Does anyone know how to sync the motor on a W124 sunroof.?

My sunroof does not close in the vent position even though I hear the motor run, and it opens when you put in the key and close the windows (key all the way to the lock position and held).

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Norm K.
'97 E420 Sport
'06 E350 Sedan
'67 Mustang Coupe
'70 F-250
'15 VW Jetta