Discussion
How easily accessible is it?
Dunno about Toyota specifically, but horn upgrades are a really common mod on motorbikes. The Stebel Magnum is a common choice as it's relatively low current so can usually be used with the existing wiring, so I'd check online what current the horn circuit can manage. This is assuming it's on a standard 12V switch and not some funky CANBUS thing (the Yaris will be CANBUS but I'm assuming there's a CANBUS operated relay that gives 12V to the existing horn).
The Magnum is plenty loud enough for me, but if you want louder it's big brother the Nautilus is a two tone but uses more power. You need to use an automotive relay with it, easy to do, the relay just needs a constant 12V supply (might be tricky to find on a CANBUS car?), and earth, and a switching signal (the original horn wiring).
Dunno about Toyota specifically, but horn upgrades are a really common mod on motorbikes. The Stebel Magnum is a common choice as it's relatively low current so can usually be used with the existing wiring, so I'd check online what current the horn circuit can manage. This is assuming it's on a standard 12V switch and not some funky CANBUS thing (the Yaris will be CANBUS but I'm assuming there's a CANBUS operated relay that gives 12V to the existing horn).
The Magnum is plenty loud enough for me, but if you want louder it's big brother the Nautilus is a two tone but uses more power. You need to use an automotive relay with it, easy to do, the relay just needs a constant 12V supply (might be tricky to find on a CANBUS car?), and earth, and a switching signal (the original horn wiring).
Toyota premium horn 08522-44010.
I put in a par of PIAA of the same type and mounted them on top of the radiator panel. I wanted to stick them down in front of the radiator in the original spot (along with bracket to suit) but I didn't have metal to make a bracket. Anyway, after about three years one of them stopped working so got the Toyota premiums but the PIAA's came back into life after some jiggling of the plugs. The difference between the Toyota and the PIAA is that the Toyota plugs straight into the OE plug (postive only - earth through the mounting bolts) and the PIAA's I had to build a little loom for as they have positive and negative connectors. So I'd be inclined to get the Toyota Premiums if starting from scratch again....
Now that I've got two pairs of loud horns I'm thinking of having both on and wiring to the battery via a relay
I put in a par of PIAA of the same type and mounted them on top of the radiator panel. I wanted to stick them down in front of the radiator in the original spot (along with bracket to suit) but I didn't have metal to make a bracket. Anyway, after about three years one of them stopped working so got the Toyota premiums but the PIAA's came back into life after some jiggling of the plugs. The difference between the Toyota and the PIAA is that the Toyota plugs straight into the OE plug (postive only - earth through the mounting bolts) and the PIAA's I had to build a little loom for as they have positive and negative connectors. So I'd be inclined to get the Toyota Premiums if starting from scratch again....
Now that I've got two pairs of loud horns I'm thinking of having both on and wiring to the battery via a relay

I did mine myself as I was so embarrassed by the Yaris horn.
Original horn still in place, just used the lead from it for the new horns. No need to remove the bumper. New horns easily removed and put back to the original if required.
Lots of information on the GR forums.

Edited to add that mine are the PIAA Dual-Tone slender horn kit from Tegiwa.
Original horn still in place, just used the lead from it for the new horns. No need to remove the bumper. New horns easily removed and put back to the original if required.
Lots of information on the GR forums.
Edited to add that mine are the PIAA Dual-Tone slender horn kit from Tegiwa.
Edited by Phil. on Thursday 7th May 10:29
Phil. said:
I did mine myself as I was so embarrassed by the Yaris horn.
Original horn still in place, just used the lead from it for the new horns. No need to remove the bumper. New horns easily removed and put back to the original if required.
Lots of information on the GR forums.

