Contents: General information ⬇ Examination ⬇
General information
1. To supply power or control signal to some of the electrical consumers in the vehicle (such as fuel injection system components, horn, starter, cooling fan, fog lights, etc.) relays are used. In fact, a relay is an electric key that ensures the closure of a high-voltage circuit by a low-voltage signal. If the relay fails, the corresponding consumer will fail to function. As a rule, relays are installed in fuse box mounting blocks (see Section 3). A description of how to check the proper functioning of the relay is given below. Failed relays are subject to replacement.
Examination
2. If it is not possible to find out how to connect the relay to the corresponding electrical circuit using the electrical connection diagrams (diagrams are provided at the end of the Manual), it should be remembered that the approach to testing any relay is, in principle, the same in all cases (see below).
3. In most cases, the control circuit is always connected to two of the relay contact terminals. When low-voltage voltage is applied to these terminals, the current begins to circulate through the relay control winding, resulting in the closure of the large contacts of the working circuit of the consumer of electrical energy. The remaining terminals are the terminals of the working (HV) circuit.
4. In order to facilitate the identification of the relay terminals, explanatory markings with an image of the key connection diagram are usually applied to its body.
5. Before removing the relay, make sure that the corresponding circuit is de-energized.
6. Connect a fused jumper wire between one of the relay control terminals and the positive battery terminal. Use a second jumper wire to ground the other control terminal - the relay should click. Some relays require that the polarity of the connection be observed; if there is no click, try reversing the polarity of the control terminals.
7. With the jumper wires connected, check for conductivity between the terminals of the high-voltage circuit.
8. If the test result is negative, replace the relay.
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