You will be surprised...

My bet is still the harness (but could also be the NSS)...

I am talking about the harness that attaches to the ETA...

And I would check the codes, they will point you in a direction, no dealer necessary...search and you will find all the information you will need.

http://www.peachparts.com/shopforum/showthread.php?t=280952

JimF website:

http://www.k6jrf.com/MB_S500.html

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1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
609 Certified