hello smileysport,have just done the quickest head unit change in history,and im sorry to say no!
i have a blaupunkt md 70 head unit and a idc ao9 5 disc changer in glove box.so i quickly took the md70 out and put the (single cd) factory unit back in.
at first it looked good because the plugs are the same (iso-blue) but as soon as i connected up the changer the display vanished from the dash and nothing............absolutly f#*# all(no sound,no control of changer,no display).but as soon as the md70 went back in every thing came back.
sorry,good idea though.grant.