Mercedes-Benz G-class (W463) since 1999 of release
1. Introduction
2. Governing bodies and operation receptions
3. Current leaving and service
4. Engine
5. Systems of cooling, heating, ventilation and air conditioning
6. A power supply system and production of the fulfilled gases
7. Systems of electric equipment of the engine
8. Automatic transmission
9. Transmission line
10. Brake and auxiliary systems
11. Suspension bracket and steering
12. Body
13. Onboard electric equipment
13.1. General information
13.1.1. General information and precautionary measures
13.1.2. Search of causes of failures of electric equipment
13.1.3. Safety locks - the general information
13.1.4. Chain breakers - the general information
13.1.5. The relay - the general information and check of serviceability of functioning
13.1.6. Digital tire of data of CAN
13.2. Assembly blocks and management modules
13.3. Switches
13.4. Driving electromotors, sensors
13.5. Alarm and lighting devices
13.6. Systems of additional safety (SRS)
13.7. Audiosystem, navigation and mobile phone
14. Schemes of electric connections



13.1.5. The relay - the general information and check of serviceability of functioning

General information

Principles of functioning of the relay of various type

For giving of power supply or a management signal on many of consumers of the electric power in the car (such as components of system of injection of fuel, a horn, a starter, the fan (ы) cooling systems, fog lights and so forth) are used by the relay. Actually, the relay represents the electric key providing short circuit of VV of a contour on NV to a signal. In case of a relay exit out of operation there is a refusal of functioning of the corresponding consumer. The most part of the relay is located in an impellent compartment, others "are scattered" on the car. The description of check of serviceability of functioning of the relay is provided below. The failed relays are subject to replacement.


Always it is possible to define correctness of connection of the relay on given in the Part H of the present Chapter to schemes of electric connections.

Usually the management contour always is connected to two of contact plugs of the relay. When giving on these NV plugs of tension the current starts to circulate on a winding of management of the relay therefore there is a short circuit of big contacts of a working contour of the consumer of the electric power. Other plugs are plugs of working (VV) of a contour and become isolated among themselves when giving food on a management contour.

For the purpose of simplification of identification of plugs of the relay explanatory marking is usually put on its case with the image of the scheme of connection of keys. If similar marking is absent, it is necessary to address to schemes of electric connections (see. Schemes of electric connections).

For check connect an ohmmeter between two VV plugs of a contour of the relay, - in the relay of normally opened type conductivity should be absent. Now connect the wire crossing point equipped with a safety lock between one of plugs of management of the relay and the positive plug of the battery (In +). By means of other wire crossing point earth the second plug of management, - the relay should publish click after which the ohmmeter will fix conductivity existence (the relay of normally opened type). Some relays demand obligatory observance of polarity of connection.

At negative result of check replace the relay.

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13.1.6. Digital tire of data of CAN