From the wiring diagram, I can't find any 3 terminal connector relating to the seats that has those colours. Closest I can see is Blue/Green, Blue/Black and Black, which is for the passenger seat side airbag.
The diagrams only show the wiring colours from the main wiring loom up to the component connectors. The colours from the component to it's connector are not shown because they assume nobody is going to be daft enough to cut the connectors off.
If your cut wires are connected directly to components within the seats, then there's no way to tell where they should go other than getting an auto electrician to check it for you (could be expensive), trial and error (could be dangerous and expensive), or comparing it with another car of the exact same age and specification.