If you have access to 12 volts, remove the wiring and hook 12 volts up to two wires, if no movement, move one wire to another pin. If no movement move wire to another pin. When you get movement if wrong direction switch wires.

On earlier W126's there is a box under the passenger seat that has a bunch of relays for the seat motors, not sure about the later versions. It could be that one of the relays is stuck, or connectors corroded.

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