My 2010 F150 Lariat Supercrew stated this beep yesterday. Every 15 seconds I get one beep. It seems to be coming from the radio, and the louder the radio is, the louder the beep. Even with the radio off, I can still hear it.

I've done lots of searches on this topic, but they all seem to be related to an airbag system issue, where there are 5 beeps in a row. Mine is just one short beep every 15 seconds. Can't find anything in the owners manual about this either.

Any ideas?

 

Update:

Today I was looking at this issue again. I noticed that the beeping happens every 15 seconds even without the key being in the ignition. I happened to open the door and heard the beep. I had not even got in the truck. So, it appears its not coming through the radio.