Sounds like you are pressing it ONCE you are in the car.. This is the way to do it.

Unlock the car, open the door and PRESS your memory button BEFORE you sit in the car.

With mine, if I sit in whilst it`s adjusting in to place, it stops, so you have to set the seat position whilst you are stood waiting to get in to the car.

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X5 3.0D 2003
Mods:
Webasto telestart remote kit
Aluminium running boards
Tv in motion & Aux input lead, Ice>ink to Ipod 3g.
DVD rear headrest screens and dvd sytem integrated in to main tv system via aux lead (watch tv or dvd in front and back)
Homelink Gate Opener, Chrome Grille Kit, chrome tailgate handle, Chrome Guage Rings, Tunit V-CR 086
Standard:
Bluetooth, comms pack, sat nav, sports pack, sports seats, dimming mirror, electric folding mirrors, memory seats, heated seats.