Hi New to forum any help appreciated . I have a 2010 Japanese import and fitted an rns315dab out of a seat and it will not remember presets on the radio.everything works and they store ok but when you leave the car for an hour and come back it's back to untuned. I have looked at the loom and the 2 power cables are the same red/orange and brn earth I have swapped the lives over and it made no difference so think it may be the multimedia 2.2 any ideas please. Everything else works great.