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  1. Custom Fit Vehicle Wiring
  2. Toyota
  3. Sienna
  4. 2002
  5. CURT
FITS 2002 Toyota Sienna
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # C55418
Our Price: $44.78
You Save: 33%
Custom Fit Vehicle Wiring
Confirmed to Fit
2002 Toyota Sienna

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The best technical support and full custom fit vehicle wiring installation instructions. Great price Sienna custom fit vehicle wiring and expert service. Toyota Sienna, 2002 custom fit vehicle wiring by CURT are available from 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 C55418, or order online at
  • All Info
  • Reviews (64)
  • Q & A (0)
  • Photos
  • Why etrailer?

2002 Toyota Sienna - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Converter
  • CURT

Quickly and easily install a 4-way trailer connector on your Toyota Sienna with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required. Converter is made using SMT to ensure superior performance.


  • 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 connection points in rear cargo area
    • Plug in T-connector
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
  • Constructed using surface-mount technology (SMT) for consistent, reliable performance
    • Maximizes trailer light yield and intensity while producing minimal heat
    • Ensures superior operation in rough road conditions
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 3 amps per circuit
    • Tail lights: 5 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side interior trim panels in your rear cargo area.

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

Tail Light Converter with Surface-Mount Technology

A tail light converter is built into this T-connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of the trailer. This converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

Curt builds each tail light converter using surface-mount technology (SMT). This method of construction involves soldering electronic components directly to the surface of a printed circuit board. SMT eliminates the need for leads, which are used in older through-hole technology. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability and durability.

Curt SMT Circuit Boards

Circuit boards constructed using SMT have been shown to perform better under rough conditions with excessive vibration than those made using the through-hole method. And where would vibration be more likely to occur than in towing applications? Curt converters also produce less heat, leading to increased durability and longer life. In addition, lower levels of resistance ensure better performance, especially for parts that operate at higher frequencies.

Each Curt circuit board is made using high-quality components that are pieced together in the most technologically savvy fashion, leading to greater predictability and reliability in functioning.

55418 CURT T-Connector - Surface Mount Technology - 4 Wire

Installation Details C55418 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C55418

Average Customer Rating:  4.9 out of 5 stars   (64 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required. Converter is made using SMT to ensure superior performance.


I was about to wire up my van the old fashioned way which would have taken hours and then I found your harness online by accident. It was amazing. I had it hooked up in about 45 minutes and it works great!!


The Curt T-Connector was delivered promptly after I ordered it. etrailer provided me with a great installation video. It was a fairly simple install.

I'm glad I chose to order this from etrailer.


Easy installation! Good instructions.


Exactly as instructions shown.
Way too
Cannot recommend etrailors enough.


I very seldom give 5 star reviews, but is like seriously hitting the EASY button!! From the initial call to order the harness and the information I needed for my receiver hitch bolts, they were fantastic! When I need anything for towing or camping in my rig, is my new go-to company. You won't be disappointed I assure you.

2010 ToyotaSienna

Installed and tested the trailer wiring in my 2002 sienna this evening. Works perfectly. It took an hour to do, and I am a novice amateur with the confidence to try.
Tools required: a couple screwdrivers, a 10 mm ratcheting socket wrench. Its a good thing I have lean narrow hands to fit in the tight spaces. Even if I wanted to try splicing, and even if I had a way to get toyota wiring to match u.s. trailer lighting, I would have cursed myself silly for hours trying to work behind the panels of my van.
A tip for future users: don't try to drill in the ground. I lost the screw and a few more before discovering that the jack bracket will bolt the ground wire to the body of the van spectacularly.

