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

The aerial on back glass

As the aerial for reception of average waves in this type of aerials three metal current-carrying paths in the top of glass are used.

For reception of VHF other current-carrying paths which at the same time serve as heating elements serve. The insufficient height of this system of aerials is compensated by the amplifier under the left back facing of a rack of a roof.

Search of malfunctions in the aerial of back glass

Back facing of a rack of a roof can be removed, having shown a great patience and dexterity, in cars with a leaning-back back of a back seat without other razborochny works. But in cars with a rigid back without its dismantle not to manage. As a whole work is facilitated after dismantle of a back reception pocket and lateral facing of a leaning-back seat (head Salon).


  1. Remove both facings of racks of a roof behind.
  2. Check connection with mass of heating of back glass on the right rack of a roof, and also, whether the amplifier of the aerial fixing screws is reliably connected to weight.
  3. Attentively check the top three current-carrying paths on back glass: whether there is a visible gap? If yes, carry out repair by a current-carrying silver varnish or put new back glass.
  4. Now electric check follows: Disconnect the socket of a thin white tokopodvodyashchy wire above on the amplifier, measure tension concerning weight. For this purpose include a radio receiver.
  5. Existence tension from the accumulator: current giving on the amplifier as it should be. There is no tension: eliminate a gap in a wire.
  6. On the same wire measure a current between the socket of the amplifier and the removed wire.
  7. The ampermeter should show 30–50 мА, otherwise the amplifier of the aerial does not consume a current and, therefore, it is faulty – replace.
  8. Following check: disconnect the bottom wire on warmed back glass, include ignition and heating of back glass, measure tension in a wire.
  9. In it there should be a tension of the accumulator, otherwise malfunction in a tokopodvodyashchy wire or in the amplifier, outline damage.
  10. Disconnect bottom (thick white) a wire on the amplifier, measure tension at the included ignition and heating of back glass:
  11. If there is a tension of the accumulator, a tokopodvodyashchy wire as it should be, possibly, the amplifier is faulty. If is not present, on the contrary.

Loudspeakers in facing of a forward door

The loudspeaker of average frequencies located below, is also screwed behind on door facing. Figures from «1» to «3» designated fixing screws.


  1. Dismantle facing of a forward door.
  2. Carefully remove being behind door facing a dempfiruyushchy film from polyfoam.
  3. Disconnect the wire socket in a connecting wire from bottom to the top loudspeaker.
  4. Loudspeaker of average frequencies: weaken three fixing screws of loudspeaker and take out directing wires.
  5. Loudspeaker of high frequencies: weaken the screw with a crosswise head behind on dynamics, remove the loudspeaker.

Back loudspeaker

The back loudspeaker is screwed from above on body metal under a reception pocket (arrow). That it to dismantle, it is necessary to remove a back reception pocket in the beginning.


  1. Dismantle a back reception pocket (head Salon).
  2. Weaken screws with crosswise heads, remove the loudspeaker.