Can someone tell me please :

Does my 2008 Mk2 1.9 tdi sport have a 

"comfort pack" ecu, and if so, where is it located?. The Haynes manual makes one reference to a built-in systems interface, but when I turn to the section that I'm guided to, it's about a different electrical part. 

I have a couple of issues : 

My front electric windows died one by one, then one frosty morning last week my seat belt warning stayed on and beeping for my whole journey to work. And now the front passenger side door locks are only working intermittently: I'm wondering if some damp might have got into the ecu, as the fuses seem intact. 

Your electric windows are independent of any central control, only communicating between themselves (drivers and passenger side modules).

On mk2 Fabias the most likely failure is wire breakage in the rubber bellows between front doors and A-pillars. If you've not checked both of those yet, that should be your first step.

Does the car have radio remote central locking or only 'key in door' version? If the latter, a problem with window motor module on driver's side can affect central locking too.

 

No idea about seatbelt warning.

49 minutes ago, Favorit Fan said:

Does my 2008 Mk2 1.9 tdi sport have a 

"comfort pack" ecu

Yes.

 

I think your issues are nothing to do with it though:-

Windows - As @Pete_Ex-Wino says, they're much more likely to be a broken wire in the door bellows. Check these wires with a multimeter, not a mk1 eyeball.

Seat belt - No promises, but try cleaning the driver's belt catch, and check the wires to it with a multimeter.

Thanks guys I'll check those wires one evening this week. 

My car has a remote fob for the central locking, and I changed the fob battery back in December.