MECMO 4-Way Trailer Wiring Harness 56083 for Toyota Highlander & Lexus RX — 4-Pin Flat, Plug-and-Play

This wiring harness is built specifically for compatibility with certain Toyota Highlander and Lexus RX models that come equipped from the factory with a tow package. It avoids splicing or complex wiring by mating directly to the OEM trailer connector, and includes a rubber dust cover to protect the trailer socket when not in use. Before ordering, confirm your vehicle has the factory tow package and the pre-wired connector under the driver-side bumper.

How do I know this harness will fit my vehicle?

Fitment requires a factory-installed tow package on the listed models. You can verify compatibility by checking for a black square tail light signal control module or locating the pre-wired connector under the driver-side bumper, or by contacting a dealer with your VIN.

• Compatible vehicles: 2020–2024 Toyota Highlander (factory tow package required)
• Also fits: 2010–2023 Lexus RX350 & RX450h, 2018–2022 Lexus RX350L (factory tow package required)
• Confirm by VIN with Toyota/Lexus dealer or physical inspection under the driver-side bumper

What does the MECMO 4-pin flat connector power and how is it installed?

The harness provides standard 4-way flat outputs for tail lights, brake lights, and turn signals so your trailer’s basic lighting works from the vehicle’s existing circuits. Installation is a simple T-connector design that plugs into the vehicle’s OEM trailer wiring socket—no cutting or splicing is necessary when your vehicle has the proper factory tow package.

• Provides tail, brake and left/right turn signal outputs
• Plug-and-play T-connector mates to OEM trailer wiring port
• No wire splicing required when used with factory tow package

Will the harness withstand outdoor and towing conditions?

The MECMO harness is made for vehicle-side durability and includes a tight-fitting rubber dust cover to shield terminals from moisture and debris. That dust cover helps reduce corrosion risk at the socket, and the wiring and connector are designed to sit securely beneath the bumper when routed properly.

• Durable vehicle-side wiring built for bumper-area mounting
• Rubber dust cover protects socket from water and dust
• Connector designed to fit OEM trailer connector location cleanly

How do I confirm and prepare my vehicle before purchase?

Confirm the factory tow package is present either by a VIN check with a dealer or by visually inspecting the driver-side rear bumper area for a pre-wired trailer connector. If you don’t find the OEM connector and control module, this harness is not compatible—aftermarket tow kits or professional installation may be required for towing capability.

• Contact Toyota/Lexus dealer with VIN to verify factory tow package
• Look under driver-side bumper for pre-wired connector port and black tail light signal control module
• If no factory tow package, consider an OEM installation or an alternate wiring kit

Who is this for: The MECMO 56083 4-way trailer wiring harness is designed for owners of 2020–2024 Toyota Highlander and specified Lexus RX models who already have the factory tow package and need an OEM-style, no-splice solution for powering standard trailer lights. Choose this harness if you want a straightforward plug-in connection, protection from the elements with a rubber dust cover, and a tidy factory-compatible wiring option for routine towing tasks.