OEM trailer brake controller and wiring

[tbarn]

They pretty much all have the harness from what I remember.

[Z71 _ GMC]

On 4/4/2021 at 5:51 PM, C Bass said:

I know this is an old post from the dates but I just wanted to see if any others were still on this subject. I have a 2014 Silverado 1500 Z71 LT with the 5.3 v8 and 3.42 rear end. With that being said I too was looking to get the factory trailer brake installed if it was at all possible. Well after reading here and going to 2 different dealerships and having my VIN ran to see if there was a kit I was told "No". So I went and got an aftermarket one to install myself (plug and play). Because i didn't want it down by my knees i designed to put it in the slot the factory would go since it was small enough. Upon pulling the panel to start the installation and fabrication I was shocked to see a wiring harness plug attached to the plastic (holder) directly where the factory would plug in. I went to a 3rd dealerships and informed them if what I found and to their disbelief and interest ordered a factory controller and panel just to see if indeed it is wired for it. I will find out Tuesday afternoon if indeed this is true. So long story short if you so happen to have a Silverado 1500 with the 3.42 rear end if you don't have the factory trailer break try removing that panel and seeing if that wire is attached like mine was. I will update this after my visit to the dealership Tuesday. 

Which PnP controller did you use to fit in the factory slot?

[mikeyk101]

On 4/4/2021 at 5:51 PM, C Bass said:

I know this is an old post from the dates but I just wanted to see if any others were still on this subject. I have a 2014 Silverado 1500 Z71 LT with the 5.3 v8 and 3.42 rear end. With that being said I too was looking to get the factory trailer brake installed if it was at all possible. Well after reading here and going to 2 different dealerships and having my VIN ran to see if there was a kit I was told "No". So I went and got an aftermarket one to install myself (plug and play). Because i didn't want it down by my knees i designed to put it in the slot the factory would go since it was small enough. Upon pulling the panel to start the installation and fabrication I was shocked to see a wiring harness plug attached to the plastic (holder) directly where the factory would plug in. I went to a 3rd dealerships and informed them if what I found and to their disbelief and interest ordered a factory controller and panel just to see if indeed it is wired for it. I will find out Tuesday afternoon if indeed this is true. So long story short if you so happen to have a Silverado 1500 with the 3.42 rear end if you don't have the factory trailer break try removing that panel and seeing if that wire is attached like mine was. I will update this after my visit to the dealership Tuesday. 

I'm guessing you didn't take the time to go through this thread. Yes, the wiring behind that panel is there. Yes, the controller is available. But there hasn't been anyone successful at getting it to work. And this is after several years of owners trying...

[kensampson]

On 3/21/2015 at 9:05 PM, darkfox1 said:

This is the way it was in the GMT-900 too iirc.

 

The wiring is there though. If you want to work with some aftermarket BCM programming folks to see if they can enable it... but there's no guarantee it's ALL there.

 

Don't know that GM can no longer re-do the BCM. Just a few weeks ago I spoke to a dealer who said they could reprogram my BCM to accept factory fogs despite there being no RPO for them on my truck.

 

http://i956.photobucket.com/albums/ae50/darkfox118/100_5805.jpg

 

Note the top harness plugging into the empty pocket where the switch goes.   and where is the other end ive looked  everywhere for it