Trailer Break Override triggers ABS and VSC dash light

No response yet from Hopkins on this issue. My last email to them went unanswered.
I tried to see if my scangauge would recognize any codes. Nope.
I may have to get the warning lights and drive straight to the dealer to read codes in hopes that Toyota may do something to correct this.
 
Any luck? Just wondering if I should proceed with a diode install or order new harness. Have you figured out why you couldn't get the wheels to lock? I am having same issue. Thanks.

Sorry. Didn't get it installed.

In looking at the new harness, there seems to be something (I expect a diode) in line on the red wire. Will install and test this weekend for sure...
 
I installed the new harness I received directly from Tekonsha today and it seems to have resolved the issue. No codes on manual override activation.

It appears that a diode is installed on the red wire.

Finally a solution.

Onward!
 
Same problem (ABS and VSC) with Curt Brake control

Hi !

I transfered my Curt 51130 brake controler from my 4Runner 2003 to my new 4Runner 2017. When I push the manual control for 3-4 seconds, the ABS warning and Slip indicator on my dashboard light ON. What's wrong ?

Regards

My setup :
2017, Toyota 4runner 2017 Limited
Curt 51130 brake control
Curt 51362 Wiring Harness
 
Hi !

I transfered my Curt 51130 brake controler from my 4Runner 2003 to my new 4Runner 2017. When I push the manual control for 3-4 seconds, the ABS warning and Slip indicator on my dashboard light ON. What's wrong ?

Regards

My setup :
2017, Toyota 4runner 2017 Limited
Curt 51130 brake control
Curt 51362 Wiring Harness

Don't take this the wrong way, but did you even bother to read through the thread? The problem is you need to have a specific diode installed.


I just had an email conversation with their tech support - The short version is that I asked what was different in the new harness, the answer is a 1 amp diode (any voltage above 15v should work) installed in the red line...
I am not going to order a new harness, I'm just going to add a diode.
Here are some diodes that would work fine:
Amazon.com: Install Bay Diodes 3 Amp 20 Pack- D3: Car Electronics
While $5.43 is cheap in general it's expensive for diodes... but it certainly is easy to get them this way!

Full email thread with headers removed below:

The following message has been sent from the Tekonsha website on*Wednesday, June 17, 2015:
Attention:
Technical Support
From:
Andre Xxxx (*xxxxx*)
Contact Number:
716-xxx-xxxx
Subject:
VSC/ABS light on when using P3 and adapter harness
Message:
Hello,I recently installed my P3 in my Toyota 4Runner. When using the manual brake activation lever sometimes my ABS and VSC lights come on. They go off after the vehicle is turned off and back on.I have taken it to my Toyota dealer who could find no problem with the vehicle...What should I do?

On Jun 17, 2015, at 1:20 PM, Danny Dunn wrote:
*
Andre,
*
Thank you for contacting Tech Support. We are in the process of making a brake control harness for the 2014-2015 4Runner, it should be available the first or second week of July. We had only heard of an issue on the 4Runners, like this, about two months ago. We are trying to expedite the manufacturing of the harness. It will have a diode in the red wire to prevent back feeding into the brake light circuit of the vehicle. The Tekonsha 3041 is not available yet. I will keep this email, and inform you when the harness is ready.
*
*
Best Regards,
Dan
*
Danny Dunn
Technical Service Coordinator
Cequent Performance Products (Electrical Division)
101 Spires Parkway
Tekonsha, MI.* 49092
(888) 785-5832

Dan,
Thanks for the reply…
Could you provide the value of the diode? I would be more than happy to just modify my current install… I’d dislike buying the same harness twice for the pennies it would cost to solder in a diode and add some heat shrink to it…
Thanks!
Andre

Andre,
*
We are using a 1 amp diode in our harness.
*
Dan
 
In what direction should the diode be installed on the red wire to correct the back feed?

