Seat heating delayed

Now it is gradually becoming uncomfortable and the seat heating is often used. I notice that it only starts to heat after several kilometers. It seems as if a time delay (priority) is in the connection. Specifically it is about 2 V70 II from the final edition of 2007. Can someone say something about this ? I am aware that there are also higher heating levels for the Nordic countries which can be programmed at :-). But it is explicitly about whether d he seat heating can not be switched immediately according to software. Thank you ! Jan