Jump to content

7-way plug issues

Shawn O'Leary
 Share

Recommended Posts

Shawn O'Leary Enthusiast

Shawn O'Leary

Posted
Posted

Hi Guys:

 

Bought an Airstream to tow behind my 2019 GMC Sierra Denali (added a leaf spring package and the Brembo brake upgrade to assist with it, but that's another topic). Anyway, the truck doesn't recognize the trailer nor any tester units. Only the 12v power works; none of the signals/lights (rechecked with a multimeter and the same). I've checked the connections and grounds and as far as I can tell everything is fine. I've checked it both with tow/haul on and off; same deal. 

 

Before I throw my hands up and make an appointment with the dealer is there anything obvious I'm missing? Thanks!

RocksRock Enthusiast

RocksRock

Posted
Posted
20 minutes ago, Shawn O'Leary said:

Hi Guys:

 

Bought an Airstream to tow behind my 2019 GMC Sierra Denali (added a leaf spring package and the Brembo brake upgrade to assist with it, but that's another topic). Anyway, the truck doesn't recognize the trailer nor any tester units. Only the 12v power works; none of the signals/lights (rechecked with a multimeter and the same). I've checked the connections and grounds and as far as I can tell everything is fine. I've checked it both with tow/haul on and off; same deal. 

 

Before I throw my hands up and make an appointment with the dealer is there anything obvious I'm missing? Thanks!

Hi Shawn:

I pull a large equip trailer. It was plug and play, no problems.
 

I used to pull a 26’ Passport. I would check fuses on RV and truck first. 
If all good there, then dealer. 
Hope this helps. 

Shawn O'Leary Enthusiast

Shawn O'Leary

Posted
  • Author
Posted
7 minutes ago, RocksRock said:

Hi Shawn:

I pull a large equip trailer. It was plug and play, no problems.
 

I used to pull a 26’ Passport. I would check fuses on RV and truck first. 
If all good there, then dealer. 
Hope this helps. 

Didn't think of the fusebox (slapping my forehead). Will check that next before taking it in. 

slj2008 Senior Enthusiast

slj2008

Posted
Posted

Why didn't Airstream check them out when you hook up ??   ON my 2015 the cables were laying by the Fuse Box ( under hood ) one for 12volts power , and the other for all your lights . CHECK your main Fuse box under hood.

EddDe Enthusiast

EddDe

Posted
Posted
12 hours ago, Shawn O'Leary said:

Hi Guys:

 

Bought an Airstream to tow behind my 2019 GMC Sierra Denali (added a leaf spring package and the Brembo brake upgrade to assist with it, but that's another topic). Anyway, the truck doesn't recognize the trailer nor any tester units. Only the 12v power works; none of the signals/lights (rechecked with a multimeter and the same). I've checked the connections and grounds and as far as I can tell everything is fine. I've checked it both with tow/haul on and off; same deal. 

 

Before I throw my hands up and make an appointment with the dealer is there anything obvious I'm missing? Thanks!

Download TSB 20NA198 at this link. There is a problem with 2019 models where light circuit will overload if too many incandescent bulbs are on a trailer. Issue was changed on 2020 models to allow more amps.

https://www.carcomplaints.com/Chevrolet/Silverado_2500/2020/tsbs/tsb-20na198.shtml
 

Dmax3 Enthusiast

Dmax3

Posted
Posted

I've gotten "no trailer connected" notice a few times.  The truck receptacle does move in the mount, but the dealer told me it's normal and they couldn't replicate my issue.  I'll double check my trailer wiring, but pretty sure it's the truck, not the trailer.

LSMAN New Member

LSMAN

Posted
Posted

I have an Airstream as well. (On my 4th one).  When I purchased my truck remotely in march 2020  and the dealer delivered it (2020 RST) , There was no brake controller for towing. I made it very clear that I have an airstream and the sales guy apologized for mistake. His boss allowed him to purchase an aftermarket controller for me. it was ordered and sent to me-  I installed it. Looks factory. (I installed something similar an  aftermarket controller in my 06 Silverado for my 1966 Airstream)

Sorry if I missed the obvious here but does your truck have a factory brake controller?  If not you need one. If it does have a controller her is what I would do: 

Check the grounds on both the trailer and the truck.  Bad Grounds cause most problems.  With trailer unhooked from truck use a 12 volt battery and power up the trailer lights individually: running lights, brake lights electric brakes. Verify that the problem is not on the trailer side first. make sure that you do not power up the emergency brake pull. If engage for long period powering this will burn up that (plunger switch with cable.) LED lights will not cause the above problem.

  • 4 years later...
Colin Wayland New Member

Colin Wayland

Posted
Posted
On 1/21/2022 at 11:53 AM, Dmax3 said:

I've gotten "no trailer connected" notice a few times.  The truck receptacle does move in the mount, but the dealer told me it's normal and they couldn't replicate my issue.  I'll double check my trailer wiring, but pretty sure it's the truck, not the trailer.

