You may have a short in the cable that runs from the B-pillar into the left rear door. In the 1980s W124 cars, this is a common problem. The wire used in that era was not sufficiently flexible and gradually break over time. Your S-class may have a similar problem.
To find the broken wires, you must remove the left rear door skin and the left B-pillar cover, disconnect the window wires at the left rear switch, and pull them back into the B-pillar. That is how I found and fixed a similar problem in my '87 300D Turbo. See here for details of that job.
Jeremy
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .343,000 miles Wife's car
2005 E320 CDI . . 148,000 miles My car
Santa Rosa population 177,300 (2026 projected)
Total. . . . . . . . . . . . 668,300
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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