Question about 1999 Saturn SL
Your car is constructed with many electrical relays. These control relays are used like a switch that utilizes an electrical trigger signal to activate. Once a relay is activated it will connect an electrical supply to a particular accessory. These accessories can range from the main ECM (computer control) to a fuel pump. Most control relays work on the same principle even though their terminal configuration can vary slightly. There are two tests that need to be considered when dealing with a relay problem. Is the problem with the actual relay or the power, ground or trigger circuits that activate the relay. In this car repair guide we will test the relay contacts, operation and activation circuits. A relay is more prone to failure when it is warm. A rely can be considered into two separate halves. The first or primary half of the relay utilizes an electromagnet to close the secondary electrical circuit inside the relay. This electromagnet is activated by a simple power (+) and ground (-) much like a light bulb circuit. The second half of the relay is the "switch" that controls the power to a particular accessory like a fuel pump or ignition system. So, to re-cap, if you activate the primary side of the relay (electromagnet) it closes the contacts (switch) to supply power to operate an accessory. The relay primary side activation can be done manually, example: headlight switch on the dash activates the headlight control relay to supply power to the headlights. Or the relay primary side activation can be done automatically, example: When the ECM (computer) commands the fuel pump to turn "on" it will send an electrical signal to activate the fuel pump relay. The secondary side of the relay is the "switch" and does exactly as it is described; turn "off "and "on" power to an accessory. The guide below covers the most popular wiring configuration. Most relays are located in your car's fuse or power distribution center, to find a particular system relay for your car consult your owner's manual or a car repair manual.
Relay Terminal Identification
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Posted on Jul 03, 2010
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Posted on Jan 02, 2017
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