Audi A4

since 1994 of release

Repair and car operation



A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
+ injection System
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
- Electrotechnical equipment
   The 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
+ ignition System
+ 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 feet of the driver 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 at the left under a control panel. «The 13-seater support of additional relays» (1) above is placed.

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 actually is 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 should receive a current only during car operation are supplied with a current. At wires to plugs 15 in most cases a cover of black color, sometimes with a color additional strip at certain consumers of a 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 a minus of the accumulator is not removed. These wires being 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 the 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 lay 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 a current in case the ignition key is in situation "Is included".

The plug 31 – the weight plug by means of which the consumer of the electric power should 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.