Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN









Search Auto Parts

GMC Yukon mystery wire and stereo short


  Email This Post



Hitailer4
Novice

Apr 21, 2022, 2:07 PM

Post #1 of 15 (286 views)
GMC Yukon mystery wire and stereo short Sign In

2012 GMC Yukon XL
5.7 L V8 140000kms

My car radio went dead there is no sound or controls from the steering wheel signal lights will not sound when turned on fuses for the audio app numbers 40 and 41 or 41 and 42 depending on model checked all fuses are good and still will not power on.

I also have a mystery wire underneath the steering dash and no clue where it came from or what it’s supposed to plug in to.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 21, 2022, 2:52 PM

Post #2 of 15 (284 views)
Re: GMC Yukon mystery wire and stereo short Sign In

Need some clarification here.

Is it only the steering wheel controls you have a problem with or is the radio dead from all controls?

Is this a factory OEM unit?

What engine does is have. There is no 5.7 option for a Yukon of that year.

We also need to know which stereo option you have.

Here are the choices. You can find the RPO codes sticker in the glove box.





~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hitailer4
Novice

Apr 22, 2022, 5:27 AM

Post #3 of 15 (246 views)
Re: GMC Yukon mystery wire and stereo short Sign In

I’ll find out the radio code. Oh and my mistake it’s a 5.3 L.
Everything is OEM. The radio unit is completely dead but the climate control unit is fully functional and for the steering wheel controls nothing on it works so that means no controls for the radio no controls for the Cruise control and heated steering wheel etc.

And here is a Mystery wire I can’t seem to find will plug anywhere.



(This post was edited by Hitailer4 on Apr 22, 2022, 5:34 AM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 22, 2022, 6:29 AM

Post #4 of 15 (239 views)
Re: GMC Yukon mystery wire and stereo short Sign In

That wire is curious. I normally wouldn't be concerned with loose plugs as that is common for accessories the vehicle is not equipped with but that one looks like it was being used. It also appears to have an inline fuse added to it.

Has anyone done any work around the steering column recently? Under the dash anywhere?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 22, 2022, 6:38 AM

Post #5 of 15 (235 views)
Re: GMC Yukon mystery wire and stereo short Sign In

In my view + seeing the non OE fuse it's for a trailer! Nothing to do with sound system?

Too coincidental - white is ground, brown is running lights, green is right brake/directional and yellow same for left. Check it with a plain test light bet that works right there missing some long cord of that to use a light trailer. Red is an IDK isn't used for light duty was some other reason??

T



(This post was edited by Tom Greenleaf on Apr 22, 2022, 6:43 AM)


Hitailer4
Novice

Apr 22, 2022, 6:49 AM

Post #6 of 15 (230 views)
Re: GMC Yukon mystery wire and stereo short Sign In


In Reply To
In my view + seeing the non OE fuse it's for a trailer! Nothing to do with sound system?

Too coincidental - white is ground, brown is running lights, green is right brake/directional and yellow same for left. Check it with a plain test light bet that works right there missing some long cord of that to use a light trailer. Red is an IDK isn't used for light duty was some other reason??

T


Thanks. Vehicle was last used by someone who had a trailer. The wire was left dangling after use.

And can’t decide the rpo codes. New to gm stuff. I just know the radio is a standard radio with aux plug in and the non 8” screen. Very basic model one.

Curious why the steering controls for cruise and heated wheel stopped too. The in line 7.5 fuse is good still too.

As for radio. Took it out. Inspected wires and nothing. Might be further down the line.

But worth noting. Dash lights will flicker and a good old smack on the dash will straighten it out….dreading the hunt for a fray short somewhere.


(This post was edited by Hitailer4 on Apr 22, 2022, 6:52 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 22, 2022, 6:57 AM

Post #7 of 15 (224 views)
Re: GMC Yukon mystery wire and stereo short Sign In

Prove that right it will light up as I said.

It's a nightmare to wire trailers at some risk the truck's wiring wouldn't be the same colors. Go look at the other end find non OE connectors.

If a U-Haul or other place might do something like that or DIYer poking wires see which ones lit for what to some standard plug extension cord.

Test it out so then see what might be hacked where those connect?

