Is your window already open now? Perhaps the switch doesn't give contact....
The problem with the seat heating is "normal". Many Xedos drivers have the same problem, including myself. It seems to be a broken heating wire in the seat, but nobody knows it exactly. Funny: my seat takes nearly 6A which is the correct power. But it keeps cold
Your problem with the rear light is dubious. This is no "really modern" car with a data bus system which makes a lot of trouble like VW or Mercedes models, so this is a problem which could not be
Gruß,
Christian