The problem with the heating of the seats may be due to the closure of the relays installed under the seat and responsible for the operation of the Peugeot 207 heating system. In this case, the heating of the seat may not work, nor can it be permanently operated unless the seat is deactivated or the fuse is removed. Original rel number 8906GR. But, given the high cost, it is useful to check the health of the old one before replacing it. The details can also be found on auto reviews.
If the heating of one of the seats is broken, it is worth checking whether it works on the other. If not, the problem can be in the burned-out system fuse: slot G40, denomination-20A.