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Relay - the general information and check of serviceability of functioning

general information

For a power supply or control signal to many of the power consumers in the car (such as the components of the fuel injection system, a horn, a starter, the fan (s) cooling system, fog lamps, etc.) Used by the relay. Actually, the relay is an electrical switch that provides circuit BB circuit for signal NV. Relay Output failure inevitably leads to the rejection of the corresponding operation of the consumer. The two main relay (fuel pump and ignition) are placed in the engine compartment installed in the main assembly block, other "scattered" on the car. Description check serviceability of functioning of the relay is shown below. Faulty relay must be replaced.

The principle of operation of various types of relays

Check

Correct connection relays can always be determined on the connection diagrams given in the wiring diagrams of this manual.

Typically, two of the terminals are always connected relay control circuit. When applied to these terminals HB voltage current starts to circulate through the coil control relay, resulting in the closure of a large working contacts contour consumer. The other terminals are operating terminals (BB) circuit and are closed to each other when power to the control loop.

In order to facilitate the identification of the relay terminals on the casing is usually applied explanatory labeling schemes connected with the image of keys. If such labeling is not, refer to the connection diagrams (see. Wiring diagrams).