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Bumping this one up for a solution as I am experiencing similar symptoms. I removed a Pioneer system from my 05 Scenic and refitted the factory stereo.
Every time the iginition is switched off and restarted the stereo requires that I input the code. The trip computer and clock also reset themselves.
I've been over the area and there are no loose wires or connectors.
What I did find was that the stereo power ISO connector is providing +12v through two wires when the ignition is on (power/memory) but when off, both wires cut power - whereas one should be permanent +12v?
Any help would be greatly appreciated.
Currently in mr.brown's garage:
2008 C4 Grand Picasso VTR+ 1.6HDi