Audi A4

Since 1994 of release

Repair and car operation

Audi А4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The alarm equipment
- Tools and devices
   Check of control tools and bulbs
   The combined device
   The indicator of quantity of fuel
   The indicator of temperature of a cooling liquid
   Auxiliary devices
   Control bulbs above in the combined device
   Control bulb of a cooling liquid
   Control bulb of level of a brake liquid
   Control bulb of pressure of oil
   Control bulb of indexes of turns
   Control bulbs in devices of the round form (and nearby)
   Control bulb of indexes of turn on the trailer
   Control bulb ASR
   Control bulb of the lock of ignition
   Control bulb of headlights of a headlight
   Control bulb of a pillow of safety
   Control bulb ABS
   Control bulb of a lay brake
   Control bulb of gymnastics of the accumulator
   System of the autocontrol of the car
   The ignition lock
   Check of switches
   Alarm buzzer of illumination
   Cigar Lighter
   Warmed back glass
   Check of screen wipers and windscreen
   The engine of screen wipers
   The help at malfunctions
   Gulf of a liquid for washing of glasses
   System of washing of headlights
   Adjustment of a mirror with the electric drive
   The central lock
   window raiser with the electric drive
   Sliding/demountable roof with the electric drive
   Radio receiver
   The aerial on back glass
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics

Warmed back glass

The bared right rack of a roof

1 – aerial connection;
2 – connection of back warmed glass;
3 – an aerial wire to a radio receiver;

4 – an operating line from a radio receiver;
5 – the aerial amplifier;
6 – a wire from the switch of warmed glass.

The point of weight (arrow) of warmed back glass and the aerial is in back glass on the right back rack of a roof. It is accessible after dismantle of facing of a rack of a roof.

Heating of back glass joins and switched off directly by means of the switch on a control panel. The current at the included ignition arrives to the switch from the relay of unloading of H-contact through a safety lock in a white/yellow wire. The electronic scheme of inclusion with the timer which is integrated into the switch of warmed back glass, disconnects current giving to glass approximately in 10 minutes

Search of malfunctions

If warmed back glass remains cold, following possibilities are considered:


  1. Defective safety lock.
  2. The defective switch. Dismantle (as it is described in this chapter) and check up an electric control lamp, whether there is a pressure in a white wire at the included ignition and the pressed switch.
  3. Dismantle both coverings of a rack of a roof near to back glass. It is easier to make it after dismantle of a reception pocket in a back part of the car and lateral facing of a seat.
  4. Check up bringing wire to back glass: by means of a control lamp establish, whether there is a pressure behind in a white submitting wire at the left on glass. (It also concerns cars with the aerial in back glass.)
  5. On the right rack of a roof check up, whether contact of glass to weight is perfectly in order.
  6. The damaged threads of heating can be repaired a current-carrying silver varnish which is on sale in shops of the accompanying goods.

 Council: Three current-carrying paths above on warmed back glass concern the aerial and consequently do not heat up.