Jump to content

Can't figure where this plug goes behind dash

TheStug
 Share

Recommended Posts

TheStug Enthusiast

TheStug

Posted
Posted

I'm putting my truck back together (new cab), and I've got almost everything except for this one plug and for the life of me I cannot figure out where it goes.

 

Attaching pictures. It's not the light sensor which I show in the first picture, already plugged.... I'm stumped right now. Not sure if it is plugged up top or down low (I think I've eliminated the steering column because I don't see any extra receptacles). Already have 2 plugs ready to go for A Pillar tweeters so that's not it either. I've looked under the dash and at the top part of the dash multiple times and can't find anything. I'm really trying to avoid having to pull out the dash a second time

 

Color of wires. I'm off to look for wiring diagrams but I usually don't have much luck finding what I'm looking for.

 

A - Yellow/Blk stripe

B - Brown/White Stripe

C - Green/Blk stripe

D - Green/White Stripe

E -

F - Solid Tan or light brown

G - Solid Dark Green

H - 

IMG_20200807_104236143.jpg

IMG_20200807_104310406.jpg

IMG_20200807_105735435.jpg

TheStug Enthusiast

TheStug

Posted
  • Author
Posted

Anyone able to provide document resources? Exploded views etc? Forward view Pictures of the plugs themselves (to see the tab shape would help quickly identify it) with pin out #s and what the function of the plug is would also be excellent. I can't seem to find anything useful. the GM upfitter had pictures of some plugs, but nothing related to this.

 

I am also dealing with trying to replace the back half of the parking brake cables (both), but so far cannot even find parts diagrams. So basically, my big challenge right now is finding some freaking diagrams. I don't remember it being so hard to find diagrams. I really have only owned 90s stuff to this point. 

davester Senior Enthusiast

davester

Posted
Posted

the full service manual has pinouts, wiring harness path (at least the FSM for my truck has that).  You might try subscribing to it at a site like alldatadiy.com

carkhz316 Enthusiast

carkhz316

Posted
Posted

I tried looking at Alldata for you, but I can't discern where it goes either. My best guess according to the diagrams is one of the blend door actuators as they share some of the colors, but most of those are 5 wires (not sure on the actual pin count though). In lieu of that, run the truck and see what doesn't work anymore.

TheStug Enthusiast

TheStug

Posted
  • Author
Posted

I pulled out the dash slightly (i didn't disconnect any cables so i could only go out so far) but I could not see anything. I did find one extra unused plug neatly tucked near the upper hvac tube delivering air to the very left side of the dash but it's not the correct shape for the receptacle. I'm thinking GM just made a standard wiring harness and whatever option I didn't get on the truck, the plug is left dangling.

 

I am leaning toward it being a HVAC thing or an additional steering wheel control feature. Anyone with heavily optioned trucks, if you wouldn't mind looking under in the area of the steering column and see if you can find this plug? I'll see if i can find a ltz or something to look at. Peace of mind and all that. I'm gonna go ahead and proceed with putting things together and turn it on as soon as i can.

 

Fingers crossed

carkhz316 Enthusiast

carkhz316

Posted
Posted (edited)
5 hours ago, TheStug said:

I pulled out the dash slightly (i didn't disconnect any cables so i could only go out so far) but I could not see anything. I did find one extra unused plug neatly tucked near the upper hvac tube delivering air to the very left side of the dash but it's not the correct shape for the receptacle. I'm thinking GM just made a standard wiring harness and whatever option I didn't get on the truck, the plug is left dangling.

 

I am leaning toward it being a HVAC thing or an additional steering wheel control feature. Anyone with heavily optioned trucks, if you wouldn't mind looking under in the area of the steering column and see if you can find this plug? I'll see if i can find a ltz or something to look at. Peace of mind and all that. I'm gonna go ahead and proceed with putting things together and turn it on as soon as i can.

