Mercedes USA have put out some electronics diagnostics documents out, and
the page for the Base Module is here;
http://www.startekinfo.com/manual/volumes/cd1/1_1/content.jsp
Have a look at the component location, and try to follow the links in the page with
the error codes.
But, it looks like you have a general problem with power supply to the other modules.
Check the fuses on top of the Base Module.
br,
syljua