Pontiac 19118886 Relay Asm,Multiuse

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A number of electrical accessories in the vehicle incorporate relays on the transmission of electrical signals to the components, and if the relay is faulty, the related component is not functional. Some relays are mounted in several areas; the relays on the firewall are representative of relays found throughout the vehicle. When an actuating relay is thought to be bad, then the relay can be disconnected and taken to a dealer service department or a repair shop, and if determinative the relays are needed are bad then the unit must be replaced.

Several electrical accessories in the vehicle utilize relays to transmit electrical signals to components, and a defective relay will prevent proper operation of that component. 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. To test a relay, it's advisable to consult the wiring diagram for the circuit to determine the correct hook-ups; if that's not possible, the following information may assist. Most relays have two terminals for the control circuit, which connect to the relay coil that closes the large contacts when energized, while the other terminals form the power circuit, connected internally when the control circuit is energized. Relays are typically marked to help identify control and power circuit terminals. To test, 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 upon making these connections. If it doesn't click, polarity may be critical, so swapping the jumper wires on the control circuit terminals may be necessary. With the jumper wires connected, check for continuity between the power circuit terminals as indicated by the relay markings. If the relay fails any of these tests, it should be replaced.

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.

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

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

In the case of a defective relay, it must be replaced as a whole unit.

Terminal 30 is connected to the battery voltage source, while terminal 87 is connected to the ground side of the circuit.

The two fundamental terminal layouts for relays used in vehicles are often labeled externally for ease of identification regarding control and power circuits.

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

Most relays are located in the engine compartment fuse and relay box, while some can be found in various wiring harnesses underneath the instrument panel.

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.

When energized, the coil creates a magnetic field that closes the larger contacts of the power circuit to provide power to the loads.

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

If the relay contains a resistor, terminals 85 and 86 can be connected in either direction with respect to B+ and ground.

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

Most relays are located in the engine compartment or interior fuse/relay boxes of a vehicle.

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

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

If a relay is faulty, 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.

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

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

Terminals 85 and 86 typically represent the control circuit; if a diode is present, terminal 86 connects to battery positive voltage and terminal 85 to ground. If a resistor is present, terminals 85 and 86 can connect in either direction.