Originally Posted by Jeremy5848

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