Toyota 28300-21020 Relay Assembly, Starter

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Many electrical consumer items in the vehicle require the fuel injection system, Horns, starter and fog lamps among others utilize relays to switch electrical signals to gizmos, where a low current control circuit governs a high current power circuit. A faulty relay will not allow correct functioning of the linked part; most of the relays are found in the engine bin fuse/relay boxes, while some others are hardwired above the interior fuse box in the car's dashboard. If a given relay is believed to be faulty, it has to be unbolted for possible examination either mechanically or by using dealer service department or repair shop procedure and where relays are defective, they must be replaced in their entirety. The existing varieties of relays are four, with some being of normally open and normally closed kinds; some of the types can close or open more circuits when they are energized. Regarding a preferred embodiment, two terminals are used as the control circuit that contributes to the connection with the relay coil, whereas other two terminals are used as the power circuit. Control and power circuit terminal may be marked on some relays while on other's it is not so the proper connections have to be determined. When checking a relay the ohmmeter should be connected across the power circuit terminals of the relay, having no continuity when it is not energized and continuity when it is energize. This implies that a fused jumper wire should be connected one terminal of the control circuit to the positive terminal of the battery and the other terminal to the ground and the relay emit a clicking sound and there should be continuity on the meter. If the relay is also not clicking, then the change of the jumper wires may be required. If the relay does not pass through the test it should be replaced.