Sorry for hijacking this thread, let me know if I should open a new one. I got the the Garmin Mini parking cable. It has three connections: ground, permanent live and accessory. I was testing with a multimeter today and found some suitable empty slots with no fuses in them but they still have the contact points.
Battery always on (as measured)
12 - Heated steering wheel ( I don't have it )
24 - Phonebox, GSM antenna, USB connection, Infotainment screen ( why empty? )
32 - Passenger belt tensioners
34 - Driver belt tensioners
Accessory
45 - Windscreen wiper ( why empty? )
46 - Seat heating - rear ( I don't have that )
I tested with 46 & 32 and the camera seems to work fine. I chose those two because I have one mini "piggy-back" connector and one standard size. My guess is that the " passenger belt tensioners" is some advanced feature that my car isn't equipped with, but I'm not 100% sure. I can definitely use 12 as the always on, I definitely don't have a heated steering whell, but it's a mini size fuse, so I'd have to buy another mini "piggy-back" connector. Do you guys think it's okay to use 46 & 32 for the camera?
Here are some images (the forum won't let me upload images) of the test setup.
https://imgur.com/a/wQr3ci7