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Service System description adaptive cruise control Edition 10.2011 Service Department. Technical Information Service List of Workshop Manual Repair Groups Repair Group 01 Self diagnosis, electrical checks Technical information should always be available to the foremen and mechanics, because their careful and constant adherence to the instructions is essential to ensure vehicle road worthiness and safety. In addition, the normal basic safety precautions for working on motor vehicles must, as a matter of course, be observed. A005A400920 Audi A4 2008 ➤ , Audi A5 Cabriolet 2009 ➤ , Audi A5 Coupé 2008 ➤ System description adaptive cruise control Edition 10.2011 Contents 01 Self diagnosis, electrical checks 1 1 General notes on „adaptive cruise control“ ACC 1 1.1 Technical data 2 1.2 Components used 2 1.3 General notes on information exchange 4 1.4 Definition of terms and abbreviations 5 2 Function No vehicle in front, cruise control 7 2.1 General notes, components used 7 2.2 Description 7 2.3 Notes for service 7 3 Function Vehicle in front 8 3.1 General notes, components used 8 3.2 Description 9 3.3 Notes for service 10 Contents i Audi A4 2008 ➤ , Audi A5 Cabriolet 2009 ➤ , Audi A5 Coupé 2008 ➤ System description adaptive cruise control Edition 10.2011 ii Contents Audi A4 2008 ➤ , Audi A5 Cabriolet 2009 ➤ , Audi A5 Coupé 2008 ➤ System description adaptive cruise control Edition 10.2011 01 Self diagnosis, electrical checks 1 General notes on „adaptive cruise control“ ACC Requirements for adaptive cruise control The following information is required for the control Distance to vehicle in front The time span between the transmission of the signal and the receipt of the reflected signal components depends on the dis‐ tance to the object. In other words, the further away an object or vehicle is, the longer it takes to receive the signal echo. Speed of vehicle in front If the dist