Aftermarket Plug & Play Harness Compatibility with Tow-Pro Liberty

Affected Vehicles: 2018+ Toyota 4Runner

Part Number: RED24FR

It has come to REDARC's attention that some vehicle models, in particular, Toyota 4Runner MY18+, have implemented an additional diode in-line with their factory tow package harness (i.e. the electric trailer brake controller connector, brake light trigger circuit). This diode has been introduced to eliminate any positive back feed being applied to the vehicle brake light circuit, in the event of the electric trailer brake controller emergency over-ride being applied.

This additional vehicle diode, if connected with an aftermarket plug & play vehicle-specific brake controller harness with a diode, causes the brake light trigger voltage to be lower than the voltage at the Tow-Pro Liberty battery input (BLACK wire) by 1.5 Volts or more, which will result in the Tow-Pro Liberty not calibrating.

It has been determined that Tow-Pro Liberty's (Part Number EBRH-ACCNA) manufactured with a serial number starting with 2006xxx, 2007xxx or 2008xxx may be affected by this issue. Please refer to the small white label on the side of the Tow-Pro Liberty main unit for your serial number.

Changes are currently being made to the Tow-Pro Liberty to eliminate this issue. In the meantime, if your Tow-Pro Liberty does not calibrate, please contact REDARC directly for a replacement and free of charge plug & play harness that will overcome this issue.

Phone: USA +1 (704) 247-5150, Canada +1 (604) 260-5512 or Mexico +52 (558) 526-2898

Email: power@redarcelectronics.com

Locating the Product Serial Number

The image below indicates where the Product Serial Number is located on the Main Unit and on the Product Packaging.

The Serial Number Label contains the Part Number (circled in BLUE below) and the Serial Number (circled in RED below). The first 4 digits of the serial number indicate the YEAR and MONTH of manufacture, in the form YYMM.

Updated On: 10/15/20

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