Horn

Japan Toyota sells upgrade PIAA horns, they were not available here when I enquired some years ago. It's an easy upgrade though. Remove the plastic tray above the radiator, you should have enough room to fit additional horns. There is a horn relay so uprating the horn to FIAMM electric would be easy and there are plenty of spare threaded holes round the radiator which are suitable to bolt to. Air horns normally take 15 odd amps so I would advise fitting an additional relay. I fitted two additional FIAMM AM80s to the original horns in the Prius, just adding a doubling spade terminal and an earth is the easiest way and uprate the fuse to 20 amps. The original horn is 2.4 amp the FIAMM's are 4 amps each. Most large European cars use these, they are the best after an Air Horn.
Tip if you cannot get the plastic plugs back in the holes because the four lugs have expanded, gently heat them with an heat gun they close back up. Use too much heat and you end up with plastic glue.
I'm doing this upgrade next week after I have the software upgrade done by the garage.
If you wait I'll post pictures and details.
These are the clips, use a thin blade to pop them up, then lift out.
Clips after a bit of heat.
Original Horn doubled up with a FIAMM, bracket trial fit.

I've got these to fit - be really interesting to see your horn retrofit once you carry it out.

Would need a bit of a clean up & I need to make a short loom as they have a 2 pin connector plug.

Don't see why they wouldn't be as good as any other new ones. I would think better than PIAA. I just compared my remaining PIAA and it was not as loud as my FIAMM AM80 and it takes 3.25amp the Bosch and FIAMM take 4 amp. You probably could fit them all, that would be much much louder than the MeepMeep from the factory ones.
I've got a Stebel Nautilus truck horn nice deep note that I used to have on my bike with a set of Klaxcar (French) horns £9 as good as anything available, not available here at the moment. Used to wake up most drivers, lorry driver swore at me, as the police say at least you know you have been
seen.

Surrey C-HR said:

It’s not just the C-HR, my 2019 Corolla touring sport is just the same.

Good news it’s easy to change as you don’t need to remove the bumper.

Click to expand...

Bad news I read this as applying to the CHR. No it's not easy on the CHR.
Took the panel off above the radiator and you have a plastic panel shielding everything below it. After a lot of poking and prodding I found the horn, passenger side just in front of the radiator cross member. If you prise up the plastic you can just get to the bolt and if you lasso the horn with some wire (if you drop it there will be a lot of swearing) it looks like the horn wire connector could be long enough to pull up with the horn and get to the connector, not sure about getting it back though as the bolt is fiddly to start back in the thread.
However there are two 6mm threaded holes either side that could easily be adapted to hold FIAMM Bosch or Hella horn type horns.
The plastic panel is held on with 5 plastic pop up clips and two JIS (philips are close, do not use pozi ) screws holding the bonnet rubber/plastic bungs. The panel has small lugs at the front, these go under the plastic front panel with the weather seal strip on.
photos plastic clips and screws rubber/plastic bungs
bolt under plastic cover with foam
screwdriver points to location of horn bolt

When the icy blast has passed I will try adding horns. The next post I will probably be HOW DO YOU REMOVE THE BUMPER 😂 🤣

Is this diagram any help?
Shows the horn & also the pedestrian acoustic warning device.