It's really easy to undo the lower dash panels..
Open drivers door. U need to yank out the black panel which
covers the fuse box, not just the fuse box lid, but the complete side
of the dash!
Don't worry, it's only clipped in. It can't break - I promise!
Stick you head under the steering wheel, and u will see maybe 3 or 4
torx screws holding panels in. Undo these.
This will allow the lower dash panels to come off.
Then you might need to undo a few more panels to allow you to get under the steering column area so u can do your wiring.
Again it's just a matter of undoing all the torx screws, there
must be around 12 in total. (this is why an electric screwdriver
saves so much time!)
Once you've done this, you can easily run the cable along the bottom of
the dash, along the centre console, then into the ashtray for your
button.
Personally I haven't got a switch fitted on mine.. I've hard wired it to come on/off with the ignition.
However the airhorn went off for the very first time (in two years)
this week, so I'm gonna be mounting a switch underneath the
steering column somewhere.
