The seat adjuster switch is very failure prone, and should be the first item to check AND clean internally, followed by continuity between the door and the seat. Do any of the other directions work? Yes to the manual adjustment, you almost need the seat out of the car, this presuming the you have a power problem as I believe. You can jumper the motor at the connector and drive it back to a more usable setting.

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Mark
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THE WHITE FLEET
2016 GLE300d 4-MATIC 38K BROWN!
2012 S350 Bluetec==94k WHITE

2007 ML320 CDI==166K WHITE (FOR SALE)

Under new management:
2005 E320 CDI--140K--WHITE
1995 E300-Diesel-133.5K--THE CAR IS BLUE
1986 300SL--97.5K (European) AND WHITE. Back in Europe!
1991 190E 2.3-73K California Perfect.--WHITE
1995 E320-Wagon-159K--WHITE (recently scrapped)
1987 300D Turbo-213K--WHITE
1987 190D 2.5 Turbo-288K--WHITE