Its an easy fix, the red and yellow wires need to be swapped. Cut the red and yellow wires from the radio, before the ISO connector and connect red to yellow, and yellow to red, but only from the radio, not the cars wires. The yellow is supposed to be the constant, but on a few cars its not, the red is the constant. This is how I fixed this problem on my Passat. After doing this although the memory held, clock, stations etc. when I power off the radio, there is a constant hiss through the speaker, this happens even when the ignition is switched off, and the immobilizer enabled. I as yet have not found a cure for this, other than buying a half decent unit.
I hope this helps.
Chips
Chips
January 2008