 

Fingers crossed

I took that into consideration as my truck is a LTZ, and I checked all the options I could think of and there really isn't any more that are in the dash that I have that differ from the base model. When you look at the plug, are there any "witness marks" on it (scratches/ striations from being plugged/ unplugged)? From what I can see, it looks like a lot of it is dusty, insinuating that it's a leftover for another model/ option and was never plugged in. Here's hoping you can get it solved. Good luck!

Edited by carkhz316
  • 1 year later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • newdude
      Lower trims ( WT, Custom, Silverado ( aka LT )

      By newdude · Posted

      HD at the moment, are kinda their own deal.  How LTZ sells on those vs on 1500, there is a difference.   They are merging most of the mid trims on 1500.  LT, RST and LTZ are replaced by one trim, Silverado.  LT and RST are a BIG portion of sales.    Bad naming choice aside, the new Silverado trim will offer the spread of options that those three trims offered.  So expect to see things like the tech package for example, and memory seats.  And LT Trail Boss will now just be "Trail Boss" (formerly LT Trail Boss) but will offer content spread like the new Silverado trim will.  The press photos showed the Trail Boss (formerly LT Trail Boss) has access to Super Cruise now, which on the current truck was High Country only.       Here is the Trail Boss interior.  Memory seats and Super Cruise are present.  All things the LT Trail Boss it replaces, and the RST it was based on didn't get on the current gen.  You had to go to LTZ or ZR2 for memory seats, and High Country for Super Cruise.      
    • dennismc
      2021 vs 2026 handling (1500 X31 Sierra)

      By dennismc · Posted

      I installed a Hellwig rear sway bar on my 21 Sierra SLT, it made a huge difference on how the truck handles, no body roll, the trucks much more planted now. Not sure of the suspension differences between the 21 and 26,  if its body roll your having a sway bar will solve it. 
    • Old Bay
      frustrating P0446 code

      By Old Bay · Posted

      So a follow up and my fix. I found in online searches the live data to look at on a scan tool to verify the fuel tank pressure sensor was working.  It showed an spec number towards the lower end of the rang, but in spec.  Then while it was running opened the gas cap and the pressure should change.  It didn't change even a tiny bit.  The data for the purge valve said it was open...never changed. So then I measured the voltages on the plug for the fuel pressure sensor and they matched what it should be.  So local car quest parts had the sensor in stock...it was a bit of a pain to remove and an even bigger one to get it to actually go back in.  It helped to unbolt the driveshaft and bungie cord away from the gas tank to give a bit more room to work. So fuel tank pressure sensor in I cleared the code, and started it up.  I went to the scan tool's live data and... Eureka! The pressure number was different and fluctuated a bit.  So took it on a short drive and pressure number varied saw the purge valve go from closed to open and back to closed.  Drove it to and from work for roughly a week plugged in the scan tool no codes.  I took it in to get tested and passed.  In my state's infinite wisdom (oops meant greed), since I pushed the test with the maximum extensions I have to take it back in by Feb '27 to 'get it back up to date', then my next test won't be until Feb '29. 
    • newdude
      loose lug nuts

      By newdude · Posted

      Any grease on the stud threads of any kind?   Wheel studs should have NOTHING on them for proper torquing and so the nuts don't back off.     Are all of the mating surfaces clean?  So wheel, rotor and hub?     We've had plenty of trucks at work with that wheel, this is a first to me.  Makes me think they've got a lube tech putting anti-seize on all the wheel studs or some kind of grease, and they need to stop doing that.  To have 11 other trucks with the same exact problem.      
    • Flynlow
      2027 Chevrolet Silverado: Official Discussion

      By Flynlow · Posted

      I was a Chevy guy for years, then switched to GMC because I liked the looks better.  I'm actually thinking I like the Chevy looks better than GMC for the first time in a lot of years.   One thing I know for certain, the new GMC dash is hideous!  Chevy wins this one!  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...