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  1. Custom Fit Vehicle Wiring
  2. Nissan
  3. Frontier
  4. 2012
  5. CURT
FITS 2012 Nissan Frontier
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
CURT

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Part Number: C56225
In Stock
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$59.72
Retail:$89.95
You Save: 34%
Custom Fit Vehicle Wiring
Confirmed to Fit
2012 Nissan Frontier

without factory trailer connector

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The best technical support and full custom fit vehicle wiring installation instructions. Great price Frontier custom fit vehicle wiring and expert service. Nissan Frontier, 2012 custom fit vehicle wiring by CURT are available from etrailer.com. For expert service call 1-800-940-8924 to order your Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part number C56225, or order online at etrailer.com.
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  • Reviews (451)
  • Q & A (0)
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2012 Nissan Frontier - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

  • 4 Flat
  • No Tow Package
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Plug-In
  • CURT
  • Plug and Lead
  • No Converter
  • Visible

Quickly and easily install a 4-way trailer connector on your Nissan Frontier with this custom harness. T-connector plugs directly into existing wiring. Required relays included.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate 12-pin wiring harness behind passenger's-side kick panel
    • Insert harness with relays (included) into 12-pin connector
    • Locate factory harness connection point behind driver's side rear bumper
    • Plug in connector
  • Comes with dust cap for 4-way flat connector
  • Limited 1-year warranty


Installation

Location of 12 pin connector

This custom-fit T-One connector plugs into your vehicle's 12-pin wiring harness located behind the passenger's-side kick panel.


Location of OEM connector

Once you've plugged in the 12-pin connector, plug the 4-way harness in beneath the vehicle, behind the driver's side rear bumper


Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.


It is recommended that you use a small amount of grease on all electrical connections - the plug on your automobile and the 4-pole connector itself - to help prevent corrosion.



56225 Curt T-Connector - 4 Wire

Compare to Tekonsha 118525

Installation Details C56225 Installation instructions

California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.8

451 reviews
Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Required relays included.

by:
2015 nissan Frontier

This kit has exactly what my 2015 frontier needed. The pieces are good quality and everything for exactly as it should. The instructions were accurate and I was able to install everything, but some steps were a little vague and a couple of additional pics would have made them more clear. Additionally, a mounting bracket for the trailer connector would be a great addition.



by:

Everything came as planned. The wiring harness worked perfect. The video made it very simple.



by:
2015 Nissan Xterra

Wiring harness fit my Nissan Xterra perfectly. Took about 15 minutes to hook everything up and the trailer lights all work as expected. Very happy with the harness, relays, and trailer connector.



by:

Connects perfectly with the stock wiring. Looks factory. Good product to have if your Xterra didn’t come with a tow package

Raleigh profile picture

Raleigh

3/29/2025

Been good after a year. Still works as expected!



by:
2007 NissanFrontier

Excellent product. The installation process couldn't be easier.



by:

This was not listed as an exact fit but worked perfect with my 2024 Nissan Frontier. It all plugged into the factory wiring. Made for a very easy instillation.



by:
2006 Nissan Xterra

This wiring harness plugged in and the install only took about 15 minuites start to finish. It worked great!



by:

This was easy, clear instructions, simple procedure



by:
2019 NissanFrontier

I received my hitch and wiring harness kit for my 2019 Frontier within a few days after ordering. The items were well packaged, and nothing was damaged. The install instructions/video on your website were spot on. I had the whole thing installed and ready to go in less than an hour. Fit and finish of the etrailer hitch is very nice for the price. I would definitely recommend etrailer.com to others.



by:
2016 NissanFrontier

Easy installation... the online videos really helped.
I had an existing harness that was installed with the hitch and the running lights were not working and the shop couldn't figure out the problem!
I removed the passenger side panel and saw the relays were missing. I decided to just tackle the fix myself and it worked out great.



by:

provided everything I needed and more. It was securely packaged and in mint condition. I will be able to tow my trailer legally when it's dark.

Vince profile picture

Vince

12/15/2024

Exceptional. No problems at all.



by:

Looks good, haven't installed it yet.



by:

Great product! Wish I'd bought this first.
I wasted alot of time trying to get running lights on my Nissan Xterra pigtail. I had brake and turn signal only. Excellent customer service- Molly solved problem with this harness. Best of all - she saved me over $200.00 that Nissan wanted just to diagnose problem. If I can install this, anyone can. It only took 10 minutes and I had running lights.
Thank you



by:
2015 Nissan Xterra

Very simple install, plug and play electrical connections, very simple to use and very good quality product. Very happy it was put on in PA on Friday afternoon and hauled a uhal trailer to GA Saturday morning. Had 0 issues. Definitely a 5 star rating



by:

Just what I needed. Works great.



by:

Very easy to install worked great



by:

Good product fast delivery

Allen H. profile picture

Allen H.

