2006 Nav Radio issue! Any ideas?
 

Sorry about duping this, but as this forum is divided to Ford / Mercury, I'll post this on both as they are identical on this...

Anyway, our 2006 MMH has a factory Nav-radio. The Nav is useless over here in Scandinavia (no maps available even from Ford) and radio only picks half the stations due to 200 KHz resolution between stations. (We use 100 KHz resolution here.) But the CD (and the 6-pack) work fine and the display shows nice MPG-graphs, so we've kept it.

But now the radio seems to come on byitself! It has run down the 12 V battery down twice during the night. For temporary fix, I've taken out the fuse, but that also is the fuel gauge fuse that sets a DTC for the emission system. So no good there either.

Question is: Has anyone come across this before and know the cause for it?

Please, no "take it to Ford" answers. Not gonna do it. I'm now looking for answers to the cause of the issue...