I have an 06 911 c4s and recently I accidentally left my headlights on and it killed my battery. I changed my battery to start the car and put the old battery back in everything works fine I just don’t have any heated seats. Seat button lights on both sides will not light up or do anything. I checked my fuses in the panel on driver side footwell their time all good is there another fuse box location????

 

Try and disconnect the battery for 10 minutes, then reconnect it. If that doesn't work, you'll have to visit the dealer to have them do a handover where with PIWIS they tell the car what options it has so they work again.

 

Ok I was hoping not to have to go to the dealer we only have one here in Richmond and they have no knowledge of the hand over being done because of died battery. I wonder who else has the computer to do the handover besides the dealer???