Is The Redarc Encapsulated Power Diode # RED34FR Needed On a 2016 Toyota Highlander W/ Redarc Elite?

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Question:

Having a problem how to hook up the red arc encapsulated protection device kit Does my highlander need this if so where do I wire it into

asked by: Terry

0

Expert Reply:

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 features the Diode will need to be installed into the harness for the Redarc Tow-Pro Elite Trailer Brake Controller # RED44FR. I have included an image with the wiring that will need to be connected.

expert reply by: Bud M

0

Redarc Encapsulated Power Diode # RED34FR Wiring
(click to enlarge)

Mtn

9/4/2025

Thanks for this diagram. I went to install this on our 2023 Sienna and wondered about the "extra" red wire (right). This made it make sense. Thanks!

Jameson C.

9/4/2025

@Mtn Glad we could help!

Answer 1

Hello Dan, We can most definitely get you set up to use your Redarc Tow-Pro Liberty brake controller in your 2022 Toyota Highlander. Since you were looking at the #ETBC7, I’m assuming your Highlander does not have the factory tow package. To equip…

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Answer 2

Before you can install a trailer brake controller in your 2022 Toyota Highlander you'll first need to make sure that you have a 4-pole wire harness for your lights installed and then a 7-way wire harness to get your brake function. If you…

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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

No, you do not Jeff. The Redarc Tow-Pro Trail Brake Controller w/ Custom Harness item #RED74UR is a plug and play setup for your 2022 Toyota 4Runner. It already has the necessary wiring and diodes so the item #RED34FR diode is not needed. What kind…

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Answer 5

Hey Brendan, for your 2016 Toyota Highlander you would want the Redarc Tow Pro Liberty part #RED52VR which comes with the universal wiring harness and then for a dash mount you would want the part #331-TPSI-002. To install this we don't have any…

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Answer 6

Hello Greg, thanks for reaching out. The Redarc Tow-Pro Link Bluetooth Brake Controller #RED57AR will work great on your 2026 BMW X5 X40i with the factory tow package. We list it for vehicles without the tow package since it comes with a universal…

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Answer 7

Yes you need the diode arrow to point towards the brake controller. That will allow the voltage to travel into the controller but not backfeed back on to the Highlander in any way. If you need a diode we have the part #RM-690.

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Answer 8

Hey Paul! Does your 2025 Toyota 4Runner have the factory tow package? If it does, there is a brake controller port you can use for plug and play installation. If you're using the Tekonsha POD #TK92UR you got before then you need the Tekonsha…

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Answer 9

Hey, William! No cause for concern! The 4th wire on the Redarc harness part #RED93RR is for the California Vehicle Code 26458. This compliance means that when you press the manual override on the brake controller (to apply trailer brakes without…

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Answer 10

While I can sympathize with your issue, it is not safe to tow a trailer if you only have a 2" hitch ball and your trailer coupler is designed for a 2-5/16" hitch ball, even for a short distance; the insecure connection between hitch ball…

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Answer 11

Hi Pete; the #RED44FR installation video doesn't actually show the typical connection to the brake light trigger using the red wire since they ran extra wire and routed it to the back. You can follow the video or you can identify the cold side of…

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Answer 12

Hey Rob, thanks for reaching out! The unibody definitely can be a problem, especially when the owner's manual discourages it. I get the concept behind the Anderson WD hitch, but frankly I'm a little skeptical of it myself, so I have some…

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Is The Redarc Encapsulated Power Diode # RED34FR Needed On a 2016 Toyota Highlander W/ Redarc Elite?

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