Audi A4, S4

since 2000 release

Repair and operation of the car

Audi A4, S4
+ Introduction
+ Governing bodies and methods of safe operation
+ Current leaving and service
+ Engine
+ Cooling systems, heating and air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Body
- Onboard electric equipment
   Diagnostics of malfunctions of onboard electric equipment - the general information
   Rassoyedineniye of sockets
   Check of the electric motor of a screen wiper
   Check of the warmed back glass
   Check of stoplights
   Removal and installation of a sound signal
   Removal and installation of sensors of a parking
   Replacement of the battery of a remote control of the ignition key
   Relay and safety locks
   Replacement of glow lamps of devices of external lighting
   Removal and installation of headlights
   Removal and installation of the lateral repeater of turns
   Removal and installation of an additional stoplight
   Removal and installation of a back lamp
   Removal and installation of a lamp of illumination of registration plate
   Removal and installation of plafonds of internal lighting
   Removal and installation of a control panel
   Removal and installation of the understeering switch
   Removal and installation of switches of a forward door
   Removal and installation of the switch of light
   Removal and installation of the switch of a window regulator in a back door
   Removal and installation of the switch of a trunk lid
   Removal and installation of the switch of the parking brake
   Removal and installation of the switch of illumination of a ware box
   Removal and installation of switches of the central console
   Removal and installation of the radio receiver / navigation device / CD changer
   Removal and installation of loudspeakers
   Removal and installation of antennas
   Removal and installation of the tank of liquid of the windscreen washer/electric motor of the pump
   Removal and installation of the electric motor of screenwash
   Removal and installation of the electric motor on back glass (Station wagon)
   The uniform lock - the general information
   Removal and installation of a locking element of a cover of a fuel tank
   Digital tire of data of CAN
   + Schematic diagrams of electric equipment

Relay and safety locks

Most of consumers of the electric power of the car is protected by fuses. Separate components of system of lighting, except for braking signal lamps, are protected by electronic relays.

At course of too strong current electronic interruption of an electric chain of the protected components is made. Through short time the electric chain automatically again becomes isolated at repeated emergence of malfunction the electric chain again interrupts.

Use fuses with the demanded current face value.

Do not repair the fused fuses and do not shunt a crossing point.

Establish the burn-out reason.

Replacement of the relay


Relays are in the dashboard from the driver.

  1. Remove a pocket from the driver, address to the Section Removal and installation of a pocket from the driver.
  2. Take out the damaged relay by means of special nippers, for example, of HAZET 4770-1.
  3. Check operability of the relay and, if necessary, replace it on new, address to appropriate section.
  4. Install the relay on a payment.
  5. Establish into place the driver's pocket, address to the Section Removal and installation of a pocket from the driver.

Replacement of safety locks

For protection of wires of electric equipment and consumers against damage at short circuit and an overload electric chains have safety locks.


  1. Before replacement of a safety lock it is necessary to switch off surely ignition and all consumers.
  2. Safety locks are in blocks of safety locks on the left side of the dashboard, behind a cover (address to an illustration in Specifications).
  3. Open a cover for what insert a screw-driver the flat party from below behind a cover (shooter) and wring out a cover.
  4. The arrangement of safety locks is presented on a reverse side of a cover of the block of safety locks.

The arrangement of safety locks depends on the equipment and year of release of the car. Besides, there also there is a krivoshipny handle for emergency closing of the shifted roof panel.

At repeated burn-out of a safety lock check electric equipment chains.