Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car

Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ System of injection
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
- Body electrical system
   Minus to "weight"
   Orientation in the electrical system
   Plug connections
   Central switchboard
   Additional block of the relay
   Relay and control units
   Unloading relay of contact of X
   Safety locks
   Table of safety locks
   Electric circuits
   + Full electroscheme of the Audi 80 car: 2-liter 4-cylinder engine (66 kW)
   + 2-liter 4-cylinder engine (85 kW)
   + 2,3-liter 5-cylinder engine (98 kW)
   + 2,6-liter 6-cylinder engine (110kvt)
   + Additional equipment
   + Battery
   + Generator
   Check of a condition of a maple or polilinovy belt
   Tension of a maple belt
   Tension of a maple or poliklinovy belt
   The belt torn maple
   Engine overheat because of damage of a maple belt
   Review of maple and poliklinovy belts
   Replacement of a maple belt
   List of malfunctions
   List of malfunctions
+ System of ignition
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Safety locks

Each electric device in the car needs a certain assigned amount of current. According to this current also the cross section of the wire conducting to the device is defined.

If in this electric chain current, for example, because of appearance of additional consumers or because of short circuit raises, this wire is overloaded. Thus it can heat up slightly or even to start being heated if in due time not to interrupt receipt of current. It is also done by safety locks. As it was already noted in order that the Audi car at defect in an electrochain did not appear completely without food, safety locks are distributed in various electrochains. However connections between the accumulator, the generator, a starter and the lock of ignition are not protected by safety locks.

Replacement of safety locks


  1. If it is necessary to replace one of safety locks, you can use the small plastic nippers strengthened on a cover of the central distributing device for a detachment.
  2. If the new safety lock again fuses at once, it is necessary to check, whether too weak safety lock was established.
  3. If the safety lock was picked up truly, it is necessary to reveal on the basis of the table of safety locks the connected consumers of current and to check each of them separately. Thus the corresponding electroscheme will also help.
  4. In a doubtful case it is necessary to disconnect everything consumers and to connect them one by one on the single. The consumer at which connection the safety lock fuses, is faulty.

Additional safety locks

On certain versions with the additional equipment on the additional block of the central switchboard additional safety locks are located. Is what in the table of safety locks are specified at numbers 23 – 28.

Number 22 is necessary on cars with the diesel engine. Also on this panel at some versions safety locks for system of ignition and injection are located. The red cover with an inscription of "Motor-Moteur" serves thus as protection.