The driver's power seat on my 1987 300D has one non-working function right now. You can move the seat forward-backward, tilt, headrest up/down but cannot get the rear portion to go up/down. The seat-cushion button will move the front part of the seat up and down, but the rear portion will not move at all. I can hear the relays clicking under the seat when the switch is operated, but nothing moves. I was checking everything out last night under the seat and kept moving the switch and the seat back did move up slightly, but now is back to clicking again. Any thoughts on this one?

Thanks.

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1960 MB 190Db w/ full sunroof
1985 Toyota Pickup
2006 Honda Odyssey EXL R&N
2001 VW Jetta GLS TDI