Buick 19115080 Relay,PCM

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Many electrical devices in the vehicle, including the fuel injection system, horns, starter as well as the fog lamps, use relays in switching circuits where a low current control circuit is used to control a high current power circuit. If there is something wrong with the relay then this will not allow the component that is connected to it to work properly; most of these relays are in the engine compartment fuse /relay box while other specialized ones are above the interior fuse box in the dashboard. If there is suspicion that the relay is bad, the faulty relay can be pulled and examined, whether a special test procedure, dealer service or a repair facility or bad relays have to be replaced in their entirety. In most of these cars, you will find ISO relays, which have numbers on their terminals to show the positions of different circuits and their roles of operation and these have two typical terminal arrangements. The one end of the control circuit is connected to the relay coil while the other ends of the terminals are incorporated in to the power circuit where the coil has the capability to develop a magnetic field which tends to clamp the larger contacts for power. Terminals 85 and 86 virtually function as the control circuit; special connection may be needed if a diode or resistor is inserted. Terminal 30 connects to the positive side of the battery voltage while terminal 87 connects to the component being energised and there are other terminals numbered for other connection points. Thus the relay can be tested using an ohmmeter, it is possible to measure the continuity through the control coil and resistance values will and the behavior will be normal depending upon the position of the resistor and diode. There should be no continuity from terminal 30 to 87 when the relay is non - energized. To test it, link a fused jumper wire to terminal 86 and the positive battery terminal, and another fused jumper wire to terminal 85 and ground: the relay should click and energise, and there should be continuity between terminals 30 and 87. However, if there is any failure that is pointed out by any of the tests then the relay should be replaced.

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.

Most relays are typically located in the engine compartment and interior fuse/relay boxes, with some models having fuse blocks or electrical centers beneath the rear seat or in the trunk.