'15 Tahoe PPV

[guywith2015LT]

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.

Yea I agree, they don’t care much.

Do you know where the horns are located? Is it by the wheel wells behind the front bumper. The resources for this car is so limited. Usually I find a blueprint of the car after few google searches but it’s quite opposite for this car.

 

[2015TahoePPV]

They're buried between the frame/ front bumper cover. I pulled my cover to remove the siren and about 10lbs of wiring and if I recall they were pretty accessible. The drivers' side one may be accessible from the top if you don't have a second battery.

 

[2015TahoePPV]

here's the block diagram and circuit theory:

 

[guywith2015LT]

here's the block diagram and circuit theory:
View attachment 400069

I removed horns and manually tested them and it honks alright. I don’t know what to do anymore. I guess it’s the wiring from horn to the fuse that needs some work. Any idea/tips how I can fix this. I tried to trace the horn connector and just goes into a big wiring loom which is wrapped.

Update:
I tried to jam the multimeter probes into the horn connector and didn't see any current. I might have to splice (I don't really want to do this) through the wires to make sure there is a proper connection between the multimeter probes and honk to see any positive voltage.

Lets says if there isn't any positive voltage where/how should I tackle this issue?

 

[guywith2015LT]

I also found this in the glove box earlier today, no idea where to find the wiring of it. does anyone know if it's wx7 or 6j3? Would love to have some aux capability. Also I don't have the center console instead a middle seat (probably because it was a K9?), so no idea where this piece gets attached.

the power outlets have started to work automatically lol. Just have to figure out the horn man.

 

[Sparksalot]

I also found this in the glove box earlier today, no idea where to find the wiring of it. does anyone know if it's wx7 or 6j3? Would love to have some aux capability. Also I don't have the center console instead a middle seat (probably because it was a K9?), so no idea where this piece gets attached.

View attachment 400217View attachment 400218

the power outlets have started to work automatically lol. Just have to figure out the horn man.

That would go into the oem center console. Front passenger corner.

 

[guywith2015LT]

That would go into the oem center console. Front passenger corner.

View attachment 400221

thanks for the reply. Since I have the middle seat instead of the full center console there isn't a connection spot for me in my console. Do you happen to know where the wiring connection for that can be found? or at least the wire name?

 

[2015TahoePPV]

I removed horns and manually tested them and it honks alright. I don’t know what to do anymore. I guess it’s the wiring from horn to the fuse that needs some work. Any idea/tips how I can fix this. I tried to trace the horn connector and just goes into a big wiring loom which is wrapped.

Update:
I tried to jam the multimeter probes into the horn connector and didn't see any current. I might have to splice (I don't really want to do this) through the wires to make sure there is a proper connection between the multimeter probes and honk to see any positive voltage.

Lets says if there isn't any positive voltage where/how should I tackle this issue?

If I recall properly, the horn relay is built into the fuse box itself. If the relay is clicking, you've eliminated everything inside the truck and past the fuse, so you'll need to find the brown/ gray wire coming from the fuse box going to the horn and look for a break in it. probe the fuse for power coming from the relay when its activated, then check the continuity from the output of the fuse to the horns. Its probably open from what you described. Look for any signs that they cut a wire, or just run a new one from the output of the fuse to the horns and it should work.

 

[2015TahoePPV]

I also found this in the glove box earlier today, no idea where to find the wiring of it. does anyone know if it's wx7 or 6j3? Would love to have some aux capability. Also I don't have the center console instead a middle seat (probably because it was a K9?), so no idea where this piece gets attached.

View attachment 400217View attachment 400218

the power outlets have started to work automatically lol. Just have to figure out the horn man.

The jump seat has provisions under the lid on mine: I had to run the wires up through the console when I reinstalled it (it was included with the truck, but loose in the back when I got it. There's a video on Youtube from Phil Gamboa (harness Dr.) for routing the wires.

 

[guywith2015LT]

Still working on the horn .

@2015TahoePPV do you happen to know if there is an easier way to track the horn wire to the fuse box? I am new to car wiring stuff, so don't want to mess up if there is a same brown/white looking wire.

Not to mention, I am a young dude with just enthusiasm to learn about cars. I did some additional testing today by pressing the horn and checking the 93 fuse for power and got strong 12.54V. So there must a disconnection from the fuse box to the horn. If I have to tear up the wire bundle I would rather run a new wire and splice it into the old wiring. However, I don't know where the horn wire meets to the fuse box. I hope my wording is not confusing.

 

[guywith2015LT]

SUCCESS!!!

It's 12:30am out here and my eagerness to fix the horn finally made it work. I followed @2015TahoePPV advice, and gave one last chance in tracing the wire, lo and behold found few open ended wire near the fuse box.

First did a voltage check to find the horn wire and then did a continuity check from the horn plug to the open ended wire found in the loom near fuse box. Found the connection, used butt connector to make a connection and finally got it to work. Wish I had some heat shrink to wrap this up but used an electrical tape and got this to work. I don't know how to upload a video here but it finally works. I might make a YT video about this because there is literally no resources there.

