Oyviny 4-Pin Trailer Wiring Harness for Toyota Highlander & Lexus RX 2008-2021 — Plug-and-Play, Pure Copper

The Oyviny 56217 4-pin trailer wiring harness lets Highlander and compatible Lexus RX owners add a reliable trailer plug without cutting factory wiring.

This plug-and-play wiring kit is built to integrate with 2008–2019 Toyota Highlander models and 2020–2021 Lexus RX 350/350L vehicles that lack a factory tow package. It includes a powered taillight converter and a 4-way flat connector wired with pure copper for consistent signal transfer. The assembly is housed in durable ABS components and protected by rubber dust covers and an inline fuse holder designed to reduce corrosion and electrical faults.

How does this harness connect to my vehicle?

Installation is designed to be straightforward: the harness plugs directly into the vehicle’s existing taillight connector—no cutting or splicing required. The powered taillight converter ensures your trailer lights mirror your vehicle signals correctly.

• Direct plug-in to factory wiring harness
• No need to splice or modify vehicle wires
• Includes inline fuse holder for electrical protection
• 4-way flat connector fits standard trailers

Will this work with my Toyota Highlander or Lexus RX?

The Oyviny 56217 is tailored for 2008–2019 Toyota Highlander models and 2020–2021 Lexus RX 350/350L without a factory tow package. Confirm your model year and check that your vehicle’s factory connector matches the harness plug before purchase.

• Compatible: 2008–2019 Toyota Highlander
• Compatible: 2020–2021 Lexus RX 350/350L (without factory tow package)
• Not required for vehicles already equipped with factory tow wiring
• Verify connector shape and pin layout prior to installation

What materials and protections are included to ensure durability?

Oyviny uses pure copper wiring for improved conductivity and an ABS plastic housing for impact and heat resistance. Rubber dust covers shield the 4-way flat connector and inline fuse from moisture and contaminants, helping prevent rust and short circuits.

• Pure copper conductors for reliable signal transfer
• High-strength ABS plastic housing
• Rubber dust covers for connector and fuse
• Inline fuse holder to guard against overcurrent

What can I expect during everyday towing use?

The powered converter maintains proper brake, turn and tail lamp operation when you attach a trailer, providing consistent signaling and safer towing. The 4-way flat connector supports standard trailer lighting functions without additional modules.

• Supports brake lights, turn signals and tail lamps
• Maintains stable signal integrity under regular towing loads
• Easy access dust cover to keep connector clean between uses
• Plug-and-play simplifies attaching and detaching trailers

Who is this for: The Oyviny 56217 harness is aimed at Highlander and compatible Lexus RX owners who want a clean, reversible towing wiring solution without altering factory wiring. It's ideal for weekend trailers, bike racks with lighting, small utility trailers, and anyone seeking a durable, easy-to-install 4-pin connection for standard lighting functions.