Audi A4

since 1994 release

Repair and operation of the car



A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
- Electrotechnical equipment
   Minus is connected to weight
   The help for orientation in the electrotechnical equipment of the car
   Wires
   Connections of wires
   Central switching knot
   Support of additional relays
   Box for electronics
   Relay and control units
   Switching relay
   H-contact of the relay of unloading
   Table of the relay and control units
   Safety locks
   Table of safety locks
   + Electric circuits
   + Accumulator
   + Generator
   + Starter
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics





The help for orientation in the electrotechnical equipment of the car

Here lateral facing (2) in the driver's feet is unscrewed. Shooters showed fixing screws. Under it there is a group of sockets (1).


Under lateral facing (1) from the passenger near the driver too there is a group of sockets (2). Shooters showed fixing screws.

On the right: the central switching hub (2) is in Audi A4 under a control panel at the left. Above "the 13-seater support of additional relays" is placed (1).

At the left: in drawing placement of nests of the central switching knot is shown.

Standard designations of plugs

Multi-colored mixture of wires in the car is actually very well ordered as many details of the electrotechnical equipment of the car are standardized. Figures on different knots and connecting elements of wires, and also in electric circuits on all German and on some foreign cars have the same value:

The plug 15 receives power supply only at the included ignition from the ignition lock, thus along with system of ignition/injection those consumers of the electric power who have to receive current only during operation of the car are supplied with current. At wires to plugs 15 in most cases a cover of black color, sometimes with a color additional strip at certain consumers of current.

The plug 30 receives a direct current from plus of the accumulator or from the generator at the working engine. At careless handling of tools it can lead to short circuits or cause a rain of sparks if the wire connected to accumulator minus is not removed. These wires which are always energized in most cases have red color, sometimes with additional color strips.

The plug 49 belongs to system of faltering and emergency light signals.

Via the plug 53 tension in system of clarification of glasses moves.

From the plug 56 current on headlights of a passing beam on yellow and yellow-black wires, and also on headlights of a driving beam on white and white-black wires moves.

From the plug 58 the electric power on forward parking fires, and also on back lamps and for illumination of registration plate moves. Primary color of a cover of wires gray, sometimes with an additional color strip.

The plug 75 of the lock of ignition receives current in case the ignition key is in situation "Is included".

The plug 31 – the plug of weight by means of which the consumer of the electric power has to be connected to weight to close an electric chain. At the corresponding wires a cover of brown color.

The designated electric sockets

In Audi A4 often separate wires are connected in the whole sheaves in a black cover that complicates search of a separate certain wire. In this case the help in orientation mnogoshtyrkovy connections on which in this chapter the exact quantity of wires and their exact arrangement in electric circuits is described are provided.