Dear Gilly:
I am very impressed how you delved into this question on the radio coding. I wish I had you as my personal mechanic.
Anyway.... I wrote to the technical division at MBNA and asked specifically if each radio is assigned to a specific key(s) or chassis. It seems obvious from what you are getting to in your analysis, that the radios are interchangable within Mercedes autos without any theft protection. Maybe Mercedes pronouncements of a chip in the key to a specific radio are a little misleading. I will let you know if I get a straight answer. RSL007

__________________
RSL007
1999 ML430
2001 C320 Sport
2000 SAAB 9-5
1998 E300DT
1998 C280sport
1991 300D
1991 350SDL
1982 300DT
1972 Porsche 911 Targa