MECMO 4-Pin Trailer Wiring Harness 56217 for Toyota Highlander & Lexus RX — Plug-and-Play 4-Way Flat with Dust Cover

The MECMO 56217 4-pin trailer wiring harness is a factory-fit, plug-and-play T-connector that delivers reliable tail, brake, and turn-signal power for compatible Toyota Highlander and Lexus RX models.

If you tow a small trailer, cargo carrier, or bike rack with a 2008–2019 Toyota Highlander (including Hybrid, Limited, XLE, SE, LE) or a compatible 2018–2022 Lexus RX 350/350L (verify model years and exclusions), this harness provides a factory-style connection without cutting factory wires. Designed as a direct replacement that installs behind the tail lamp, the MECMO 4-way flat connector preserves your vehicle’s original wiring integrity and adds a dust cover and easy-grip socket for everyday durability.

How does the MECMO harness install so quickly?

Installation is plug-and-play: the T-connector plugs into the vehicle’s factory wiring harness behind the tail light—no splicing or special tools required. This minimizes installation errors and leaves factory wiring intact.

• Direct-fit OEM-style T-connector tailored to listed models
• Plugs into pre-wired port behind tail lamp
• No cutting, crimping, or soldering needed
• Includes protective dust cover to keep terminals clean

What trailer lights and functions does this 4-pin connector support?

The MECMO 4-pin flat plug supplies synchronized power for running lights, turn signals, and brake lights—everything required for basic trailer lighting. It’s intended for trailers that do not require a separate reverse or electric brake circuit.

• Tail/running lights powered from vehicle circuits
• Brake lights and turn signals integrated into the flat plug
• Standard 4-way flat for common small trailers and accessories
• Not designed for trailer brakes or auxiliary power feeds

How is the MECMO wiring harness built to resist road conditions?

MECMO uses heavy-duty bonded wire and tin-plated copper terminals for reliable conductivity and corrosion resistance in harsh environments. The connector shell includes easy-grip tabs for secure handling and a protective dust cap to keep contaminants out when not in use.

• Bonded wire construction reduces stress on connections
• Tin-plated copper terminals improve conductivity and resist corrosion
• Easy-grip tabs provide positive insertion and removal
• Dust cover protects pins from dirt and moisture

Which vehicles and model years are compatible with this harness?

This harness is a custom fit for specific model years and trims—confirm compatibility before ordering. It fits 2008–2019 Toyota Highlander models (including Hybrid, Limited, XLE, SE, LE) and select Lexus RX 350/RX 350L years with the factory wiring port; it excludes vehicles with dual exhaust and some other variants.

• Fits Toyota Highlander 2008–2019 (verify trim and factory wiring)
• Fits Lexus RX 350 and RX 350L for listed 2018–2022/2018–2021 years as specified
• Not compatible with dual-exhaust Lexus RX 350L variants where noted
• Always verify your vehicle year and tail light connector type before purchase

Who is this for? The MECMO 56217 harness is ideal for Highlander and compatible Lexus RX owners who need a tidy, reversible, and OEM-like trailer wiring solution for everyday towing of small trailers, cargo carriers, and hitch-mounted accessories. It’s a good choice for DIY installers and pro shops that want a reliable four-way connection without modifying factory wiring. If you require electric brakes, 7-pin auxiliary power, or custom heavy-duty towing wiring, consider a compatible adapter or a different harness designed for those functions.