Self Study Program 434 – The Audi Headlight Assist System

VAG SSP 434. With the Headlight Assist System, AUDI has added a new highlight to its range of driver assist systems. The system enhances ride comfort in the dark by automatically switching the main-beam headlights on or off depending on the momentary traffic situation. Thus, it provides improved visibility while driving at night.

Surveys have shown that many drivers forgo switching on their main-beam headlights at night, even though this would greatly improve visibility, and therefore safety, during night-time driving. Respondents cited, as reasons, that under no circumstances do they want to dazzle oncoming traffic, or that they are familiar with the route and therefore do not feel the need to use the main-beam headlights, or that they cannot be bothered switching the main-beam headlights on and off all the time due to heavy oncoming traffic.

However, the visibility of objects is greatly reduced while driving with the headlights dipped, as opposed to driving with the headlights on main beam. When driving with the headlights on main beam, objects can often be detected well enough in advance for the driver to stop in time or take evasive action.

The Headlight Assist System maximises the “on” time of the main-beam headlights in the dark, and only dims down when the ambient and traffic conditions necessitate. The main-beam headlights are dipped before they can dazzle another road user. The driver has all the advantages of better-illuminated surroundings, without having to constantly switch the main-beam headlights on and off by himself.


  • Function description
    • The function of the Headlight Assist System
    • On and off conditions
  • Mode of operation of the Headlight Assist System
    • Introduction
    • An oncoming vehicle
    • A vehicle ahead
    • Driving through a built-up area
    • A built-up area at a distance from the road
    • A single house by the roadside
  • System operation and displays
    • System operation
    • The operating logic of the Headlight Assist System
    • Displays in the dash panel insert
  • Functional implementation in the vehicle
    • Component parts of the Headlight Assist System
    • The electrical interface of the rear-view mirror
    • The distributed “Headlight Assist” function
    • Communication structure
  • Diagnostics
    • Diagnostics in the Headlight Assist control unit J844
    • Diagnostics in the onboard power supply control unit J519

The Self-Study Programme teaches the design and function of new vehicle models, new automotive components or new technologies.
The Self-Study Programme is not a Repair Manual.
The values given are for illustration purposes only and refer to the software version valid at the time of preparation of the SSP.
For information about maintenance and repair work, always refer to the current technical literature.

Language: English
Format: PDF
Pages: 24

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