GMC 15319851 Relay,Secondary Air Injection Pump

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Several electrical accessories in a vehicle, such as the fuel injection system, horns, starter, and fog lamps, use relays to transmit the electrical signal to the component. Relays have a control circuit and a power circuit, and if a relay is defective, the corresponding component will not operate properly. Most relays are located in the engine compartment fuse/relay box, with some specialized relays found above the interior fuse box in the console. To test a relay, it can be removed and checked for continuity using an ohmmeter. The terminals of ISO relays, commonly used in these vehicles, are numbered to indicate their circuit connections and functions. Terminal 85 and 86 are typically the control circuit, with terminal 30 connected to the battery voltage source and terminal 87 connected to the component being powered. If the relay contains a diode or resistor, specific polarity and resistance values should be observed. If the relay fails any of the tests, it should be replaced.

There should be no continuity between terminal 30 and 87 when the relay is de-energized.

Relays function by using a low-current circuit (the control circuit) to open and close a high-current circuit (the power circuit). When energized, the relay's coil generates a magnetic field that closes the larger contacts of the power circuit, supplying power to the associated component.

Relays are used to transmit the electrical signal to various electrical accessories in a vehicle, such as the fuel injection system, horns, starter, and fog lamps. They have a control circuit and a power circuit, with the control circuit opening and closing the power circuit.

Continuity through the relay control coil can be checked using an ohmmeter.

ISO relays follow International Standards Organization standards and are commonly used in vehicles for their standardized connections and functions.