JimF has a schematic posted on his website here: (bottom of page)
Fault codes can be found here:
Arthur Dalton also has a rough hand-drawn schematic to build one. Both are very good.
You'll need a solder gun as well.
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi
Last edited by pmizell; 12-07-2002 at 11:38 AM.