I have taken the scuttle tray off many times. The relay sounds like its in the car. I have a different problem. When I turn the wipers on, be it intermittent, one wiper, etc and then back to off.... They dont ****** turn off!!! You don't realise how annoying it is! Eventually they stop though.
If I have the wipers arms off and turn them on and off again, they stay on constantly. and I can hear, from inside the car, the relay clicking.
Now, I shall tell you how to take them off:
1. Open up the bonnet and undo the black caps with a little screwdriver, pull off the long rubber strip that clips it onto the bulkhead, then unclip the black plasticcover that was underneath it (on the passenger side, can't miss it).
2. Undo each wiper arm with a 13mm spanner.
3. Now, you need 21mm (for drivers side) and a 22mm (passenger side) open ended spanner. A 22mm might work for both actually. And jimmy the arm off by putting some pressure on the spline. Sorry no pic to describe.
First time doing might be a tad hard but have patience.
4. Now the scuttle will come away, just give it a little tug from the windscreen (just lightly clipped in all the way along). There will be two electrical connectors and the washer pipe to undo before completely removing it though.
5. You will now see the wiper linkage. Just 3 10mm nuts to remove and of course the eletrical connector.
... On refit do NOT over tighten the nuts on the wiper arms or they WILL break!!....
Hopefully this will help, if not message me.