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Dead Battery & buzzing from back seat.

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Old 10-17-2014, 02:00 PM   #1
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Default Dead Battery & buzzing from back seat.

Hey guys I need some help. My f150 king ranch all of a sudden wont crank, click, beep, fart (lol) as well as not one light will come on or even flicker when I open the door or place the key in the ignition. The truck is completely dead. The only thing I do hear, is a constant buzzing sound which sounds like a fuel pump would when purging. When I turn the key, nothing happen once again but the buzzing sounds actually stops. It sounds like its coming from behind the back crew seat on the drivers side. I went under the truck, into the cab, everywhere I could get my ear and hands and I cant fell a vibration or feel any electrical component warn as if it was overheated from being shorted out.

I went online and read some forums and found some ppl talking about a keyless entry relay which supposedly is mounted to the cab on the back wall behind the back crew seat. Is this in fact the "keyless entry relay" or some other conponent??? If so does this sound like it could be the cause to the problem im having??? Is this a dealer item or can I find it elsewhere???

Hope to hear back from any and everyone who has some insight on this issue im having.

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Old 10-17-2014, 02:14 PM   #2
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What year?
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Old 10-18-2014, 09:32 AM   #3
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Default Dead battery and buzzing from back seat

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Old 10-18-2014, 09:38 AM   #4
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I got to the "body security module" behind the seat and disconnected it. I then reconnected the jumper cables and was able to jump the truck unlike before while the module was connected.
I'm assuming it was the cause. If anyone thinks differ please inform me.
If it is the cause, am I going to be able to just replace the module or and I going to have to replace the module and other items which are connected to the system in order for it to all work in conjunction with the new module?????
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Old 10-18-2014, 09:46 AM   #5
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First check voltage on your battery and load test it if you can. If you have a different key (if it has a chip in it) try that. Keys can go bad for many reasons. If you don't have another key you might take the on you have to a dealer and have it checked.If it's bad the dealer can charge up to $400 to replace it. Extra keys are about $75.00 at Lowes, but only if yours is OK. The buzz is your factory security system module. It should be located behind the "B" pillar cover panel in the lower corner of the seat and the back wall.
2000 F-150 XLT Ext Cab. 4.2L V-6 153K miles
1992 Explorer XLT 4x4 5 speed stick 229K miles
1970 F-250 Camper Special 390 Auto 293K miles
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