I agree with you guys.
I am now on my 3rd Scenic and each one has had a pitiful horn.
The pre 03 shape scenic was easy. It was located front nearside engine compartment near the front.
Just got a New shape one and had a quick look tonight as to how to change the horn over. It's a bit of a project I think. The horn appears to be 'hidden' in the same place as the older models but is inaccessible due to the under engine guard which is pop riveted to the bottom of the front bumper.
Not a quick job this one.
I am going to have a concerted attack at it this weekend - set aside a whole afternoon. It will need the front of the car jacking right up to enable access and quite a bit of messing about me thinks.
I will let you know how I get on.
Any tips or tricks from those in the know would be handy before the 12th May !