Strong guess,

Tom



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 22, 2022, 7:37 AM

Post #8 of 15 (219 views)
Re: GMC Yukon mystery wire and stereo short Sign In

If that wire is under the dash it has nothing to do with turn signals. There is no turn signal power anywhere in that area.

The length and location of the wire may indicate it came from the steering column area. The reason I asked about previous repairs is because it may have been plugged into the clockspring for steering wheel controls. I am very curious as to what that fuse is for because those wires do not appear to be large enough for current carrying.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hitailer4
Novice

Apr 22, 2022, 8:23 AM

Post #9 of 15 (216 views)
Re: GMC Yukon mystery wire and stereo short Sign In


In Reply To
If that wire is under the dash it has nothing to do with turn signals. There is no turn signal power anywhere in that area.

The length and location of the wire may indicate it came from the steering column area. The reason I asked about previous repairs is because it may have been plugged into the clockspring for steering wheel controls. I am very curious as to what that fuse is for because those wires do not appear to be large enough for current carrying.


I couldn’t get the cover off that fuse not matter how hard I tried. I don’t believe it was ever repaired before. My partner got it used but the steering controls worked and it stopped last year (purchased like 2-3 years ago)

The fuse for the audio #42 was blown but replaced it and it’s still not working. And didn’t blow this new fuse yet either.

Thank you both for the input and responses so far.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 22, 2022, 8:42 AM

Post #10 of 15 (208 views)
Re: GMC Yukon mystery wire and stereo short Sign In

Even the most basic radio has a very complicated circuit so you may need professional help to look at this. The fact that you had a blown fuse indicates something serious is going on and I still think someone has been messing with the wiring on this and has likely caused some problems.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 22, 2022, 9:58 AM

Post #11 of 15 (197 views)
Re: GMC Yukon mystery wire and stereo short Sign In

I'm still worried about who or how they tapped into power for that plug?
Your there, I'm here so you do the looking on your back up and under bet you see what was messed with??

It's what we don't know if that wire tapped into just what lit up poking wire or someone had some clue which or what to tap?

The electrical tape job looks OK but just that if tucked up and under when not in use tugging on what/where tapped - went bad the domino effect harm something else - the clue of the day.

If you can't open that inline fuse I'm surprised? It should use the larger fuses, double spade and still be lower than where it came from??

I don't know but looks like a hack job I do know some specifically U-Haul doesn't hack things up folks don't like the cost of hitches (famous for them) and the rentals install the plug to what you wanted. I couldn't guess all the locations what tech did what it isn't what I expect of those type places and now it's yours,

Tom



Hitailer4
Novice

Apr 22, 2022, 4:58 PM

Post #12 of 15 (184 views)
Re: GMC Yukon mystery wire and stereo short Sign In

Yeah. Considering it was a used vehicle too I can only assume things were just stuffed back in.

I will consider the steering wheel clock spring thing.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 22, 2022, 10:58 PM

Post #13 of 15 (172 views)
Re: GMC Yukon mystery wire and stereo short Sign In

 I really would like to know for you and for sure that's a trailer plug and how it was tapped into this truck's wiring.

That would be the source problem so this doesn't just repeat with a fix to do this all over again.

An LED test light is dirt cheap still would like to know if that plug does work for a trailer's lights? Skip the red wire (for now) the power comes for smaller trailers from the "like" thing of lighting.

If more complex (the unknown trailer) it had brakes (electric) gets nasty complex you get another "smart box" that tries to figure out amber directionals to just red and what to do with ABS braking!

The mystery continues prove that thing out + if never to use it remove that and repair expected damage to wires,

Tom



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 23, 2022, 3:36 AM

Post #14 of 15 (166 views)
Re: GMC Yukon mystery wire and stereo short Sign In

That is NOT turn signal power. There is no power running through the turn signal switch. The circuit doesn't work that way. The switch uses ground signal to the BCM.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 23, 2022, 3:59 AM

Post #15 of 15 (162 views)
Re: GMC Yukon mystery wire and stereo short Sign In

I meant test the plug end dangling and not covered. IF my guess is right it's power already there to short where stuffed up under.

Where other ends go we don't know but suspect it once worked now part works?

What it must have wrecked yet to find out if ever any power to it open like that has to be solved,






  Email This Post
 
 


Feed Button




Search for (options) Privacy Sitemap