Audi 80/Avant (B4)

Audi 80/Avant
The description
System of release of the fulfilled gases
Cooling system
Fuel tank and the fuel pump
The air filter and intake channels
Injection system
Transmission and transmission
Suspension bracket and steering
Brake system
Antiblocking system of brakes
Wheels and tyres
- body electrosystem
   Minus to "weight"
   Orientation in electrosystem
   Plug connections
   The central switchboard
   The additional block of the relay
   The relay and management blocks
   The unloading relay of contact Х
   Safety locks
   The table of safety locks
   Electric schemes
    The full electroscheme of car Audi 80: the 2-litre 4-cylinder engine (66 kw)
    The 2-litre 4-cylinder engine (85 kw)
    The 2,3-litre 5-cylinder engine (98 kw)
    The 2,6-litre 6-cylinder engine (110кВт)
    Additional equipment
    The storage battery
    The generator
   Condition check wedge or wedge a belt
   Tension wedge a belt
   Tension wedge or semi wedge a belt
   Torn wedge a belt
   Overheat of the engine because of damage wedge a belt
   The review wedge and semi wedge belts
   Replacement wedge a belt
   The list of malfunctions
   The list of malfunctions
Ignition system
Signalling devices
Devices and auxiliary devices
Heating and ventilation
Body elements
Search of malfunctions

The central switchboard

The central switchboard is located in car Audi 80 in a water-proof casing under a windscreen. In it can be to 31 safety locks (on one more, if the car with the diesel engine), four reserve safety locks and in total eleven relays. Besides, in the same place it is located штекерное connection for connection of the diagnostic device.

1 – the relay for antifog headlights and back dimensional fires, the bridge if the car is not equipped by antifog headlights;
2 – the relay of the fan of system of cooling (the models which have been not equipped with the conditioner), the relay for the second fan of system of cooling;
3 – the block of management of inclusion of the fan after engine cessation of work;

4 – the block of management of system of clearing of headlights;
5 – the unloading relay of H-contact.

6 – the fan relay (on models with the manual conditioner), the relay of the second fan of system of cooling (on models with the automatic conditioner and some variants of the engine);
7 – the relay of a sound signal;
8 – the relay of system of the alarm system (on models with mechanical КП), the bridge on the models which have been not equipped with system of the alarm system. On the models equipped АКП, this place remains empty;

9 – the relay of a faltering mode of system of a screen wiper/washing of glasses;
10 – the relay of the fuel pump;
11 – the relay of the first fan of system of cooling.

All wires in Audi 80 are collected in various plaits. All of them come to an end in the so-called central switchboard, black ящичке, located at the left behind in a motor compartment in a water-proof casing. There it is possible to place 21 safety lock, ten additional safety locks, four reserve safety locks and relay variety.

Replacement of the central switchboard

If by search of malfunctions it was found out that подводка the cables, corresponding the safety lock or the relay have no damages a cause of defect can be and the central switchboard. Leaky contacts or the refusals connected with temperature can be typical damages. In this case it is necessary to replace the central switchboard.


  1. As a spare detail it is necessary to get necessarily corresponding version of the central switchboard.
  2. To open a cover and to disconnect loops.
  3. To press on fixing скобы on the right and at the left on a plug-in element – actually central the switchboard and to pull out a plug-in element with the connected wires.
  4. To switch tips one after another with old to the new device.
  5. Again to establish a plug-in element in a framework.
  6. To remove a shelf at the left under the instrument panel and to check, whether all wires have been switched.

 The help: the cover of the central switchboard should be closed, differently during driving on feet of the driver draughts will walk.