Thanks again, I'll try to fix the aux connection moving forward.

 

[2015TahoePPV]

SUCCESS!!!

It's 12:30am out here and my eagerness to fix the horn finally made it work. I followed @2015TahoePPV advice, and gave one last chance in tracing the wire, lo and behold found few open ended wire near the fuse box.

First did a voltage check to find the horn wire and then did a continuity check from the horn plug to the open ended wire found in the loom near fuse box. Found the connection, used butt connector to make a connection and finally got it to work. Wish I had some heat shrink to wrap this up but used an electrical tape and got this to work. I don't know how to upload a video here but it finally works. I might make a YT video about this because there is literally no resources there.

Thanks again, I'll try to fix the aux connection moving forward.

Awesome! Glad you found it, I understand how frustrating this stuff is.

 

[guywith2015LT]

I have a weird new issue, after driving the ‘hoe for a while I have my reverse light turned on all the time. They stay on even after turning the car off.

I was able to turn them off by smacking the fuse box few times (just like the old TV ). I would like to know if someone had the same issue and if there is a way to fix it. There are no fuse for the reverse light from the manual. Would really appreciate it if someone can help.

I am planning to go on my first camping trip with this beast and want to fix all the issues.

I also learned that it has AFM and how I might be in trouble if I don’t turn it off. If anyone know any good resources to switch it off I would be grateful. I know I have to buy like a module that’s pretty expensive but if anyone know any cheaper and easier way that would be nice.

 

[Sparksalot]

I have a weird new issue, after driving the ‘hoe for a while I have my reverse light turned on all the time. They stay on even after turning the car off.

I was able to turn them off by smacking the fuse box few times (just like the old TV ). I would like to know if someone had the same issue and if there is a way to fix it. There are no fuse for the reverse light from the manual. Would really appreciate it if someone can help.

I am planning to go on my first camping trip with this beast and want to fix all the issues.

I also learned that it has AFM and how I might be in trouble if I don’t turn it off. If anyone know any good resources to switch it off I would be grateful. I know I have to buy like a module that’s pretty expensive but if anyone know any cheaper and easier way that would be nice.

I had the same issue with my 2011 PPV. The reverse relay had failed. In the gmt900 that relay is hardwired into the main fuse panel. I swapped the entire thing out to repair it.

 

[newcomer]

I have a weird new issue, after driving the ‘hoe for a while I have my reverse light turned on all the time. They stay on even after turning the car off.

I was able to turn them off by smacking the fuse box few times (just like the old TV ). I would like to know if someone had the same issue and if there is a way to fix it. There are no fuse for the reverse light from the manual. Would really appreciate it if someone can help.

I am planning to go on my first camping trip with this beast and want to fix all the issues.

I also learned that it has AFM and how I might be in trouble if I don’t turn it off. If anyone know any good resources to switch it off I would be grateful. I know I have to buy like a module that’s pretty expensive but if anyone know any cheaper and easier way that would be nice.

Did you manage to fix the rear windows?

 

[guywith2015LT]

Did you manage to fix the rear windows?

nope , the family hates that I have the controls to it.

 

[guywith2015LT]

Just wanted to reach out the great people here for some help. So, I had a small impact on the driver side front fender and to fix the dents people up in chicago are asking for 1000$+ so I ended up ordering a replacement part but it came just primed and no color.

Went to o'Reillys, they gave me a duplicolor can. Came home and sprayed it out really nice in the garage. After it dried up I realized it has metallic in it . I have a U8555 which is just black. O'reillys don't really give a shit about this because I gave them my color code and they said this will work out.

Anyways, I am willing to sand, prime and repaint it but I can't find the actual paint. Found something on amazon and people over their have mixed reviews about it.

ACDELCO - ACDelco GM Original Equipment 19354940 Black (WA8555) Touch-Up Paint - 5 oz Spray
SEM - SEM 19423 Black Factory Pack Aerosol, 12 oz (Gm Wa8555)

All the paint shops near me are asking for 400-500$+ which lands me on the same price of fixing the dents. I am willing to buy an electric sprayer although never had any experience with it but if anyone knows or have had good experience with a particular spray can (or the ones I listed) please let me know. If not I am down to buy a sprayer and convert my garage in a small paint booth for this job. However, I still wouldn't know where to buy the paint from.

Any resources, advice are much appreciated.

 

[Calvoray71]

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

I still cannot find mine

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:

i can’t find this pigtail was yours under the center console or closer to the firewall ?

 

[2015TahoePPV]

Comes up between the seats, hopefully the th is still intact.

 

[k09viper]

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:

Thank you so much!! The way you described the "pair of wires (in the same loom)" finally got my to realize I wasn't looking for something in addition to this to connect them to but that it goes to itself. I going the 6J4 and thought I would be able to do it but with anything to connect it to I was at a loss, but never would I have thought it would just need to be connected like this. My 2019 PPV Tahoe horn is all good now, I was hours into this and I couldn't have done it without this post