What are the functions and testing procedures for relays in electrical systems on Saturn Vue?

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Some of the electrical adjuncts of the car including fuel injection, horns, starter motor, and fog lamps, employ relays to transfer electric intelligence to parts. Relays control a low current control circuit to open and close a high current power circuit and a faulty relay will cause the non-functioning of the relevant component. They are usually placed in groups in the engine compartment fuse/relay box while some few, complicated ones are placed near the interior fuse box in the dashboard. In case a relay is thought to be bad, it can be pulled out and checked according to a routine or by a dealer service department/repair shop: bad relays have to be changed as a set. Typically the type of relays are known as 'ISO' relays and on their terminals there are numbers which specify the typical circuit connections and usage of the relay. Two of the terminals are used as the relay control circuit and is connected to the relay coil while the others constitute the power circuit. When energized the coil, creates a magnetic field that makes the larger contacts of the power circuit to close so as to allow power for the circuit loads. Terminals 85 and 86 usually refer to the control circuit; with a diode connected the terminal 86 goes to battery positive voltage and terminal 85 to the ground if a resistor has been fitted then the position of the terminals 85 and 86 can be reversed. Terminal 30 normally provides the connection to the battery voltage for the circuit loads, while terminal 87 connects to the component that is being powered, with the additional terminals, 87A, 87B, 87C and so on for the alternate load or ground connection. Continuity through relay control coil can be checked with an ohmmeter, one should connect the meter supplies according to the polarity to obtain one readout and then reverse the leads for another reading. when a resistor is connected the resistance should offer the same resistance in each of the directions if a diode has been connected, then it gives a high resistance in forward polarity direction. If both resistance values are infinite, in the forward and backward directions, it is necessary to replace the relay. Interruption of the relay should leave no continuity between the power circuit terminals; therefore, no continuity should be obtained in terminal 30 and 87 when the circuit is de-energized. When a fused jumper wire is connected to the terminal 86 and the positive terminal of the battery, and another fused jumper wire from terminal 85 to the ground, the relay should activate and click. When the jumper wires are connected then continuity between the power circuit terminals should be present between the terminals 30 & 87. Periodically, the relay should be subjected to the following tests; if the relay fail any of them, they should be replaced.

Genuine Saturn Vue Relay

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Saturn Vue Relay

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