I have had this installed for a year, now. It works great and I havent had to give it a second thought. The wire is nice and long, so it will reach out to the connector thats mounted too far back on my 14-foot trailer. My 4x8 trailer is more common for me to use, and there, too, I have no problem at all. It just works, plain and simple.
merinda - 02/11/2015


Super easy to install this and the wire length is great. I finally have power to my hitch cargo box and I couldn’t be more pleased with this kit. My one recommendation is that extra self tapping screws be included on the kit as I ended up losing the original one inside the car while trying to drill for the ground wire. Otherwise, install was super fast.

1999 ToyotaSienna

The product and price are great. I wish the video that showed the installation would have an option other than just letting the wire hang out of the back hatch of the vehicle. I would prefer to drill through the vehicle body and make it look a bit more professional. Other than that, it was a piece of cake to install and the video was perfect for basic install. I can't really complain, due to the amount of money I saved with e-trailer.

The manufacturer specifically designed the harness so the connector would be deployed from the interior of the vehicle when needed. This way, the connector is protected from damage when its not being used. The rear hatch of your vehicle has weatherstipping thats thick enough that the wire for the trailer connector wont be damaged as long as you avoid the latch area.
-- Etrailer Expert Mike L - 09/05/2018

2000 ToyotaSienna

This wiring harness arrived as advertised. It only took me 30 minutes to connect to my vehicle and that's only because I had trouble separating one of the panels on my vehicle and that had nothing to do with the harness. It was really simple to install and it worked great. Etrailer comes through again!!

Ford Flex

Thank goodness for the video that showed how to install the wiring harness. Unlike the last wiring harness I installed, there were no wires to be cut, matched up, and crimped. The existing wire harnesses were simple unsnapped and the new one snapped in between them - and it was instantly and easily attached. Did this on both sides, and attached the ground wire to the body with the screw provided. I must admit that the plastic panels did not flex as easily as in the video in order to get to the hidden wires, but it didn't impede the progress that much. I reassembled everything, plugged it into my trailer, and wah-lah! Let there be light!!!

2001 ToyotaSienna

Easy installation on a 2001 Sienna van. Wiring harness presented no problems once the interior panels are loosened up. Biggest problem is the age of the body panel clips and a couple of them broke before releasing. Others went well. No real damage, just not quite as tight as before, but not visible.
Smaller hands would have been better! Great product, saved us hundreds of dollars with self installation.

2001 ToyotaSienna

The hitch harness proved to be very easy to install by following the instructions and video and product-wise was a good investment. Over all, the transaction and the installation was a breeze. A "well done" shout-out to the etrailer crew!


Easy installation in our 2002 Sienna. We put the control module in the jack storage recess, and picked-up a ground from one of the bracket mounting screws in that same location - no drilling required. Works well, and is about as easy to install as it gets.


Just follow the directions and no need to probe wires with a test light or chance to mess your vehicle up! I did purchase a wire loom from my local Napa auto parts store and ran electrical tape to keep the wire loom intact and protect my vehicle from electrical shorts down the road.


1. Put some 1/4” split wrap around the cross-sill cable and harness so that you don't snag the wires on the sharp edges inside the vehicle going up to the lights or across the sill.
2. Be careful pulling off the sill plate -- you'll probably need to replace some of the fasteners.

All in all, very nice!


This as a replacement for an existing harness. It arrived when you said it would, the directions were easy enough for me to follow ( I had installed the existing harness), and it plugged in with no problems and works correctly.

2000 ToyotaSienna

Installation was simple and went exactly as shown in the installation instructions. I use my trailer frequently and the lights work everytime. I would strongly recommend this product for ease and reliability.

2000 ToyotaSienna

A quality product combined with the "How to" video makes for an exceptionally easy install. Thank You

2000 ToyotaSienna

I liked the simplicity of the installation. I will definitely use the same type harness whenever I install a hitch on another vehicle.


Phenomenal service. I will continue buying from Their service representatives are fantastic; giving me the impression that this is a family-owned business. Installation of the trailer wiring for my vehicle was a cinch, thanks to thier online installation video. You guys saved me about $100 at least. Keep up the great work.