5/16/2025

Installed easy and exactly as described!

Nick S. profile picture
Etrailer Expert

Nick S.

5/20/2025

@AllenH That is great to hear Allen! Those plug and play harnesses really make it easy. How often are you using it to tow with?


by:

Right part for the right car. Order shipped the day I placed it, arrived earlier than scheduled. Combined with their numerous videos on installation, hard to think of a better service package out there. So easy, so simple. And for less than half what my local parts shop quoted (and didn’t have in stock)
I’ve got three emails confirming order, shipment and delivery.

I’ll be back when it’s time to wire up the Rogue.



by:

Really great, it went in easy .I had Some help ,a salamander lounged near the rear wheel .possibly in a drunken stupor..
However, we both enjoy the wiring install (how often does anyone say that.) it snapped right into place !
By the time it takes a drunken salamander to dose off ..well job done !



by:

Easy to plug in, one in cabin and one under the hit her



by:

Worked as intended

Brooke M. profile picture
Etrailer Expert

Brooke M.

3/31/2025

Would your boss say the same thing about you, Matthew? Just some food for thought...:)



by:

It was awesome great product delivered great



by:
2019 NissanFrontier

Everything was on time and fit like a glove. Easy tracking shipment. Well done etrailer



by:
2012NissanFrontier

As advertised. Good components very easy to install works great



by:

I met the mail delivery person as she drove up, she handed me 2 package and 4 letters, after reviewing the delivery, your product was not among them, you may have indicated delivery, I'm desputing that no package from etrailer was not delivered, again I did not get my order