 

On 1/16/2022 at 5:03 PM, Shawn O'Leary said:

They did, it's the truck not the trailer. Fuses are present and all good. Going to the dealer Tuesday. 

What ended up fixing your issue Shawn? My grandpa is experiencing the exact same issue and cannot figure it out. Thanks.

Colin

davester Senior Enthusiast

davester

Posted
Posted

...just fyi, both Shawn and DMax haven't logged onto the site since around when this thrad was active, 4 years ago.  you aren't going to get a response from either user...

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

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,960
    Total Members
    8,960
    Most Online
    doylej24
    Newest Member
    doylej24
    Joined

  • Who's Online   5 Members, 0 Anonymous, 744 Guests (See full list)

  • Latest Articles

  • Posts

    • jgaudet99
      Tire psi

      By jgaudet99 · Posted

      I tried before I updated the scan tool just incase an update messed it up, but it never worked so I updated the scan tool and it still didn't work.   Only difference is I click on Sierra not Chevrolet cause I have a Sierra.   If I click on 2026-2024 I didn't have any option to change placard, when I click on 2023 it does give me the option but when I try to do it,.it says vehicle not supported!   I have my region or market or whatever it is set to America I think, is that what yours is set to?
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      Its just that it worked on 2024 trucks on this forum and my 2025 model truck, unless GM did something since that point to screw up access or Autel has a bad update. I haven't had need to use my tool since last year when I did the changes to the placard pressure settings and since then I updated the software on my Autel but have not plugged into the OBD so hard to say if I would get a surprise as well.    All I know last year when I bought the Autel I was warned to be sure to update it before I tried using the unit as they said who knows how long ago unit itself was actually manufactured as the software could be way out of date. 
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      And so you had gone through the process of registering and updating the tool and so on ?. All I can say is that on the front page as the tool fires up you go to advanced mode, then vehicle model comes up and you choose Silverado ( not the DRW or EV  since your a single rear wheel ) , then I think its choice 2 which is 07/2021 - 12/2026 ( 433mhz 13542523 ) as that is the series of tpms sensors and then go down to choice 5 which is tire type/pressure selection. Hit yes and it says to connect to OBD port and turn ignition on.    Having said this, I updated the software in my tool lately and these year range choices look different from the past due to them doing some updates it would appear and I have not connected up to the OBD port since last year so hopefully I am not in for a surprise with them screwing up the software and that it won't work on my truck anymore either.    So my question is, when you plugged into the OBD and started your truck it had that message on the Autel screen "vehicle not supported" ?. That does seem odd as tire shops would be pissed right off if hey can't use their tool on the model year after mine that in theory is supposed to be much the same truck ... unless GM did some change in the computer system to block certain things from access. 
    • Atlas
      Tire psi

      By Atlas · Posted

      Understanding and using modern scan tools is its own body of knowledge. I had little hope that would work...programming access to the BCM is probably required and that is not easy for us consumers. Expensive scan tool, GM programming subscription, online authentication, etc.   It also may be a matter of finding the right dealer to program it for you. Flashing a modern BCM might be a little too advanced for most tire shops.
    • SwitchBladeSierra
      AUX switch install

      By SwitchBladeSierra · Posted

      Update for anyone following:    Installed everything as shown in diagram. Opted for 8 AWG from Battery Positive to a 50A resettable inline breaker. 8 AWG is tied into to 2x 12 AWG wires feeding a 6 way fuse bus in parallel (manufacturer’s design of what I purchased).    4 of the 6 fuses available for circuits are tied to terminal 30 of each relay. I tied a jumper from one of my spare circuits off the bus to terminal 86 of each relay. The trigger, terminal 85, was pulled from my interior by way of T-Taps from the X61A-X5 pins 10, 11, 17 and 23. This was the hardest part of the job. Even with the X61A unbolted and the X5 removed - there was VERY little wiggle room.  I added back up lights that I want to come on with my cargo lamp - but when I would check continuity between S48A-X1 pin 18 to its respective landing point on the X61A-X5 it triggers the factory relay… Instead I opted for a add-a-fuse on the passenger interior fuse panel (fuse location 10 - cargo lamp) and ran it through the boot on the driver side to my load. Did this to avoid introducing any electrical gremlins.   Note: Please check for continuity between the S48A-X1 and the X61A-X5. In my case wire colours were not the same as other’s who have posted. To do a continuity check you need a Multimeter. Completely disassemble the S48A-X1 and remove the brown face plate off the X61A-X5 by way of a flat head screwdriver - this was the only way I could get any results.   The outputs, terminal 87 of the relays, were fed into a junction box and landed at Individual studs and were labelled Aux 1-4.    At this point, all you need to do is run wire to your loads and bring them to ground. I created a negative bus in the engine bay, all my negatives land here.    For anyone having issues with all of your new aux switch lights coming on with the press of one - I noticed this only to be an issue when the battery wasn’t hooked up to my relays? No idea why, but it was quickly corrected by having my system buttoned up and functional.     

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...