Makes a pretty good case for a simple switch and a lamp, eh?

Somehow, someone decided that computer controlled everything was cheaper than wires and switchs, in spite of the fact that the wire and switch is still there, and a computer in the tail light to switch the bulb on and a high speed serial cable cost a whole lot more than a switch and a wire.....

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

Yep, the system as described in the 1996 schematic makes sense... the 1997 system looks overly complicated just to tell you the coolant is low... there must be a reason, but not apparent to me.
Anyway, sorry this process took so long, but lots of knowledge gained... will have to check my '96 and see how its wired... :-)
Glad information helped.

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KenP

1996 S500 W140 Coupe