Question about 2002 Kia Sportage

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My main relay makes a buzzing sound with the ignition switch in the off position

Not sure why my main relay would buzz with the ignition switch off it is making noise while the car is off

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On a replay there are 2 particular connections that cause that. When you look for numbers on that relay you will find the numbers 30, 85, 86, 87 and 87a. The problem is their is power going to 85 or 86 (they are the 2 control terminals that control the relay). that should not be. basically 87a allows power to go through the relay when the system is shut OFF, Terminal 87 is the path of power that turns on whatever is connected to it. Now... 85 and 86... one of them is ground... the other power. Typically 85 is ground and 86 power. Now to better explain what is going wrong. you have a connection that feeds power to 87a. that power is powering 87 which powers 86. when power is turned on at 87... it turns on 86... that causes the relay to pick up an break the connection of power to 87a while at a fraction of a second later making the contact to 87. So... the path of power is turning the relay on and off all by itself, LOL. I know this is confusing, sorry. But I hope it helps

Posted on Dec 19, 2014


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Just tow choice in your 2003 Kia Truck Sorento 3.5L SFI DOHC 6cyl:
- Your Ignition Switch is damaged; or,
- Your wires for the Warning Buzzer Relay is damaged.

Even when the OFF position any connection is open and drain your battery.

Check it and tell us news.

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