Horn Relay? - Toyota Yaris Forums

MGargano · 06-18-2009, 04:18 PM

I just picked up one of the Trombe Stebel Nautilus horns and just finished the install, except for the relay. Does anyone know if the OEM relay works for this horn, or should I use the one that came with the Nautilus horn? Where is the horn relay if I do need to change it?

marcus · 06-18-2009, 04:34 PM

new relay should be use if ur adding horn but if ur replacing stock horn then stock relay should work..

CTScott · 06-18-2009, 04:55 PM

The OEM horn circuit (fuse, relay and wiring) is able to drive a 10A horn. If your new setup requires more current than that, you will need to add the included relay and use the existing horn circuit to drive the new relay. The OEM horn relay is in the engine compartment fuse panel by the way.

MGargano · 06-18-2009, 07:08 PM

I upgraded the OEM 10amp fuse to a 15amp fuse, as per the Nautilus DIY and everything seems to be working perfectly. I couldn't seem to find the horn relay in the under-hood fuse block, but it seems like I might not need it?

Tamago · 06-18-2009, 07:11 PM

guess we'll see ;)

i always recommend a relay in this situation. is the "nautilus" horn an air horn?

CTScott · 06-18-2009, 08:14 PM

Now I see why you can't find the relay - It's part of the "integration relay", which is the chunk of plastic that the horn fuse in mounted in.

In that case, I'd really be tempted to install an external relay to run the new horn. If you cook the OEM "integration relay" module you'll probably be looking at a few bucks to replace it.

kierf · 11-14-2009, 02:54 PM

How does one go about adding an external relay? I have a set of air horns, and it is strongly recommended I use the external relay. Previous installs I've done have been on older cars and had a seperate horn relay.

CTScott · 11-14-2009, 06:01 PM

Quote:

Originally Posted by kierf

How does one go about adding an external relay? I have a set of air horns, and it is strongly recommended I use the external relay. Previous installs I've done have been on older cars and had a seperate horn relay.

Take the feed to the existing horn and use it to feed the coil of the new horn relay (the existing horn is a one wire device, so that wire goes to one side of the relay coil and the other goes to a ground point).

Then, feed the new horn via the relay contacts (normally open). Connect an appropriately sized in-line fuse to the + terminal of the battery and from there to the common contact of the relay. Connect the normally open contact of the relay to the + wire for your new horn, and connect the - wire for your new horn to ground.

06-18-2009, 04:18 PM	#1
MGargano Drives: 2009 Yaris Hatchback Join Date: Feb 2009 Location: NJ Posts: 792	Horn Relay? I just picked up one of the Trombe Stebel Nautilus horns and just finished the install, except for the relay. Does anyone know if the OEM relay works for this horn, or should I use the one that came with the Nautilus horn? Where is the horn relay if I do need to change it?

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06-18-2009, 04:34 PM	#2
marcus toyota View User's Garage Drives: 2007 Yaris RS Blazed Join Date: Oct 2006 Location: toronto, canada Posts: 3,637	new relay should be use if ur adding horn but if ur replacing stock horn then stock relay should work..

06-18-2009, 04:55 PM	#3
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	The OEM horn circuit (fuse, relay and wiring) is able to drive a 10A horn. If your new setup requires more current than that, you will need to add the included relay and use the existing horn circuit to drive the new relay. The OEM horn relay is in the engine compartment fuse panel by the way.

06-18-2009, 07:08 PM	#4
MGargano Drives: 2009 Yaris Hatchback Join Date: Feb 2009 Location: NJ Posts: 792	I upgraded the OEM 10amp fuse to a 15amp fuse, as per the Nautilus DIY and everything seems to be working perfectly. I couldn't seem to find the horn relay in the under-hood fuse block, but it seems like I might not need it?

06-18-2009, 08:14 PM	#6
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	Now I see why you can't find the relay - It's part of the "integration relay", which is the chunk of plastic that the horn fuse in mounted in. In that case, I'd really be tempted to install an external relay to run the new horn. If you cook the OEM "integration relay" module you'll probably be looking at a few bucks to replace it.

11-14-2009, 02:54 PM	#7
kierf Drives: 2008 Yaris Hatchback Join Date: Nov 2009 Location: Vegas, w00! Posts: 2	How does one go about adding an external relay? I have a set of air horns, and it is strongly recommended I use the external relay. Previous installs I've done have been on older cars and had a seperate horn relay.