Sent from my SM-G900V using Tapatalk
 
You can do it!

photi-albums-trailer+brake+harness+mod-picture33836-unmodified-harness.jpg


photi-albums-trailer+brake+harness+mod-picture33830-red-wire.jpg


photi-albums-trailer+brake+harness+mod-picture33831-harness-section-removed.jpg


photi-albums-trailer+brake+harness+mod-picture33832-heat-shrink-cut-diode.jpg


photi-albums-trailer+brake+harness+mod-picture33833-soldering-diode-into-harness.jpg


photi-albums-trailer+brake+harness+mod-picture33834-diode-installed.jpg


photi-albums-trailer+brake+harness+mod-picture33835-heat-shrink-added.jpg


No more codes!

++++

+++++

Yes, it works ! I bought this diode and I do it ! And the most important... everything is good !

** 1N5401 (3A, 100V) 1N5401 General Purpose Diode: 1N5401 - 1N5401 100V 3A General Purpose Diode

Many thanks Photi ;-)
 
I have a Curt Discovery brake controller installed. My ABS and VSC light came on after using the manual override switch. Also, the little green truck indicator for the multi-terrain select was flashing. After I disconnected the trailer and turned off the 4Runner all lights were gone next time I started the vehicle. I am going to try the diode idea and hopefully that fixes this issue. Would anybody happen to know if the ABS and VSC systems still work when these lights are on or are these systems disabled?
 
++++

+++++

Yes, it works ! I bought this diode and I do it ! And the most important... everything is good !

** 1N5401 (3A, 100V) 1N5401 General Purpose Diode: 1N5401 - 1N5401 100V 3A General Purpose Diode

Many thanks Photi ;-)

This worked great for me on my 2016 TEP 4runner. I used Toyota OEM connector and used same diode. I made a pig tail when I was connecting the white ground wires together and connected to a screw under the dash. The manual control lever on prodigy p3 worked great going down 6% grade downhill, its a must have control. I'm towing 17' Casita trailer and controller is set at 6.5 with the booster off. Not sure if it's an optimum setup yet.
 
2019 bump.... I'm just about to install the P3 I used in my 07 FJ with no problems (obviously some major electrical differences with the 2019 4R). But finding space for the P3 kinda limited so about to order the 3 piece Hopkins unit. Now this whole code throwing stuff...anyone with a 2017 or newer, using the Toyota supplied harness having an insight to codes, resolutions etc. I have read all posts since page one.....a lot of info on 2014ish 4R's.
 
I have a Curt Discovery brake controller installed. My ABS and VSC light came on after using the manual override switch. Also, the little green truck indicator for the multi-terrain select was flashing. After I disconnected the trailer and turned off the 4Runner all lights were gone next time I started the vehicle. I am going to try the diode idea and hopefully that fixes this issue. Would anybody happen to know if the ABS and VSC systems still work when these lights are on or are these systems disabled?


Did the diode / new Tekonsha wiring harness fix the problem? I just installed a brake controller this evening, and am having the exact same problem. I am using the Toyota OEM wiring harness, and it blows me away that Toyota would ship a wiring harness that causes they types of issues. Stupid Toyota.

Also, does the Tekonsha 3040-S wiring harness also have the diode, or just the 3041-P?
 
Did the diode / new Tekonsha wiring harness fix the problem? I just installed a brake controller this evening, and am having the exact same problem. I am using the Toyota OEM wiring harness, and it blows me away that Toyota would ship a wiring harness that causes they types of issues. Stupid Toyota.

Also, does the Tekonsha 3040-S wiring harness also have the diode, or just the 3041-P?


After speaking with Tekonsha, Etrailer, and Redarc, I was able to confirm that this is a known problem with the 4runner (although Toyota will not admit it, or do anything to fix it). The 3040-S wiring harness does NOT have the diode, and while the 3041-P does, the diode is very close to the harness end so if you cut it for use with another brake controller, you will likely cut the diode. eTrailer.com recommended I purchase the following standalone diode and wire in line with the "red" wire. I'll update once I have it installed and confirmed it fixes the issue.

Roadmaster Single Park Light Diode Roadmaster Accessories and Parts RM-690
 

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