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
+ System of ignition
+ Lighting
+ Signalling devices
- Devices and auxiliary devices
   Check of indicators and signaling devices
   Elements of a combination of devices
   Indicator of amount of fuel
   Indicator of temperature of cooling liquid
   Voltage stabilizer
   Additional devices
   The top indicators in a combination of devices
   Indicator of cooling liquid
   Indicator of brake system
   Oil pressure indicator
   Indicators of indexes of turns
   Lower indicators
   Battery charge indicator
   Indicator of indexes of turn of the trailer
   Safety cushion indicator
   Indicator of anti-blocking system
   Indicator of a driving beam
   Indicator of the parking brake
   System of self-examination
   Ignition lock
   Check of switches
   Buzzer of shutdown of lighting and radio
   Heating of back glass
   Check of screen wipers and windscreen washers
   Screen wiper engine
   List of malfunctions
   Screen wiper of back glass
   List of malfunctions
   Replenishment of a washer reservoir of glasses
   System of washing of headlights
   Audio system
   Antenna of back glass
   Electric regulation of external rear-view mirrors
   System of locks with the central management
   Power windows
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Heating of back glass

Heating of back glass joins and switched off directly by the switch located on the dashboard. Food to the switch arrives at the included ignition from the unloading relay of H-contact through a safety lock on white yellow wire. From there at the relevant provision of the switch food goes to back glass through numerous plug connections in a white wire.

Search of malfunctions

If the warmed back glass remains cold, the following malfunctions can be the cause of it:


  1. Faulty safety lock.
  2. Faulty switch. It should be removed (the way described in this chapter) and to check by means of a control lamp, whether passes on a white wire current at the included ignition and the pressed switch.
  3. To remove both coverings of racks near back glass.
  4. To check conducting to back glass: to check by means of a control bulb, whether food on a white connecting wire to glass reaches at the left back. (In the same way it is necessary to operate and on the models equipped with the antenna of back glass).
  5. To check on the right rack, whether as it should be contact on "mass" of a thread of heating flew down.
  6. If heating threads are damaged and by that the electric chain is broken off, it is possible to use a silver conducting varnish. It is made, for example, by Doduco firm, and it is possible to get it in shop of auto parts.