Aux Heater (Webasto) not recogniced i VCDS

Hey.

Have an 1997 D2 4.2 Quattro fitted with the vinter package, and the Webasto heater. The Controlls in the door rest seams to work, but nothing is happening to the Webasto heater itself. Connected the VCDS, and it says that no Controll for Aux heater can be found.

Where to start looking for fault?

Regards Kay