3 Blink Turn Signal

Figured jogging your memory was all it would take haha

The harness/flasher relay that is adapted by the Toyota harness and replaced by the SmartTap has 12 wires going into it. 8 are for flashers and hazard functions. The other 4 are a 30A trailer positive, one to each trailer light, and one that is labeled “ST IN.” Unless there are some jumpers/combined leads on the Toyota harness that makes this all irrelevant, I assume you’ll have to power those trailer lights somehow. Now that I am typing this out though, it seems kinda dumb for an OEM to put out a harness that eliminates being able to legally and safely tow a trailer

 

I don't follow about "powering trailer lights". The 7 pin will have one pin with 12v (or ignition switched) power for trailer batteries, one for the brake controller to modulate trailer brakes and one for reverse lights. The other 4 are standard stop/turn R & L, Parking lights and ground.

Trailer lights are therefore powered either reverse or stop/turn as positive and ground as negative.

Is this harness discussed earlier in this thread? There's some Toyota harness that converts the 4Runner to be able to use the "old school" flasher? I probably need to study up on that if I'm going to add any value

 

Yes it’s the harness @STrooper mentioned. 82241-35010

The 2014-2019 turn signal flasher assembly has the trailer right and left lights routed through it. Spent a bit more time looking and the “ST IN” is from the trailer brake controller so I guess that makes sense. In other words, the lights you mention here:

are controlled via the turn signal flasher assembly. So when the harness supplied by Toyota takes it from 12 populated pins down to the 8 for the SmartTap, something needs to happen to the other 4. If they are abandoned, you no longer have right and left trailer lights so no brake lights, no turn signals. If they aren’t, then there must be jumpers or combined wires somewhere on the harness to maintain control over the trailer left and right lights since the 8 pin SmartTap/CF18 can’t do it without one or the other. Maybe these pics help?

Yes I print out wiring diagrams. I can’t stand trying to follow them on a screen no matter how large that screen is

 

Ok, I’m getting there. And this thing is no go?

https://hidkitpros.com/shop/toyota-oem-82241-35010-relay-wire-harness/

 

I ordered that. Not from that site, but that part number. My concern is if the 30A trailer positive is allowed on the same circuit as the 15A turn/hazard through that harness, the relay on the SmartTap would be the weakest link and therefore necessitate some additional relays. I guess that could be fixed with a lower amp fuse replacing the 30A though. I do not see a throughput rating on Diode Dynamics’ website so it may be an irrelevant concern, but may not be.

The other concern is that the trailer wiring is completely abandoned to maintain the protection of the 15A hazard/turn on the flasher relay.

Either option is not ideal. But not a whole lot more I can do other than speculate until that harness arrives

 

I really don’t follow this part. Turn signals won’t pull anything close to 30 amps. Does the harness disable the tow connector signals? That’s the question of interest.

a flasher doesn’t have any fuses in it. It just flashes.

your only concerns would be open circuits and shorted circuits.

measure current without any harnesses at the tow connector with a trailer hooked up using a meter on the stop/turn bulb. It should be well under an amp.

 

Generally speaking, at least as far as what I know, there is a tow controller which sums brake and turn. That may be a powered module (the OEM ones I’ve used are powered) or unpowered. This is after the flasher. Curt makes an aftermarket one. But current there won’t be much more than the turn bulb draws.

 

Agree with the trailer turn signals should be low draw. The ones that I have are less than an amp. The harness from Toyota is the question mark. It theoretically has to do one of the two things I mentioned, neither of which is ideal. I have no idea why they would put 30A protection on just turn and stop trailer lights (probably includes trailer brakes?). There’s also 30A on trailer battery and 10A on trailer backup lights. Seems like too much for a trailer.

Regardless, the turn signal flasher assembly directly feeds the 7 pin connector according to Toyota’s wiring diagram and it’ll be interesting to see what this harness does

 

Wire harness came in today. SmartTap over the last weekend. Not even remotely close to working. The truck side of the wire harness has 10 wires and the wrong plug. Does not fit the F11 connector coming from the vehicle and is 2 wires short. Could probably make it work if you can source a plug and are ok relying on the 15A turn and hazard fuse for trailer right and left lights. You may also lose trailer brake lights based on wiring diagrams so if that’s the case, additional relays may be in order.

 

Thanks for the update and trying out the different options.

 

Did you took any pictures?

