Hello.
I have this problem too. Blows a fuse every few weeks.
In my case, the problem is caused by a malfunctioning headlamp wiper
motor. (These fire up for a couple of wipes when you use the
windscreen washers.) One of my headlamp wipers is partly seized and
very slow to move. I have tried all sorts of remedies like penetrating
oil, but I really need to replace it. I am yet to find out how to
remove the headlamp wiper motor though. It is not like the early V70.
There was an easy trick to removing them without removing much else!

Keep putting the fuses in. I seem to recall it's a 16A too. It's not a
very common size.......  Don' put anything bigger in though. You'll
just fry more of your electrical system and then it'll cost big bucks!
New loom sections and all sorts!
Quick-fix would be to disconnect the wiring to the headlamp wipers,
but I haven't located the plug yet either.

If you don't have headlamp wipers, then your washer pump is probably
on the way out. You have to remove the front bumper to replace this.
It's no big deal. Just 2 bolts behind the bumper rub-strips and two
clamp screws in the wheel-arch area (1 each side). The wash pump
pushes unto a big rubber grommet in the side of the reservoir. Very
easy to 'plug' a new one in.

Have fun!

Regards.
Joe.
Peterborough UK.
P.S My e-mail address is completely void to avoid spam. Don't try to E-
mail me direct!