Super quick follow up and delivery. Even confirmed delivery. GREAT! Wiring harness went in easy. Hitch piece solid.

1999 ToyotaSienna

Got the adapter one installed it per instructions fine. However it did not work properly. Took many hours of process of elimination to figure out why. Even bought a new adapter from someone else.
The instructions should include voltage requirements for each specific model.


Great product. Plenty of wire to make a professional looking installation.
Clear and adequate instructions
All terminals and plugs fit as they should and clicked into place as they should.

2003 ToyotaSienna

The wiring harness fit perfectly and it took about 15 minutes to install.

2000 ToyotaSienna

This product was pretty simple to install and it probably took me about 40 minutes total. The installation video made it really easy and was extremely helpful. I am not super mechanically inclined, and I was able to figure it out. If you have basic tools, and some basic know-how, you can definitely do this installation. I saved a lot of money by doing this myself.

Show More Reviews

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

  • Trailer Turn Signals are Only Working Intermittently on Trailer Towed by 2001 Toyota Sienna
    Ground problems can cause all sorts of weird things to happen. Most likely that is the problem. Since you tested the 4-Way on the van and it is working that narrows down the issue to the trailer. First make sure that the trailer connector is free of dirt and corrosion. This can cause a bad ground and if you are moving things around and it suddenly starts to work it could be because at a slightly different angle there is a better ground connection. OR there is a loose or broken connection...
    view full answer...
  • How to Install Curt T-Connector Vehicle Wiring Harness# C55418 on 2002 Toyota Sienna
    We sure do! I've linked you to the installation instructions as well as to an install video. In a nutshell, you'll remove the rear threshold and pull back the trim panels on either side of the cargo area so you can access the back side of the taillight assemblies. You'll unplug the vehicle wiring harness from the taillight assembly, plugging the half of the harness with the YELLOW wire inline between the taillight assembly and the vehicle wiring harness on the driver's side. Route the...
    view full answer...
  • 2000 Toyota Sienna With Low Voltage At 4 Pole Plug
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Item # C55418 on your 2000 Toyota Sienna with low voltage at the plug is most likely a ground issue. Follow the ground wire from the converter box to where it is grounded to the vehicle. If the self tapper was used, make sure the self tapper did not back out a little. Sometimes if the metal is not thick, the self tapper may not get tight enough and the ring terminal will be able to move. If this is the case re-locate...
    view full answer...
  • How to Remove Rear Threshold to Install Trailer Wiring on a 1999 Toyota Sienna
    To install the Curt Wiring Harness part # C55418 you will need to remove the rear tailgate threshold. Basically you will just pull straight up on it and it will come out. To see how a very similar wiring harness would install on a very similar Sienna as your 1999 model check out the video I attached. It shows how the threshold is removed as well as the rest of the install process.
    view full answer...
  • Trailer Wiring Harness for a 2001 Toyota Sienna
    There are several different wiring harness that will fit your 2001 Toyota Sienna and I have included a link to them for you. However, the harness that you referenced, # C55384, will not fit your Sienna. For a harness that plugs in line with the vehicle tail light wiring you can use # C55418. I have included a link to the installation instructions for you to view.
    view full answer...
  • Parts Needed to Tow Trailer with 2002 Toyota Sienna
    To tow a trailer with your 2002 Toyota Sienna requires first a trailer hitch like the part # 75120. Which is a confirmed fit. Then for trailer wiring you would want the part # C55418 which is also a confirmed fit. Since you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball, hitch pin with...
    view full answer...
  • Recommended Trailer Hitch Receiver For 2002 Toyota Sienna
