CURT 4-way Flat Trailer Wiring Harness for Select Toyota Sienna — Vehicle-side Plug-and-Play OEM 4-pin

CURT 56261 is a vehicle-specific, plug-and-play 4-way flat trailer wiring harness that installs into select Toyota Sienna taillight assemblies to supply safe, OEM-compatible trailer lighting connections.

Not all Toyota Siennas come pre-wired for towing, and retrofitting a trailer connection can be messy without the right parts. The CURT 56261 offers a factory-style solution that uses OEM-compatible plugs to mate with the factory taillight sockets. It supplies a standard 4-way flat output for tail lights, brake lights and turn signals, includes a dust cover, and relies on surface-mount technology (SMT) circuitry for reliable operation and longer life.

How does this harness install into my Toyota Sienna?

Installation is designed to be quick and reversible because the harness uses vehicle-specific connectors that plug into the factory taillight wiring. No cutting, splicing, or soldering is required, which preserves the vehicle’s original wiring and simplifies removal.

• Plugs directly into the taillight assembly using OEM-style connectors.
• Includes mounting points and hardware for a tidy routing of the cable.
• 4-way flat socket mounts near the hitch for easy trailer hookup.

What lighting functions does the 4-way flat provide for my trailer?

The 4-way flat supplies the essential trailer signals: tail/running lights, left and right turn signals, and brake lights. It’s compatible with most small trailers, cargo carriers, and light-duty towing applications that require only basic lighting functions.

• Tail/running lights: continuous power for marker illumination.
• Brake lights: stop lamp feed synchronized with vehicle brakes.
• Left/right turn signals: dedicated circuits for directional signaling.

What features help the harness last and perform reliably?

CURT engineered this harness with durability and consistent electrical performance in mind. The integrated tail light converter and SMT circuitry protect against common wiring issues and improve long-term reliability compared with generic spliced kits.

• Surface-mount technology (SMT) circuitry resists vibration and corrosion.
• Vehicle-specific molded connectors ensure secure OEM-style connections.
• Dust cover protects the 4-way socket from dirt and moisture when not in use.

Will this harness work with my Sienna model year and trim?

This harness is built to fit specific Toyota Sienna model years—verify compatibility with the product application details before purchase. Because it uses factory-style connections, fitment is precise, avoiding common fit issues found with universal kits.

• Designed for select Toyota Sienna years—check the CURT application chart.
• No vehicle wiring modifications required when matched to the correct model year.
• Simple plug-in design makes it easy to swap or remove if needed.

Who is this for: The CURT 56261 is suited to Toyota Sienna owners who need a clean, factory-like trailer lighting hookup without modifying their vehicle’s wiring. It’s ideal for drivers towing small trailers, boats, or cargo carriers who want a durable, OEM-compatible solution that installs quickly and keeps the factory wiring intact.