With 2-zone climate:
Tap repeatedly on the physical buttons for the heated seats on the left and right-hand side at the rear of the tunnel console in order to switch the seat heating on/off and toggle between the three heating levels.
The level changes and the LEDs in the button show the set level.
Warning
Heated seats must not be used by people who find it difficult to perceive an increase in temperature due to a lack of sensation or who otherwise have problems operating the controls for the heated seats.