Audi A4

since 1994 of release

Repair and car operation

A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
+ injection System
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ ignition System
+ Lighting
+ Alarm equipment
- Tools and devices
   Check of control tools and bulbs
   The combined device
   Indicator of amount of fuel
   The 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 liquid
   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
   Warmed back glass
   Check of screen wipers and stekloomyvatel
   Engine of screen wipers
   The help at malfunctions
   The liquid gulf for washing of glasses
   System of washing of headlights
   Mirror adjustment with the electric drive
   Central lock
   Window regulators 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

Naked right rack of a roof

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

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

The point of weight (shooter) of warmed back glass and the aerial 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. 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, the following possibilities are considered:


    Defective safety lock. Defective switch. Dismantle (as it is described in this chapter) and check an electric control lamp, whether there is a tension in a white wire at the included ignition and the pressed switch. 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 a back part of the car and lateral facing of a seat. Check bringing wire to back glass: by means of a control lamp establish, whether there is a tension behind in a white submitting wire at the left on glass. (It also belongs to cars with the aerial in back glass.) On the right rack of a roof check, whether as it should be contact of glass to weight. 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 belong to the aerial and consequently do not heat up.