Hummer 13500126 RELAY ASM,WSW MOT *BLACK

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In the vehicle, the electrical accessories including the fuel injection system, horns, starter, and fog lamps employs a relay to send the electrical signal to the concerned component. Relays work on a principle by which a low current circuit is used to switch on and off a high current circuit. In other words, when a relay is faulty the related component will not operate as required. All relays are arranged in the engine bay and compartment as well as interior fuse/relay boxes; the engine compartment fuse and relay panel is on right side of the engine compartment; the front interior fuse/relay box is behind the left end cap of the instrument panel and includes a fuse and relay card located on the back cover.

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.

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. Defective relays can cause components to not operate properly. Most relays are located in the engine compartment fuse/relay box and must be replaced as a unit if they are defective. ISO relays, which follow International Standards Organization standards, are commonly used in these vehicles. The terminals on ISO relays are numbered to indicate their circuit connections and functions. The control circuit terminals are usually 85 and 86, while the power circuit terminals are 30 and 87. Terminal 86 is connected to battery positive (B+) voltage and terminal 85 is connected to ground if the relay contains a diode. If the relay contains a resistor, terminals 85 and 86 can be connected in either direction with respect to B+ and ground. Terminal 30 is connected to the battery voltage source, while terminal 87 is connected to the ground side of the circuit. An ohmmeter can be used to check continuity through the relay control coil, and if there is infinite resistance in both directions, the relay should be replaced. The relay can also be tested by checking for continuity between the power circuit terminals and by using jumper wires to connect the relay to the battery. If the relay fails any of these tests, it should be replaced.

Some of the accessories that are featured in the vehicle and leverage on the relay include the fuel injection system, horns, starter, and fog lamps. A relay works through a low current control circuit to switch on and off a high current circuit and a faulty relay would deny a circuit the required path. Main relays are usually placed in the engine compartment fuse/relay box, additional more specific relays are located above the interior fuse box in the dash. If one is believed to be defective, a relay is easy to remove and may be tested either through a detailed prescribed sequence or with the help of a dealer service department or a repair shop; defective relays must be replaced en bloc. In most of these vehicles, we find the ISO relays which have numbers on the terminal referring to circuits and their various roles, and there are two typical terminal configurations. The wiring diagram of the circuit will indicate the correct position of the connection point and hence the proper position for testing and if this is not clear then other information may help to draw the right position of the test connections. While two of the terminals are connected to the relay control circuit and relay coil respectively, the other two, are in the power circuit. When energized, the coil produces a magnetic field that makes the larger contacts of the power circuit appear closed so as to supply power to the circuit loads. Terminals 85 and 86 are often the control circuit; if there is a diode then terminal 86 connects to battery +ve and terminal 85 to -ve while a resistor enables either way. Terminal 30 is typically linked with the battery voltage input for circuit loads while terminal 87 is connected with the unit that has to be powered, with other terminals being 87A, 87B and so on for optional contacts. For continuity check of the relay control coil, it is advisable to use an ohmmeter but carry out the check with a reversed polarity also if there is a resistor the resistance should read the same when the probe is reversed in the same way if there is a diode it should read relatively higher when the probe is reversed. If values of the resistance are infinite both from the primary and from the secondary side then it is likely to change the relay. Lacking the relay, there must be no continuity between the terminals of the power circuit; in particular there must be no continuity between terminal 30 and 87 when no voltage is applied. By joining a fused jumper wire between terminal 86 and the positive battery terminal, then another between terminal 85 and the ground, the relay should 'click'. When the jumper wires are connected, continuity should now be present between terminals 30 and 87 if the relay fail any of them, it shoud be replaced.

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.

Typically, relays are mounted in the engine compartment and in the interior fuse and relay boxes.

The relays used in vehicles are typically ISO relays, adhering to International Standards Organization standards.

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

Terminals 85 and 86 typically serve as the control circuit, with specific connections required if a diode or resistor is present.

Two of the relay terminals serve as the control circuit and connect to the relay coil, while the remaining terminals function as the power circuit.

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

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

Several electrical accessories in the vehicle, including the fuel injection system, horns, starter, and fog lamps, utilize relays to transmit electrical signals to the components.

Relays operate by using a low-current circuit, known as the control circuit, to open and close a high-current circuit, referred to as the power circuit.

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.

If a resistor is present, resistance should be the same value in either direction. If a diode is present, resistance should be higher in the forward polarity direction. Infinite resistance in both directions indicates that the relay should be replaced.

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

After removing the relay, continuity should be checked between the power circuit terminals, confirming no continuity between terminal 30 and 87 when de-energized.

The wiring diagram for the circuit can help determine the proper connections for testing.

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

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

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

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.

When using an ohmmeter to test the continuity of a relay's control coil, one should ensure proper polarity during testing. Resistance should remain consistent regardless of the ohmmeter leads' polarity. Infinite resistance in both directions indicates the need for relay replacement.

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.

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

Terminal 30 usually connects to the battery voltage source for circuit loads, and terminal 87 connects to the component being powered, with additional terminals numbered 87A, 87B, and so on for alternate connections.

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

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

Various relays are grouped in different locations, with some located in the convenience center under the right side of the dashboard behind the sound insulator panel, while later models have this center under the left side of the instrument panel.

Relays employ a low-current control circuit to manage a high-current power circuit.

Several electrical accessories in the vehicle, such as the fuel injection system, horns, starter, and fog lamps, utilize relays to transmit electrical signals to components.

If the relay fails any of these tests, it should be replaced.