There are 2 horns on a Cayenne, both are located behind the outer front bumper air ducts. I never changed one but the factory way is to remove the headlights/front facial. From pictures I have seen, it looks like they might be accessible by removing the inner fender-wells if you have long arms and don't mine scratches/scraps. It would save you about 2hrs. of work.
it is in the steering wheel or you may need to take the speed meter to access the horn
Carry a circus clown in the passenger seat and ask him to honk his horn as required
Replace the Airbag/horn bracket in the steering wheel, rubber bushings are worn out,
Horn Again was created in 2009.
Trader Horn The Journey Back - 2009 was released on: USA: 28 August 2009
how to change out a horn on a 2008 hyundai elantra
The Brow Horn Orchestra was created in 2009.
Horn Ok Please was created on 2009-01-09.
Volker Horn died on November 20, 2009, in Berlin, Germany.
http://electricalandelectronics.org/2009/03/21/horn-gap-arrester/
According to the 2009 Ford Escape Owner Guide : ( # 24 is a 20 amp fuse for the horn relay )
The cast of Horn Dog - 2009 includes: Barnold as Dog Mike Juarez as Dog Greg Sextro as Dog