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
   The minus is connected to weight
   The help for orientation in the electrotechnical equipment of the car
   Wires
   Connections of wires
   Central switching knot
   Support of additional relays
   Box for electronics
   Relay and control units
   Switching relay
   H-contact of the relay of unloading
   Table of the relay and control units
   Safety locks
   Table of safety locks
   + Electric circuits
   + Accumulator
   + Generator
   + Starter
+ ignition System
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics





Switching relay

Function of the switching relay

 PERFORMANCE ORDER

  1. At inclusion of a certain consumer in the switching relay «a switching current», arriving on the plug 86, 85 (weight) closes an electric chain to the plug.
  2. As a result of it the electromagnetic coil draws powerful contact, counteracting pressure of a spring, and thus closes an electric chain for passing of «a working current».
  3. To avoid power failure, the working current moves a short way on the plug of 30 relays and from there, at the closed contacts of the switch, via the plug 87 further to the consumer.
  4. Sometimes there is one more plug 87а. It is closely connected with the plug 87, i.e. at it the same function.

Search of malfunctions in the switching relay

 PERFORMANCE ORDER

  1. On the plug 30 always there should be a tension (tension giving for working contact).
  2. To check tension giving, take out the relay and knock with a needle of a control lamp on the plug 30 in a relay socle. There is no current: defect in a tokopodvodyashchy wire.
  3. If the corresponding switch is switched on, on the plug 86 there should be a tension, (tension giving on the relay coil).
  4. For check knock on the plug 86 in a relay socle with a needle of a control lamp.
  5. There is no current: defect in a wire or in the switch.
  6. The plug 85 is a weight wire to the coil. A control lamp check the accumulator – + (for example, the plug 30).
  7. The coil of the relay is checked on the removed relay: connect the plug 86 to plus of the accumulator and the plug 85 with weight. The electromagnetic coil should draw relay contact with a distinct sound, otherwise the relay is defective.

The temporary help at the faulty switching relay

 PERFORMANCE ORDER

  1. Take out the relay from the socket.
  2. Close the plug 30 and 87 in a relay nest a writing paper clip or a piece of a wire. Thanks to it the corresponding consumer will receive a direct current.
  3. That it to switch off, disconnect short-circuiting crossing point as in this case this consumer will close.