Scion 88263-21010 Relay, Skid Control

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Several electrical accessories in the vehicle, such as the fuel injection system, and horns starter use relays to transmit the electrical signal. Next, relays use a low-current circuit, the control circuit, to open and close a high-current circuit, the power circuit. Also, most relays are mounted in the engine compartment and interior fuse/relay boxes.

Some electrical accessories in a vehicle that use relays include the fuel injection system, horns starter, and fog lamps.

If a relay fails the test, it should be replaced.

On most relays, two of the terminals are for the relay control circuit (connecting to the relay coil), and the other terminals are for the power circuit (connected together within the relay when the control-circuit coil is energized).

To test a relay, connect an ohmmeter across the two terminals of the power circuit; continuity should not be indicated. For a typical four-terminal normally open relay, connect an ohmmeter to the power circuit terminals; the meter should indicate continuity when the relay is energized and no continuity when not energized. Then, connect a fused jumper wire between one control circuit terminal and the positive battery terminal, and another jumper wire between the other control circuit terminal and ground. The relay should click and continuity should be indicated on the meter. If it doesn't click, try swapping the jumper wires.

If the relay fails the test, it should be replaced.

If a relay is defective, the component it controls will not operate properly.

Some electrical accessories in a vehicle that use relays include the fuel injection system, horns, starter, and fog lamps.

It's best to refer to the wiring diagram for the circuit to determine the proper hook-ups for the relay you're testing.