'15 Tahoe PPV

[guywith2015LT]

I still haven’t figured out the horn. These are all my wires that I found. The thick red wires from diver and passenger side. There is no connection to them in between. I am scared to drive around with no horn, would appreciate some help on how you got it to work.

I found a purple wire by itself that’s been cut and routes back to the steering column connections.

 

[2015TahoePPV]

Do you have one tagged 6J4? If its a single pair of wires (in the same loom) that are cut/ open on the end, then splicing them together should make the horn work. The upfitter manul says that pigtail is in the under dash harness, but mine was in the pigtail between the seats.

This is what I had left when I removed my console, lol:

 

[2015TahoePPV]

It should be a brown wire/ white stripe. The manual shows a connector, but mine was cut already, and yours probably is too

 

[guywith2015LT]

Do you have one tagged 6J4? If its a single pair of wires (in the same loom) that are cut/ open on the end, then splicing them together should make the horn work. The upfitter manul says that pigtail is in the under dash harness, but mine was in the pigtail between the seats.

Thanks for the reply. I found this one under the middle seat. Both are same colored under the wrap. Brown and white lined. Do I just splice them together?

 

[2015TahoePPV]

Thanks for the reply. I found this one under the middle seat. Both are same colored under the wrap. Purple and white lined. Do I just splice them together?

yep, that's it.

 

[guywith2015LT]

Thanks for the reply. I found this one under the middle seat. Both are same colored under the wrap. Purple and white lined. Do I just splice them together?

yep, that's it.

I got so excited man. Spliced them up like this for now but it won’t honk.

 

[2015TahoePPV]

I'd cut it back to the factory wires (get rid of the upfitter splice). One side of that wire should go to ground when you push the horn, the other side should go to the relay in the fuse box under the hood.

I'm not 100% sure on whether its a ground or a 12v signal that energizes that relay. I have all the wiring diagrams at work, I'll check it tomorrow.

If you leave it spliced together, go into the settings menu on the radio and tell it to honk the horn when you lock the truck with the remote. See if it works, if it does, you may have another issue in the circuit coming from the horn switch/ steering column.

 

[guywith2015LT]

I'd cut it back to the factory wires (get rid of the upfitter splice). One side of that wire should go to ground when you push the horn, the other side should go to the relay in the fuse box under the hood.

I'm not 100% sure on whether its a ground or a 12v signal that energizes that relay. I have all the wiring diagrams at work, I'll check it tomorrow.

If you leave it spliced together, go into the settings menu on the radio and tell it to honk the horn when you lock the truck with the remote. See if it works, if it does, you may have another issue in the circuit coming from the horn switch/ steering column.

So I used my multimeter to check if the wires actually work and I tested it using the diode setting. Connected each wire to one end of the multimeter strobes and pressed the honk. It turned zero so that checked out. Replaced the fuse under the engine block. And pressed the horn again, I hear a clicking noise whenever I honk. That’s about it. I changed the settings too and still nothing. I’ll lookout for your message. Thanks again.

 

[2015TahoePPV]

clicking noise means your horn relay is working, so its in the wiring between the fuse box and the horns themselves. You're closing in on it!!

Expose one of the horns and check for 12v getting to that connector. It could have been unplugged, cut, etc by the upfitters, or you could have bad horns.

 

[2015TahoePPV]

The problem with these trucks is that the guys "de-milling" them don't care, so you end up with these issues. They're being paid to remove stuff, not to put the truck back to factory.