Retrofitting XC60 Heated/Ventilated/Massage Seats Into an XC40?

[Sodertalje]

First, you should explore your cem to see if massage or ventilation is present and can be activated. If not, there is no way to add it to the cem. Then you should measure the mounting points of the rails to see if they fit physically and measure if you can get the seats in. And last, you probably have to rewire A LOT!