GM 13500114 RELAY ASM,ACSRY TIME DELAY CUTOFF *GRAY

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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, with the control circuit opening and closing the power circuit. If a relay is defective, the corresponding component will not function properly. Most relays are located in the engine compartment or interior fuse/relay boxes. To test a relay, it can be removed and checked for continuity using an ohmmeter. The terminals of ISO relays are numbered to indicate their circuit connections and functions. Terminals 85 and 86 are typically the control circuit, with terminal 86 connected to battery positive voltage and terminal 85 to ground if the relay contains a diode. Terminal 30 is connected to the battery voltage source, while terminal 87 is connected to the ground side of the circuit. If the relay has multiple load or ground connections, they are usually numbered 87A, 87B, 87C, etc. Continuity through the relay control coil can be checked using an ohmmeter, and there should be no continuity between terminal 30 and 87 when the relay is de-energized. By connecting jumper wires to the appropriate terminals and the battery, the relay should click and there should be continuity between terminals 30 and 87. If the relay fails any of these tests, it should be replaced.

If the relay fails the tests, shows infinite resistance, or if any of the tests indicate a failure, the relay should be replaced. It can also be taken to a dealer service department or repair shop for evaluation.

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.

To examine continuity through the relay control coil, follow the polarity indicated in the illustration during testing and reverse the ohmmeter leads to check continuity in the other direction. A relay with a resistor should yield consistent resistance values in both directions, while a diode should exhibit higher resistance in the forward polarity direction.

Most relays are located in the engine compartment fuse/relay box, with some specialized relays located above the interior fuse box in the dash.

If a faulty relay is suspected, it can be removed and tested by a dealer service department or a repair shop.

Terminal 86 is connected to battery positive (B+) voltage, and terminal 85 is connected to ground if the relay contains a diode.

A relay can be tested by removing it and checking for continuity using an ohmmeter.

To diagnose a suspected faulty relay, it can be removed and tested using the procedure outlined below or by consulting a dealer service department or a repair shop. Defective relays should be replaced as complete units.

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

Most relays can be found in the engine compartment and interior fuse/relay boxes.

If a faulty relay is suspected, it can be removed and tested by a dealer service department or a repair shop.

If a relay is defective, the corresponding component will not function properly.

If a relay is defective, the corresponding component will not function properly.

A suspected faulty relay can be removed and tested using an ohmmeter to check continuity through the relay control coil and power circuit terminals.

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

Several electrical accessories in a vehicle rely on relays to transmit electrical signals to their respective components.

Most relays are located in the engine compartment fuse/relay box.

In relays with diode terminals, terminal 85 and 86 are usually the control circuit, with terminal 86 connected to battery positive (B+) voltage and terminal 85 to ground. If the relay contains a resistor, terminals 85 and 86 can be connected in either direction with respect to B+ and ground.

Relays are used in a vehicle's electrical system to facilitate the transmission of electrical signals, allowing low-current control circuits to open and close high-current power circuits. They help control various components like the fuel injection system, horns, starter, and fog lamps.

The terminals of ISO relays are numbered to indicate their circuit connections and functions.

These relays are typically grouped together in various locations, including the engine compartment.

Relays are used in several electrical circuits in vehicles to transmit electrical signals to components.

The terminals of ISO relays are numbered to indicate their usual circuit connections and functions.