Jeep 56007080AB Relay

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Several electrical accessories in the vehicle, such as the fuel injection system, horns, starter, and fog lamps use relays to transmit the electrical signal to the component. Relays use a low-current circuit (the control circuit) to open and close a high-current circuit (the power circuit). If the relay is defective, that component will not operate properly. Relays are mounted in the engine compartment fuse/relay box. Relays can be found in other locations; check your wiring diagram and component locator for exact locations. Note: Some relays are energized by a computer using a negative or positive feed. Do NOT bypass a relay from these connections unless you are sure of the source of the signal. The wiring diagram shows the routing and exact location of these input voltages.

Several electrical accessories in the vehicle, such as the fuel injection system, horns, starter, and fog lamps use relays to transmit the electrical signal to the component. Relays use a low-current circuit (the control circuit) to open and close a high-current circuit (the power circuit). If the relay is defective, that component will not operate properly. Relays are mounted in the engine compartment fuse/relay box. Relays can be found in other locations; check your wiring diagram and component locator for exact locations. Note: Some relays are energized by a computer using a negative or positive feed. Do NOT bypass a relay from these connections unless you are sure of the source of the signal. The wiring diagram shows the routing and exact location of these input voltages.

Use an ohmmeter to check continuity through the relay control coil, and if the relay contains a resistor or diode, check the resistance in the appropriate directions. Remove the relay from the vehicle and use the ohmmeter to check for continuity between the relay power circuit terminals. There should be no continuity between terminal 30 and 87 with the relay deenergized. Connect a fused jumper wire to terminal 86 and the positive battery terminal, and another jumper wire between terminal 85 and ground. When the connections are made, the relay should click. With the jumper wires connected, check for continuity between the power circuit terminals. If the relay fails any of the tests, it should be replaced.

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

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

Use an ohmmeter to check continuity through the relay control coil, and if the relay contains a resistor or diode, check the resistance in the appropriate directions. Remove the relay from the vehicle and use the ohmmeter to check for continuity between the relay power circuit terminals. There should be no continuity between terminal 30 and 87 with the relay deenergized. Connect a fused jumper wire to terminal 86 and the positive battery terminal, and another jumper wire between terminal 85 and ground. When the connections are made, the relay should click. With the jumper wires connected, check for continuity between the power circuit terminals. If the relay fails any of the tests, it should be replaced.

Most relays used in vehicles are often called ISO relays, referring to the international Standards Organization. The terminals of ISO relays are numbered to indicate their usual circuit connections and functions.