Recommended 4-Way Wiring Harness and Mounting Bracket for a 2015 Toyota Sienna LE
Updated 12/18/2025 | Published 12/14/2025
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Question:
Hey there, just installed a Curt 13343 on our 2015 Sienna LE and realize it doesn't have a wiring harness mount which seems like will make this option more difficult. Any suggestions?
asked by: Max B
Expert Reply:
Hey Max. To attach the T-One Vehicle Wiring Harness item # 118648 to your new Curt Hitch item # C13343, you'll need the No-Drill Mount Bracket item # 18136 and the Mounting Bracket 4-Pole Flat item # 18144.
The No-Drill Mount Bracket item # 18136 uses a band clamp to securely attach to the square crossbar on the Curt item # C13343. The Mounting Bracket 4-Pole Flat item # 18144 has a matching bolt hole pattern and will put your 4-way connector in a convenient location.
The T-One Vehicle Wiring Harness item # 118648 is confirmed to fit the 2015 Toyota Sienna LE. It will connect to the wiring behind your rear tail lights without cutting or splicing. This harness will give you a 4-way connector that is capable of controlling your trailer's lighting functions.
What kind of trailer are you pulling?
You can add this information, along with any other questions you have, where it says Reply to Jerred H.
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Product Page this Question was Asked From
Curt Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Trailer Hitch
- For Towing
- Class III
- 525 lbs TW
- 3500 lbs GTW
- 2 Inch Hitch
- Concealed Cross Tube
- CURT
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Max B.
12/15/2025
Thanks Jerred, incredibly helpful! We'll be pulling an Rpod 178 (~2600 lbs, braked) with our 2015 Toyota Sienna some of the time, and a 13' fiberglass camper (1500 lbs, unbraked) most of the time.