Hi, I have a 98 diesel ulysse with a front passenger seat which wont adjust. There is no reaction to operating the switches and no apparent way to find the wires to check them. I am unable to get a mamual and the cd manual of the internet is good but doesn't say anything about the seat electrics.
Anyone got any ideas?

Fuses?

do you have a supply at the underseat connctors? If you do, then the fuses are fine. Check the motor supply next (when operating the switch) if you get a supply there, then the issue lies with the motor.