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
   Wires
   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









H-contact of the relay of unloading

The unloading relay (the usual switching relay) plays a considerable role in onboard the electrician. Therefore here its function is described:
On the plug 75 locks of ignition the current arrives only in the event that the ignition key is in position "is included". Powerful consumers of a current, for example, the screen wipers, warmed back glass or a supercharger of air, are connected to this plug that at engine start on a starter there was all capacity of the accumulator. Certainly, not all these consumers can receive power supplies through contact to the ignition lock; for this purpose it is too weak. Therefore between them the relay through which working contact current giving is carried out should be connected. Contact of the lock of ignition (along with current giving on headlights and the coil of the relay of a sound signal) provides only giving of a switching current to the relay.