'15 Tahoe PPV

[guywith2015LT]

Howdy ppl, just found out about this forum and wanted to introduce myself. I recently bought a 2015 Tahoe PPV LT 1500 for a good deal. It has about 82k on it, 4x4 and have some good features.

Being a PPV it has some flaws like no sound (chime, radio, horn) and the 12v outlet, household outlet not working. I am not sure if this is the right place but would love to get some help to get this thing working like a normal car. It also had a dead battery and I replaced it but the earlier problem still persist.

I have checked the fuse for horn located under the hood and it seemed fine, on the driver side there is another fuse panel and it don't really have any fuse relating to the issues I have (I just read the labels and decided on this). If anyone have any experience or can help me out I would really appreciate it.

Hope to hear from you guys.

Thanks for reading

 

[Miami-Dade]

Welcome from Miami Beach&NYC!

 

[guywith2015LT]

forgot to mention, the rear door panels were removed, window switch and the speakers as well. I connected the rear window switches and they don't roll but I can control them from driver seat. If someone knows how to tackle my issues I would really appreciate it. I'll post some pictures after taking it to a car wash.

 

[Chickensandwich]

Howdy ppl, just found out about this forum and wanted to introduce myself. I recently bought a 2015 Tahoe PPV LT 1500 for a good deal. It has about 82k on it, 4x4 and have some good features.

Being a PPV it has some flaws like no sound (chime, radio, horn) and the 12v outlet, household outlet not working. I am not sure if this is the right place but would love to get some help to get this thing working like a normal car. It also had a dead battery and I replaced it but the earlier problem still persist.

I have checked the fuse for horn located under the hood and it seemed fine, on the driver side there is another fuse panel and it don't really have any fuse relating to the issues I have (I just read the labels and decided on this). If anyone have any experience or can help me out I would really appreciate it.

Hope to hear from you guys.

Thanks for reading

No radio? I’ve heard of horns being disconnected, and the chime…well, i would love to get rid the chime. The rear doors likely had flat panels over them. It might get a little pricey getting everything back together, but it’s the journey, not the price, right?

 

[guywith2015LT]

No radio? I’ve heard of horns being disconnected, and the chime…well, i would love to get rid the chime. The rear doors likely had flat panels over them. It might get a little pricey getting everything back together, but it’s the journey, not the price, right?

So they just cut off horns? any clue as to where to start to fix this issue (maybe I can fix it myself if its just connecting wires back)? I live in Chicago and use horn at least once a day.

I don't really care about the chime (kinda miss it because of my other car habit) but the important issue is radio. Its completely mute and I hate driving by myself or the fam with no music playing. The auto drl, no audio, DC 12V and regular outlet don't work so I thought this must be a small issue and they must be connected but seems not.

I have most of the parts, the seller included everything since it was from a PD. I really want to get the back doors to work from inside and get the electrical figured out.

I thought there would be bunch of forums/YT videos about PPV issues and I could fix it myself but didn't find much help expect here.

 

[Chickensandwich]

With my last car, I just added an air horn. I didn’t want to tear in to the dash to find where they cut it

 

[Hoeston]

Drl likely was deleted from factory.
Check the 12v accessory outlet fuse. While you're at it check them all(both fuse panel boxes)with a tester. I had read what seemed like a good explanation of finding the horn wire somewhere. Pretty sure it was this forum if you search around you may find a guide.

 

[guywith2015LT]

thanks for the replies.

Drl likely was deleted from factory.
Check the 12v accessory outlet fuse. While you're at it check them all(both fuse panel boxes)with a tester. I had read what seemed like a good explanation of finding the horn wire somewhere. Pretty sure it was this forum if you search around you may find a guide.

With my last car, I just added an air horn. I didn’t want to tear in to the dash to find where they cut it

So I checked the fuse box on the passenger side and played around with the fuse pulling out and pushing back in and the speakers started to work. All I am left with no is the horn and window control from rear seats.

Air horn seems a good option but I would still have to find the wire from the original horn and connect to it tho? Wouldn't I be better off just fixing the original horn?

The only problems I have so far is outlets not working, horn and rear passenger window control from rear doors. Everything works besides that.

I am tryna get this big bertha to be used as a family car and it's coming along nice. Recently, removed the spotlights and fixed the holes in the a pillar with some black silicone (I don't want to spend tons of money at the body shop for now and silicone seemed the best option for time being use). Will upload some pics after a clean wash soon.

 

[2015TahoePPV]

The rear windows need to be programmed (BCM) to work. You need to go to the dealer, they call the software people somewhere, they burn a program for your BCM that turns the windows on in the back, the dealer installs the software and they will work. (so I was told, I haven't done it yet, but its like $150).

The horn is a fun one that I fixed. There's a circuit in the upfitter harness that loops back on itself that completes the horn circuit. Its designed so the cops can toggle a switch and have the "regular" horn or the "I'm serious get out of the way" horn or siren. When they decomission the trucks, they sometimes just leave the wires cut.

 

[guywith2015LT]

The rear windows need to be programmed (BCM) to work. You need to go to the dealer, they call the software people somewhere, they burn a program for your BCM that turns the windows on in the back, the dealer installs the software and they will work. (so I was told, I haven't done it yet, but its like $150).

The horn is a fun one that I fixed. There's a circuit in the upfitter harness that loops back on itself that completes the horn circuit. Its designed so the cops can toggle a switch and have the "regular" horn or the "I'm serious get out of the way" horn or siren. When they decomission the trucks, they sometimes just leave the wires cut.

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.

 

[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.