Hi, I had a similar problem, no central locking and no rear windows, I had a leak in the passenger side footwell which had corroded some of the wiring in the loom, cut some wires back cleaned and solderd them and that sorted the problem. It's worth a look, hope this helps.
Checked all fuses, all OK, checked relay with VW they said part no on relay is from a Corrado auto box (don't know how it ended up in a Galaxy) Ford also say it's wrong, have ordered relay 114 from VW, cheaper than Ford, try that hopefully that will solve the problem. Cheers
Recently bought 1999 2.3 Galaxy Ghia, problem, heater not working, had a look at the wiring diagram which which states relay K28 is heater blower relay, I traced it to relay 150, any idea's would be really helpful.