25
451
Show More Reviews

See what our Experts say about this CURT Custom Fit Vehicle Wiring

  • Troubleshooting Trailer Running Light Circuit of 2018 Nissan Frontier Not Active
    On certain Nissan vehicles like yours an additional blue relay is sometimes needed to activate the trailer running lights circuit. This appears to be the case with your 2018 Nissan Frontier since this circuit isn't active. This is a very common issue surprisingly. For the relay by itself you can use part # 38666-1 and the harness you need to access to plug the relay in is indeed located in the cab behind the panel to the right of the passenger's foot panel. It sometimes can be located...
    view full answer...
    Image 1 for
  • Trailer Running Lights Not Working on 2012 Nissan Xterra
    The issue is likely the relay for the running lights. The relay is attached to a wiring harness which is located behind the passenger side kick panel near the passenger door (see picture). You should see a harness with 2 blue relays and a larger brown relay. If both relays are there, then the relay is likely bad and should be replaced with the Curt Relay # C57000. If you do not see a harness with relays, then it is likely that the harness wasn't installed. Unfortunately, this harness...
    view full answer...
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  • How to Determine if 2005 Nissan Frontier has Tow Package for Installing Trailer Wiring
    The pin needed to install the # 118263 will be on the frame of the truck, but what matters most is whether or not the rest of the tow package wiring will be present. You would need to remove the passenger side kick panel to the right of where a passengers right foot would be. If there is a harness plugged in there that looks like what's picture then all you would need is the # 118263. If not you would need the part # C56225 instead.
    view full answer...
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  • Are Relays Required to Activate the Trailer Wiring Harness on a Nissan Frontier
    On the Nissan Frontier and other Nissan vehicles, if the vehicle did not come with a factory tow package it will not have a functioning wiring harness even if one, like # 118263, is added. There will be relays that will need to be inserted to make the trailer wiring harness fully functional. If your Nissan did not come with a factory tow package, you would need to use wiring harness # C56225. This harness comes with the relays needed and the wiring required to make everything functional....
    view full answer...
  • Recommended Wiring Harness w/ Relays for a 2023 Nissan Frontier
    That's because the Curt item # C56225 fits the 2005 - 2021 Nissan Frontiers. The correct one for your 2023 Nissan Frontier is the T-One Vehicle Wiring Harness item # 118525 for a 4-Way or item # 118266 for a 7-Way. I have linked a couple of installation videos below for both parts so you can see how to get them set up.
    view full answer...
  • Troubleshooting Trailer Running Light Circuit Not Functioning on Nissan Frontier
    Trailer running lights not working with certain Nissan vehicles is a common problem with an easy fix. There is a relay for the trailer running light circuit that is located in the fuse box (in the cab). If that relay is missing or no longer functions then it can be replaced with one of the blue relays from the Curt Relay Kit # C57000. The relay of the running light circuit on your Nissan Frontier is in the relay harness behind the passenger floorboard kick panel. If you check out the...
    view full answer...
    Image 1 for
  • Trailer Wiring Harness and Mounting Brackets for a 2016 Nissan Frontier
    We do have a variety of trailer connectors and mounting brackets that you can use on your 2016 Nissan Frontier. If you need a 4-Way Flat connector then the Hopkins # HM43575 will work if you have the tow package. If you don't have the tow package then I recommend the Curt # C56225. You can mount either of these using the Tow Ready # 18144 with a no-drill bracket like part # 18140. I have attached some installation videos and the instructions for you to check out.
    view full answer...
    Image 1 for
  • Installation of 4-Flat Wiring Harness on 2019 Nissan Frontier
    Installation of the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56225 that fits your 2019 Nissan Frontier (without a factory connector) is very straightforward, but installing a harness on a Nissan does require the use of relays, which are included with this kit. Start the install by attaching the relays, with the blue ones going on the white plugs and the brown one going on the brown plug. Then simply locate where you need to plug in the connectors and that's all...
    view full answer...
  • Availability Of Individual Relays That Come With Curt T-Connector C56225
    Hello Mark, thanks for reaching out. I am sorry to say we do not offer just the relays by themselves. The only way to get them would be with the complete wiring kit part # C56225. This is for a 2005-2021 Nissan Frontier.
    view full answer...
  • Trailer Wiring for 2012 Nissan Pathfinder without Tow Package
    Hey Dana, the Curt trailer wiring harness part # C56225 is a confirmed fit for your 2012 Nissan Pathfinder without the factory tow package or trailer connector. This comes with everything needed to activate the trailer wiring as well as provides the 4-way. With just installing what comes with this kit you'd be set.
    view full answer...
  • Are Relays Needed to Activate Tow Package Wiring in 2012 Suzuki Equator
    If the 4-pole connector you speak of was factory installed, everything should already be functional. If you've just installed a 4-ploe, using a part like # 118263, then the relay kit # C57000 would be needed. The brown relay activates the 12-volt circuit to the trailer connector (which you won't need since you have a 4-pole) and the two blue relays activate the right and left turn signal and brake lamp. Since you mentioned that you got a signal at the trailer connector with the turn signals,...
    view full answer...
  • Are Curt 4-Way Relays Compatible With Hopkins 7-Way on 2017 Nissan Frontier
    The relays for the Curt # C56225 on your 2017 Nissan Frontier are the same as the ones that come with the Curt 7-Way # C56226. Since you already have the 7-way functionality from the relays that came with your 4-way you will be able to install and use the Hopkins # HM43534 without the need for additional parts.
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  • Parts Needed for 2023 Nissan Frontier to Tow Trailer With Brakes
