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Advance by technology The new Audi A4, a vehicle which combines driving pleasure and good sense with the highest level of quality and sports styling. Control unit for vehicle electrical system 48 New engine programme 18 Electronic stability programme with brake assistance 32 Steering column switch module 44 Crash sensors for front airbag 14 Multi communication bar 72 Trapezium link rear axle 27 Aero floor 7 2 Contents Page Introduction 4 Body 8 Occupant protection 12 Engine and gearbox 2.0 l R4 and 3.0 l V6 engines see SSP 255 . 18 Innovations 2.5 l V6 TDI engine 19 Innovations automatic gearbox . 23 Running gear Axles 26 Mechanical unit mountings . 28 Brake system . 29 Brake assistance 32 Electrical system Vehicle electrical system 36 CAN BUS system 38 Dash panel insert 40 Steering column switch module ..44 Function circuit diagram . 46 Control unit for vehicle electrical system 48 Function circuit diagram for lowline version . 50 Function circuit diagram for highline version 52 Convenience system . 58 Anti theft alarm system . 63 Radio chorus II, concert II and symphony II . 65 Navigation IV and Navigation Plus D 69 Multi communication bar . 72 Electric logbook Audi Logbook . 74 Heater/AC Design and function . 76 7 piston compressor . 77 Air conditioner 78 Glove compartment cooling . 79 Solar roof . 80 Fresh air blower . 81 Actuators/sensors . 82 Functional diagram for fully automatic air conditioner 84 Additional heater 86 New Important Note The self study programme will provide you with information on design and functions. It is not intended as a workshop manual. For maintenance and repair operations it is essential that you refer to the current technical literature. 3 Introduction The architecture of motion Performance and smooth running The engine programme of the new Audi A4 includes two petrol engines of a complet