Audi A4

since 1994 release

Repair and operation of the car

A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
- Tools and devices
   Check of control tools and bulbs
   The combined device
   Indicator of amount of fuel
   Indicator of temperature of cooling liquid
   Auxiliary devices
   Control bulbs above in the combined device
   Control bulb of cooling liquid
   Control bulb of level of brake fluid
   Control bulb of pressure of oil
   Control bulb of indexes of turns
   Control bulbs in devices of a round form (and nearby)
   Control bulb of indexes of turn on the trailer
   Control bulb of ASR
   Control bulb of the lock of ignition
   Control bulb of headlights of a driving beam
   Control bulb of a safety cushion
   Control bulb of ABS
   Control bulb of the parking brake
   Control bulb of a battery charging
   System of autocontrol of the car
   Ignition lock
   Check of switches
   Alarm buzzer of lighting
   The warmed back glass
   Check of screen wipers and windscreen washers
   Engine of screen wipers
   The help at malfunctions
   The gulf of liquid for washing of glasses
   System of washing of headlights
   Adjustment of a mirror with the electric drive
   Central lock
   Window regulators with the electric drive
   Sliding/removable roof with the electric drive
   Radio receiver
   The antenna on back glass
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics

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The warmed back glass

Naked right rack of a roof

1 – connection of the antenna;
2 – connection of the back warmed glass;
3 – an antenna wire to the radio receiver;

4 – a pilot line from the radio receiver;
5 – amplifier of the antenna;
6 – a wire from the switch of the warmed glass.

The point of the weight (shooter) of the warmed back glass and the antenna is in back glass on the right back rack of a roof. It is available 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. 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 the warmed back glass, disconnects giving of current to glass approximately in 10 min.

Search of malfunctions

If the warmed back glass remains cold, the following opportunities are considered:


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

 Council: Three conducting paths above on the warmed back glass belong to the antenna and therefore do not heat up.