    Towing a trailer with brakes will require adding a 7-way along with a brake controller. Since you were already looking at 4-way wiring I'm assuming there is no factory trailer connector on his 2023 Nissan Frontier. All you will need to add a 7-way is the Curt T-Connector Vehicle Wiring Harness # C56226. The brakes and the lights aren't tied to the same wires but the 7-way will take care of powering all your lights along with sending power to the brakes. For a brake controller, I recommend...
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  • Towing Relays for a 2022 Nissan Frontier
    I checked with our vendors and the only option to purchase the relay you need for your 2022 Nissan Frontier is to get the Curt T-Connector Vehicle Wiring Harness item # C56225. This includes the necessary relays that Nissan leaves out when building their trucks. However, it does also include the wiring harness. We don't sell the relays separately and I wasn't able to find them online without the harness unless you go through a Nissan dealer. I have linked an installation video below to...
    view full answer...
  • Recommended Trailer Hitch Wiring Harness For A 2023 Nissan Frontier
    The Curt wiring harness # C56225 is not confirmed to fit the 2023 models of the Nissan Frontier, but do I have two options for you to choose from though. Option 1: The T-One Vehicle Wiring Harness with 7-Way Trailer Connector # 118266. This wiring harness is completely plug-in so you won't have to hardwire anything, but it doesn't come with a 4-pole connector so you would need to use an adapter like # 47345. Option 2: The Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector...
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  • Recommended Hitch and Wiring Harness for a 2022 Nissan Frontier
    Yes, the Draw-Tite Max-Frame Trailer Hitch Receiver item # 75282 is a confirmed fit for your 2022 Nissan Frontier. It has a maximum gross trailer weight of 5,000 lbs and a maximum tongue weight of 750 lbs. I have attached an installation video and picture so you can follow along with the install process and see what the final product will be. You're going to need the Curt Wiring Harness with 4-Pole Flat Trailer Connector item # C56225. The connector plugs directly into your Frontier's...
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  • Trailer Wiring Fit For 2022 Nissan Frontier
    So you will need to access the 12 pin jumper plug in your Frontier's cab, which as you said is on the passenger’s side behind the kick panel. This is where you will install the harness and relays that activate the trailer tow package, and the correct harness for your 2022 Nissan Frontier, that does have those relays, is from Curt: - Curt Wiring Harness with 4-Pole Flat Trailer Connector # C56225 Then, to finish the install of the # C56225, underneath your Frontier there are two places...
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  • Recommended Trailer Hitch And Wiring For A 2022 Nissan Frontier
    For your 2022 Nissan Frontier, I recommend Wiring Harness # C56225. As far as a hitch goes we do have a few options for your truck, however, I recommend one of best sellers, the etrailer Trailer Hitch Receiver # e98869. This is a custom made class III hitch designed specifically to fit your 2022 Frontier.
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  • Location for Trailer Light Relay on a 2017 Nissan Frontier
    If you have an aftermarket wiring kit for your 2017 Nissan Frontier then the relays for your trailer wiring are located to the right side of the passenger's seat next to the door (see attached photo). I have attached a video of us installing the Curt T-Connector # C56225 on a 2019 Frontier that you can use for reference. For an OEM wiring kit I'm not sure if the relay is in the same location or not. I wasn't able to find anything in the online version of your owner's manual.
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    Image 1 for
  • Where Are the Relays for Trailer Wiring Plugs on 2019 Nissan Frontier
    I've included the link to one of our installation videos on the 2019 Nissan Frontier that uses the Curt # C56225, which comes with the relays included; these relays can also be purchased with the Curt Relay Kit # 59700. If you fast forward to around the 3:00 mark of the video it shows where the relays are located and how you'll install them, as well as the installation of the 4 way connector. The Hopkins Plug-In Simple Wiring Harness # HM43575 is designed for vehicles that came equipped...
    view full answer...
  • Trailer Running Lights Not Working on a 2012 Nissan Frontier
    If your 2012 Nissan Frontier has a 7-way trailer connector then you will need to use both blue relays as well as the brown relay. If you only have a 4-way trailer connector then you would only need to use one blue and one brown relay. If you do not have the relays then you can use part # C57000 to obtain them. It won't hurt anything to use both blue relays even if you only have a 4-way trailer connector. If you have the factory tow package then the relays will need to be installed in...
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  • How to Add 7-Way RV Wiring Harness to 2022 Nissan Frontier
    That you have the Curt Wiring Harness with 4-Pole Flat Trailer Connector, # C56225, is the first needed step. If you have not already installed this, please note the linked installation video below for assistance. The next item needed is the Universal Installation Kit for Trailer Brake Controller, # ETBC7. You will first install the 4-flat, which will power your trailer's lighting, and you'll then plug that into the 7-way that comes with the # ETBC7, which also gives you the wiring,...
    view full answer...
  • Troubleshooting No Power at Factory Trailer Wiring Plug on 2014 Nissan Frontier
    If you are not getting any power at the factory port where the Curt Wiring Harness # C55441 plugs into, this actually may indicate that your 2014 Nissan Frontier is not equipped with the factory tow package. The existing Curt harness will still plug into the factory port like you see on your vehicle, but without the tow package you will still need to add a relay harness for the port to become active. This relay harness is included with the Curt T-Connector # C56225. It is not available...
    view full answer...
    Image 1 for
  • Solution for Trailer Running Light Circuit Not Active on 2019 Nissan Frontier
    This is a very common issue with newer Nissan vehicles like your 2019 Nissan Frontier. There is a missing relay needed to activate the trailer running light circuit. The running light relay can be installed or replaced with # C57000. One likely place for the relay is behind the passenger side kick panel. There could be a harness with 3 relays attached to it. Or it can be behind the dash panel to the left of the steering wheel.
    view full answer...
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