500X Battery keeps draining

[Darenfit]

A possible source of parasitic drain, that I've never seen mentioned elsewhere, is a faulty USB socket module. This was diagnosed on my 2017 500x by Fiat Maidstone as the cause of new batteries going totally flat in just a few weeks. I think they said it was giving a 0.75ah parasitic drain with ignition off.

The replacement USB module was going to be several hundred pounds so I asked them to simply disconnect the USB module in the lower front dash which also disabled the socket in the centre console. The 12v cigar lighter socket next to the front dash USB socket still works so I use a USB adaptor now.
I've had no further issues since then.

Its interesting that there are a few 500x owners complaining that their USB sockets are not working. If the socket has been unplugged from the loom I'd suggest leaving it that way.

 

[Darenfit]

Just wondering if you ever had any luck or even still have the car, Yesterday I worked with a 500x which had a small drain of 0.15Amps, the drain disappeared when pulling out fuse F36 15A which controls audio, heater, a/c, interior lights and USB port, the cause of this drain turned out to be the USB port in the centre console.

There is a small gap behind the port so it can be unplugged without having to remove any trims, if you can try unplugging that For a couple of weeks and see how you get on.

I had a faulty USB port giving a constant drain on this fuse. The dealer traced it to a faulty USB board guessing the 12v to 5v circuit. They disconnected the USB port which also took out the one in the centre console and I've had no problems since. Cigar lighter still works so use an adaptor now.