Troubleshooting Difficulty Calibrating The Redarc Tow-Pro Liberty

Question

Question:

Calibration issue with Tow-Pro Liberty in 2021 Toyota 4Runner. I recently installed the Tow-Pro Liberty into my 2021 Toyota 4Runner using the RED49FR TPH-021 harness. After install, the break controller will not calibrate. I have seen a few things online about why this may be happening but wanted your opinion. One reason I have heard is that there is a diode built into the RED49FR harness AND there is a diode that is in the Toyota 4Runner trailer break plug. This is causing the voltage to be too low and is why calibration wont happen. I have also seen some people say they need to add a diode to the harness to make it work. So I am a little confused as to what the problem is and how to fix it. Any recommendations would be helpful.

asked by: Matt

0

Expert Reply:

We have never encountered a case of a 4Runner needing a diode in order to use the Redarc Tow-Pro Liberty # RED24FR. If you suspect voltage is low you could always go in and test with a volt meter.

The Redarc Encapsulated Power Diode # RED34FR is generally only needed on vehicles with certain advanced safety systems like the Adaptive Cruise Control, Assisted Emergency Braking and Autonomous Emergency Braking. Since you are using the plug-and-play pigtail # RED49FR you should not need any additional components.

We do suggest that you make sure that the controller is mounted securely in a fixed location. The controller can be installed in any orientation, but it cannot move, as this can throw off calibration.

Also, sometimes the calibration process can take time. Sometimes you will need to speed up and slow down repeatedly up to 20 or 30 times in order for the unit to fully calibrate. Also, if no trailer is connected, the unit will calibrate without any indication from the LED. We suggest disconnecting the controller from power, then plugging it back in and re attempting calibration. Even better if you can do this with the trailer connected.

expert reply by: Jesse M

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Answer 1

The easiest way to determine what could be causing the issue with your Redarc Tow-Pro Liberty Brake Controller #RED24FR, installed in your 2022 Toyota 4Runner using the Plug-and-Play Wiring Harness #RED49FR is to check the fault code chart in the…

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Answer 2

If your Redarc Tow-Pro Liberty Brake Controller #RED24FR doesn't have the light lit up then you likely have no power getting to the controller (see attached from manual). What you will need to do is check the black wire from the 4-wire pigtail at…

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Answer 3

The Redarc Encapsulated Power Diode #RED34FR shouldn't be needed for installing the Redarc Tow-Pro Liberty #RED24FR and Pigtail #RED69FR on your 2020 Subaru Forester. The answer page you're referring to didn't have us telling someone to…

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Answer 4

When it comes to installing The Redarc Tow-Pro Liberty #RED52VR if there is no trailer connected, the active calibration may occur as normal without any indication from the LED., provided your brake light trigger point is active when there is no…

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Answer 5

In regards to the Redarc Tow-Pro Liberty Brake Controller part ##RED24FR, the unit should not be illuminated while driving without a trailer. If you press the button while a trailer is not attached you should see a breathing blue light and that…

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Answer 6

The Redarc Encapsulated Power Diode #RED34FR is only needed on vehicles with certain advanced safety systems like the Adaptive Cruise Control, Assisted Emergency Braking and Autonomous Emergency Braking. If your 2016 Toyota Highlander has these…

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Answer 7

The light breathing or "pulsing" on your #RED24FR is an indication that the trailer brakes have not been detected or the trailer has not been plugged in. Since it sounds like you were testing the brake controller and you weren't hooked…

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Answer 8

Like most other brake controllers do, the Draw-Tite Activator IV, part #5504 sends a small test pulse of voltage through the brake output circuit to confirm that the trailer is plugged in and that the brake magnets are receiving the signal. This…

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Answer 9

The flicker you are seeing on the brake output circuit of your vehicle is normal. Brake controllers will lightly pulse their output circuit to check to see if a trailer is connected due to the amperage draw of the brake magnets. So what this all…

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Answer 10

Your 2017 Lance 1475 has the Dexter #10 torsion axle. The lift kit for that axle is #K71-707-01. This will lift your trailer frame by 2-5/8 inches you requested.

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Answer 11

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 12

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Troubleshooting Difficulty Calibrating The Redarc Tow-Pro Liberty

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