    I have another option for you, but the Curt Trailer Hitch Receiver W/ Euro Drawbar C114122 is not confirmed to fit your 2002 Toyota Sienna. It is designed for select 2015-2021 Volkswagen Golfs. Instead I recommend the Curt Trailer Hitch Receiver # C13511 which is a confirmed fit for your Sienna. This hitch has a 350lb tongue weight rating and 3500lb trailer weight rating making it a perfect choice for carrying a bike rack, cargo carrier, or ball mount for towing a trailer. If you are...
    view full answer...
  • No-Drill Trailer Hitch and Wiring for a 1998 Toyota Sienna
    For a 2 inch, Class III trailer hitch for your 1998 Toyota Sienna you can use # C13511. There is no drilling required for installation. I have linked the instructions and a video showing installation for you. If you plan on doing some towing I recommend etrailer ball mount kit # EBMK4. It comes with a ball mount with a 2-3/4 inch rise or 4 inch drop, interchangeable ball set, hitch pin with clip, and a storage bag. If the ball mount kit does not have the right rise or drop to tow the...
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  • Trailer Hitch Recommendation for a 2000 Toyota Sienna for Camper Towing
    Both the Draw Tite Hitch part # 75120 and the Curt Hitch part # C13511 would work well on your 2000 Toyota Sienna. The only reason I would go for the Curt is because it costs less and has more positive reviews than the Draw Tite currently. This hitch has a 350 lb tongue weight capacity so it would work well with your cargo carriers. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch...
    view full answer...
  • Trailer Wiring Harness and Hitch that Fits 1998 Toyota Sienna
    If the trailer wiring harness you bought for the Dodge Caravan was a universal style like the # 119190KIT it would work with the 1998 Toyota Sienna but if it was a custom fit option you'd need to replace it as well like with the Curt # C55418 which fits the Sienna and would work great with the Curt hitch # C13511.
    view full answer...
  • Which Trailer Hitch and Wiring Harness for a 2002 Toyota Sienna
    The Curt # C13511 you were looking at is a great choice that will give you a 2 inch receiver that's ideal for towing or carrying a hitch mounted accessory. I really like Curt hitches because of the heavier powder coating they apply, which will stand up a bit better to nicks and scratches; this will be important in prolonging the life of the hitch and keeping it corrosion free. For the wiring harness I recommend using the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer...
    view full answer...
  • Parts Needed to Tow Trailer with 2000 Toyota Sienna V6
    An official tow package is something that can only be added on by the manufacturer of a vehicle. It can include a trailer hitch, wiring, possibly a transmission cooler, better brakes, lower gearing etc. For your 2000 Toyota Sienna we can help with some of that, but it wouldn't be an official Toyota towing package. For a trailer hitch you'd then want the Curt part # C13511 which is confirmed as a fit and would a great option with plenty of towing capacity. For trailer wiring you'd then...
    view full answer...
  • Parts Needed to Tow Small 5x8 Trailer with 2003 Toyota Sienna CE
    Para remolcar un trailer cerrado con tu Toyota Sienna CE 2003 vas a necesitar el remolque, los cables para las luces, el enganche, la bola de enganche y un pin y un clip. El mejor remolque para tu Sienna es el Curt # C13511 porque tiene el recibidor de 2 pulgadas y la instalacion es sumamente facil en comparacion a otros remolques disponibles para tu van ya que no requiere taladrar agujeros. Para el cableado, te recomiendo el # C55418 y para completar, el enganche # 2753 que incluye el...
    view full answer...
    Image 1 for
  • Towing Capacity and Parts Needed to Tow with a 2002 Toyota Sienna
    The first place to look in regards to weight ratings for any vehicle is the owner's manual. I took a look at the online version of the owner's manual for your 2002 Toyota Sienna and it states on page 244 that if you have the factory towing package your max trailer weight capacity is 3,500 lbs. Without the factory towing package your max trailer weight rating is reduced to 2,000 lbs so unfortunately you will need to look for a lighter trailer. From what I could tell it looks like the only...
    view full answer...

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Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Andrew K
Video by:
Andrew K
Employee Lindsey S
Written by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Nicholas E
Test Fit:
Nicholas E
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B

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