Drivers window won't go up or down..

[Vince70]

I wonder if someone could give me some advice my drivers window on my Audi Cabriolet has decided only to work once in awhile..

I don't think it's the switch as when I use the switch on the centre console the other 3 windows go up and down and the drivers window still doesn't work and it also doesn't work when using the switch on the drivers door panel.

I just wondered if it could be a relay but the thing is why wouldn't it affect the other 3 windows also I've had a quick look at the relay and it's numbered 343 and not the usual 363 or 367 so could I use the later relay if it was the relay

Also when I press the the electric window button I can hear a click coming from the relay