed warning
    • No entry warning
    • New features in the US and Canadian markets
    • Overview of selected traffic signs
  • Rear radar based driver assistance systems
    • New features of side assist
    • Turn-off assist function of side assist
    • Use of turn-off assist in further traffic scenarios
    • New features of the exit warning system
    • New features of cross-traffic assist
  • Intersection assist
    • Functional description
    • Intersection assist sensors
    • Warnings of intersection assist
    • System networking
  • Driver assistance systems control unit J1121
    • Control unit versions
    • Installation location of the control unit
    • The driver assistance systems control unit J1121 and its sensors
    • Driver assistance systems control unit J1121 – Version A0
    • Driver assistance systems control unit J1121 – Version A
    • Driver assistance systems control unit J1121 – Version B
    • Driver assistance systems control unit J1121 – Version C
  • Control unit for laser distance control J1122 (laser scanner)
    • Design and function
    • Service operations
  • ACC control unit J428
    • Design and function
    • Operation and driver information
    • Service operations
  • Appendix
    • Test your knowledge
    • Self study programmes

The Self Study Programme teaches a basic understanding 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 about maintenance and repair work, always refer to the current technical literature.

Language: English
Format: PDF
Pages: 84

Self Study Program 668 – Audi A8 (type 4N) driver assistance systems

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