 

Can't find a part number for just the female connector, but on a whim, I searched "Toyota 18 pin connector" and one of the first results was this. It looks to be the right part so for $5 I am willing to chance it. Will report back after Thanksgiving if/when it arrives.

 

Not of the vehicle side of the connector, but here’s the wiring harness vehicle side of the connector. Only 12 slots compared to the vehicle 18 and only 10 populated

 

What year 4Runner you have? I believe that might be the connector for 2014-2019. 2020 plus may be different.

 

I have a 2021 and a 2017. All this has been done on my 2017. 2021 is going to be a lot more complicated since there is a cpu involved. I assume for 4 way flasher on crash…

 

These just arrived! I will install this weekend and report back. Wiring diagram looks simple enough. I will tap the turn signal wires from under the steering column. Hopefully they work as advertised...

 

Thats awesome, hopefully this one is the game changer! Please make sure to take pictures while doing the work for reference and for those who want to do the install as well. We will gladly appreciate the effort!!!

 

Got the correct connector in yesterday. Pinned it up today and, as I expected, some functionality was lost. Using the wiring harness as is did not light up trailer brake lights. Turn signals worked fine with the spliced wires on the harness, but not brakes.

Spent some time adding some 5 pin relays to regain the lost functionality. After doing so, everything works as expected. 4 blinks when tapping the turn signal accompanied by the dash blinking. Hazards have some fun new patterns. All the turn signals are lit when locking and unlocking the vehicle. Oh, and the brakes on trailers work fine.

Currently have that mess just shoved in the dash as it was getting dark (2017 sits in the driveway) but will zip tie it up at some point. Left the OEM flasher relay in place for now. May remove it later and 3D print a bracket for the SmartTap and relays if it rattles too much. Will try to get a video tomorrow and figure out how to post it

 

That’s AWESOME!Thanks for the update, I’m very glad that everything worked out at the end! Looking forward seeing the video and if you don’t mind posting the parts used and where to find them, that would helpful as well!

 

Here’s the video. I realized on my way to drop off my kid this morning that the relays will not work correctly. They are wired in a way that makes the brake signal override the turn signal for the trailer which is opposite of what they should do. Gonna have to think about what I want to do. Need to be able to pull power from a constant source using a trigger for the brake lights and just feed the turn signal output directly to the same light. The only thing I know of that can do that is Diode Dynamics’s solid state switchback relay. I happen to have 2 that I was going to use for a different project, but I may need to commandeer them for this project.

 

Just an FYI as well, I tried wiring the KAHTEC module as well and it did not work at all. I emailed them for help and they said to recheck the connections. I may or may not try a second time as mentally I have given up on this mod.

@Kezin Question for you. When you say 'trailer lights' did you mean when towing something? Or did you mean the tail lights? Great job on the mod by the way! Looking forward to your next update!

 

Yeah when towing. I have a hitch carrier that we frequently fill up past the license plate and covering taillights so I wired it for 7 pin trailer lights. Been using that to test. The brake and turn signal are all one light and I need that to still function correctly. I wouldn’t call the mod “complete” until it works like stock but with added functionality.

I’ll try to post better instructions when I finish it and then you can do it too! So far it hasn’t been too hard. Just a shame I didn’t think through the relays well enough to realize it was going to be the opposite of what it needed to be. The good thing is none of this touches the stock wiring so it should be kinda plug and play after making your own replacement flasher relay module.

 

If one is not worried about trailer functionality (I never tow anything nor do I intend to tow anything in the future) will your mod work? Would love to do this as well!

Looking forward to your specific instructions!

 

Some of you guys have really massive wealth of knowledge to get these electronic things done. If you ever come up with a tutorial please, please make it so that us neanderthals can understand...

 

If you never tow and have no intention of using the tow hitch, you can just re-pin the harness STrooper linked to the F11 connector. Skip everything else I am doing. Do you have any auxiliary wiring plugged into the 7 pin? Like a hitch pod from Diode Dynamics or Meso?

 

Will try to. It won’t apply to your vehicle though since the change in August 2019 deleted the standalone flasher relay. I have a 2021 and a 2017. 2017 is way easier but I’m planning on tackling the 2021 after the 2017

 

So, 2019 model should still be easy to accomplish like the 2017?

 

Yeah. August 2019 is when 2020 MY production started

 

Good to know!

 

Yes I do have the DD hitchpod. Would it be affected?