Edited to add that mine are the PIAA Dual-Tone slender horn kit from Tegiwa.
Thats good to know, last time I looked people were taking the bumper off! Original horn still in place, just used the lead from it for the new horns. No need to remove the bumper. New horns easily removed and put back to the original if required.
Lots of information on the GR forums.
Edited to add that mine are the PIAA Dual-Tone slender horn kit from Tegiwa.
Edited by Phil. on Thursday 7th May 10:29
Thanks.
rodericb said:
Toyota premium horn 08522-44010.
I put in a par of PIAA of the same type and mounted them on top of the radiator panel. I wanted to stick them down in front of the radiator in the original spot (along with bracket to suit) but I didn't have metal to make a bracket. Anyway, after about three years one of them stopped working so got the Toyota premiums but the PIAA's came back into life after some jiggling of the plugs. The difference between the Toyota and the PIAA is that the Toyota plugs straight into the OE plug (postive only - earth through the mounting bolts) and the PIAA's I had to build a little loom for as they have positive and negative connectors. So I'd be inclined to get the Toyota Premiums if starting from scratch again....
Now that I've got two pairs of loud horns I'm thinking of having both on and wiring to the battery via a relay
You can get a loom pre-made.I put in a par of PIAA of the same type and mounted them on top of the radiator panel. I wanted to stick them down in front of the radiator in the original spot (along with bracket to suit) but I didn't have metal to make a bracket. Anyway, after about three years one of them stopped working so got the Toyota premiums but the PIAA's came back into life after some jiggling of the plugs. The difference between the Toyota and the PIAA is that the Toyota plugs straight into the OE plug (postive only - earth through the mounting bolts) and the PIAA's I had to build a little loom for as they have positive and negative connectors. So I'd be inclined to get the Toyota Premiums if starting from scratch again....
Now that I've got two pairs of loud horns I'm thinking of having both on and wiring to the battery via a relay

https://www.amazon.com/dp/B09919WRV5
jimmyjimjim said:
rodericb said:
Toyota premium horn 08522-44010.
I put in a par of PIAA of the same type and mounted them on top of the radiator panel. I wanted to stick them down in front of the radiator in the original spot (along with bracket to suit) but I didn't have metal to make a bracket. Anyway, after about three years one of them stopped working so got the Toyota premiums but the PIAA's came back into life after some jiggling of the plugs. The difference between the Toyota and the PIAA is that the Toyota plugs straight into the OE plug (postive only - earth through the mounting bolts) and the PIAA's I had to build a little loom for as they have positive and negative connectors. So I'd be inclined to get the Toyota Premiums if starting from scratch again....
Now that I've got two pairs of loud horns I'm thinking of having both on and wiring to the battery via a relay
You can get a loom pre-made.I put in a par of PIAA of the same type and mounted them on top of the radiator panel. I wanted to stick them down in front of the radiator in the original spot (along with bracket to suit) but I didn't have metal to make a bracket. Anyway, after about three years one of them stopped working so got the Toyota premiums but the PIAA's came back into life after some jiggling of the plugs. The difference between the Toyota and the PIAA is that the Toyota plugs straight into the OE plug (postive only - earth through the mounting bolts) and the PIAA's I had to build a little loom for as they have positive and negative connectors. So I'd be inclined to get the Toyota Premiums if starting from scratch again....
Now that I've got two pairs of loud horns I'm thinking of having both on and wiring to the battery via a relay

https://www.amazon.com/dp/B09919WRV5
Nicetobenice said:
RSstuff said:
Thanks for all the replies, I was hoping for simple solution without too much cost or dismantling though.
The solution that is both the most simple and least cost is just not to care.Can't really think of a reason a really loud horn is required.
RSstuff said:
Phil. said:
Check out my post above. A simple solution with no dismantling and the only cost was the new horns and a bit of wire/few connectors.
I can only see one new horn in your pic, am I missing something?Various horn upgrade options and more info here:
https://www.gr-yaris.co.uk/threads/the-horn-upgrad...
Horn kit here:
https://www.tegiwa.com/products/piaa-dual-tone-sle...
Without doing it for you I can t help much more

Edited to say, mine have been on for nearly 3 years without any problems. Not used very much do make a big difference when needed.
Edited by Phil. on Saturday 9th May 11:44
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