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The relay - the general information and check of serviceability of functioning The general information For giving of power supplies or a management signal on some of electric power consumers in the car (such as components of system of injection of fuel, a horn, a starter, the fan (cooling systems, antifog headlights and so forth) are used the relay. Actually the relay represents the electric key providing short circuit ВВ of a contour on НВ to a signal. In case of a relay exit out of operation there is a refusal of functioning of the corresponding consumer. The relay most part is placed in located under the panel of devices and in an impellent compartment of the car assembly blocks. The description of check of serviceability of functioning of the relay is resulted more low. The failed relays are subject to replacement. Check If it is not possible to find out a way of inclusion of the relay in a corresponding electric contour under schemes of electric connections (the Section of the Scheme of electric connections see), it is necessary to remember that the approach to check of any relay basically is identical in all cases. In the majority of the relay the management contour is always connected to two of contact plugs. At giving on these plugs NV of pressure the current starts to circulate on a winding of management of the relay therefore there is a short circuit of the big contacts of a working contour of the consumer of the electric power. Other plugs are plugs working (ВВ) a contour. For the purpose of simplification of identification of plugs of the relay explanatory marks are usually put on its case with the image of the scheme of connection of keys.
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The constructive scheme of the typical 4-contact relay with numbering of plugs and planimetric connections |
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The constructive scheme of the typical 5-contact relay with numbering of plugs and planimetric connections |
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- Before relay removal make sure that the corresponding contour is disconnected.
- Connect the wire-crosspiece equipped with a safety lock between one of plugs of management of the relay and the positive plug of the battery. By means of the second wire-crosspiece earth the second plug of management, - the relay should publish click. Some relays demand obligatory observance of polarity of connection, - if click has not occurred, try to change polarity of connection of plugs of management.
- At the connected wires-crosspieces check up conductivity presence between contour plugs VV, having connected an ohmmeter according to the key scheme on the relay case.
- At negative result of check replace the relay.
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