Hi Ian
I have them on my 2012 XF Portfolio. Exerts from handbook.
DRIVING POSITION MEMORY 1. Memory presets. 2. Memory set button. Once you have adjusted the driver's seat, steering column (see 22, ADJUSTING THE STEERING WHEEL ) and exterior mirrors (see 44, EXTERIOR MIRRORS ), the vehicle can memorise these settings using the driver memory buttons. Once the passenger seat has been adjusted as desired, these settings can be memorised using the passenger memory buttons. 1. Press the memory set button to activate the memory function. 2. Press one of the preset buttons within 5 seconds to memorise the current settings. For the driver’s settings, MEMORY 1 (or 2) SETTINGS SAVED will be displayed on the message centre accompanied by an audible chime to confirm the settings have been memorised. A seat position can only be memorised during the five second period. Any existing settings for a memory preset will be over-written when programming a memory position.
RECALLING A MEMORISED POSITION Press the appropriate memory preset button (for the driver’s settings, MEMORY 1 (or 2) SETTINGS RECALLED will be displayed in the message centre). SITTING IN THE CORRECT POSITION The driver and front passenger must not ride with the seat fully reclined. Do not adjust the seat while the vehicle is moving. The seat, head restraint, seat belt and airbags, all contribute to the protection of the user. Correct use of these components will give you greater protection, therefore you should observe the following points: 1. Sit in an upright position with the base of your spine as far back as possible and the seat back reclined no more than 30 degrees