I ran into this problem on my 560SEL. It turned out to be a broken seat spring had cut into the wire bundle under the seat. I pulled out the seat, repaired the spring with a small piece of steel pipe, and spliced and insulated the damaged wires. Fixed it.

__________________
-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition