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
   The minus is connected to weight
   The help for orientation in the electrotechnical equipment of the car
   Connections of wires
   The central switching knot
   Support of additional relays
   Box for electronics
   The relay and management blocks
   The switching relay
   H-contact of the relay of unloading
   The table of the relay and management blocks
   Safety locks
   The table of safety locks
   + Electric schemes
   + The accumulator
   + The generator
   + Starter
+ Ignition system
+ Illumination
+ The alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics

Safety locks

Each electric device in the car requires only the certain, precisely established quantity of a current. According to this consumption of a current in the given electric chain, naturally, the cross-section section of its wire has been defined. If current consumption increases in this electric chain, for example, at the expense of the consumer connected in addition or as a result of short circuit the wire is overloaded. Thus the wire is warmed up or even is heated, if current giving in time is not interrupted. It is done by safety locks.

That Audi at defect occurrence it has not appeared completely disconnected, safety locks are integrated into various electric chains. Though electric chains between the accumulator, the generator, a starter and the lock of ignition by safety locks are not supervised.

Replacement of safety locks


  1. If one of штекерных safety locks for these purposes you can take advantage of small plastic nippers which are attached to a cover of a box with safety locks (on the left face party of a control panel) has to be replaced.
  2. Pay attention to that in Audi A4 there are safety locks of the smaller size (tiny fusible), than in previous models.
  3. If the new safety lock fuses at once, find out, maybe, too weak safety lock is put.
  4. If it not so under the table of safety locks define the connected consumers and check up them on one. With it you will be helped by the corresponding electric scheme.
  5. In a doubtful case disconnect all consumers and again serially connect. The consumer at which connection will fuse a safety lock, was faulty.

Additional safety locks

At the certain expanded complete set on a 8-seater support of additional relays at the left under a control panel auxiliary safety locks take places. Thus it is a question of so-called thermosafety locks more often. These are safety locks which at an overload of an electric chain for a certain time interrupt a current stream, and then again restore connection.

Inside (3) left face parties of a control panel in a clip are in facing small plastic nippers (2) to take out safety locks, and a crank (4) for an emergency control a sliding roof. In drawing placing of safety locks in a box (1) is below shown.