Originally Posted by q451990

I'd say it depends on what kind of signal they're sending to the LED units to change them to high beam. I'm pretty sure there's a solenoid operated shutter in them that lifts up to open the top part of the lens. If it's just a "send 12VDC (or Ground) to the light during high beam operation" type of setup you'd just have to pick that up to feed a relay. The new relay would feed new connectors to the 9005 bulbs. Now, if they're feeding the headlights with some kind of LAN signal, all bets are off.

Originally Posted by 2021nightshade4x4

- In the 4Runner with Bi-LED? No.
There is no SOUND outside the vehicle when switching from low to hi beams. And the change happens in an instant. Hi beams are achieved by lighting ADDITIONAL chips in the same housing. I venture to say that’s why performance is so poor.

- In my 2012 Range Rover? Yes.
- In my 2012 Chevy Volt? Yes.
Both of these vehicles have a “knock” sound when switching to high beams, there is a physical “eyelid” that raises the cutoff to create a full beam. If you look closely you can see the transition of the mirror lifting the cutoff line. This is NOT what happens in the 4Runners.


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Originally Posted by ElectroBoy

Toyota shows the three wiring variations for halogen/LED high beams in the diagram, designating the wires with (*) which makes it a little confusing at first glance.

Originally Posted by q451990

We took delivery of a '22 Limited last week to replace our '17. I spent a good bit of time with the '17 to integrate the LED fogs into the factory system. It definitely used a PWM scheme to operate the halogen high beams at partial brightness.

I read about some people trying LEDs in a '21 that came with LED headlights, and only uses halogens in the inner bulb location for DRLs. They noted that one LED bulb will work, but the other one would not, and that's as far as I saw it investigated.

I got out the multimeter, and found that Toyota has simplified the DRLs on the newer models, and are running 9005 bulbs in series to achieve half brightness, rather than PWM. This makes sense as the 9005s are no longer used as high beams. Battery voltage goes to the right bulb on the green wire, the negative pin on the right side feeds the positive side on the left bulb through the pink wire, then the left bulb grounds through the white/black wire on the left side.

Maybe this has been mentioned somewhere, but I didn't find it. I'm going to make up a sub-harness to send full battery voltage and ground to both bulb locations, and install LED 9005 bulbs. I'll post more when I'm done with that project.

I'm looking for some 9005 LEDs that are fanless, and relatively underpowered, so I'm not blasting everyone with super bright high beam DRLs all day. Does anyone have any thoughts on these?

9005 HB3 LED Bulb Kits Fanless Design｜Lasfit

or

Diode Dynamics 9005 HP48 LED Bulbs

Originally Posted by q451990

I was a little vague on how to pick up the wiring, because Toyota seems to customize things between trim levels, and I would hate to be responsible for toasting someone's lighting system. But with the disclaimer that you should confirm everything with a multi-meter, and don't hunt me down if you fry something - here's what I did.

I bought an extension harness like this. Amazon.com: iJDMTOY (2) H11 H8 H9 Extension Wiring Harness Sockets Wires Compatible With Headlights or Fog Lights Use : Automotive

and modified them like this:



So the only wire I added is the black wire that takes ground back from the left side to the right side. I'll try to take some pictures of the harness at some point, but it may not look like much since the connections are covered in heat shrink and flexible tubing.

I will also mention that the aftermarket harness that I bought had the red and black wires reversed from the way Toyota does things, so I had to de-pin them and swap them. You could just use red for ground and black for hot if you didn't want to take the time to do that - or the one you buy may be set up correctly.

Originally Posted by q451990

I was a little vague on how to pick up the wiring, because Toyota seems to customize things between trim levels, and I would hate to be responsible for toasting someone's lighting system. But with the disclaimer that you should confirm everything with a multi-meter, and don't hunt me down if you fry something - here's what I did.

I bought an extension harness like this. Amazon.com: iJDMTOY (2) H11 H8 H9 Extension Wiring Harness Sockets Wires Compatible With Headlights or Fog Lights Use : Automotive

and modified them like this:



So the only wire I added is the black wire that takes ground back from the left side to the right side. I'll try to take some pictures of the harness at some point, but it may not look like much since the connections are covered in heat shrink and flexible tubing.

I will also mention that the aftermarket harness that I bought had the red and black wires reversed from the way Toyota does things, so I had to de-pin them and swap them. You could just use red for ground and black for hot if you didn't want to take the time to do that - or the one you buy may be set up correctly.

Originally Posted by chriamab

Is a plug and play LED option available? I'm curious on why a LED bulb cannot be used as a DRL, when the DRL is no longer integrated into the high beams on the 2022 models? Is there just not enough power output getting sent to them? I'm not well versed in electronics at all, so sorry if this is a dumb quesiton

Originally Posted by DesertDune4x4

Same question as above. Any interest in building and selling a kit?

Originally Posted by chriamab

Is a plug and play LED option available? I'm curious on why a LED bulb cannot be used as a DRL, when the DRL is no longer integrated into the high beams on the 2022 models? Is there just not enough power output getting sent to them? I'm not well versed in electronics at all, so sorry if this is a dumb quesiton

Originally Posted by q451990

The problem is how Toyota has these wired. They ran two regular light bulbs in series to make them dimmer. As far as I know, there aren't any plug and play LEDs that work well in this environment.

Originally Posted by q451990

It's tempting, but without understanding all of the variations available from Toyota, I'd be concerned about some kind of "unintended consequence" issue cropping up.

Originally Posted by WonderingWhyToo

How about an ELI5 (Explain me Like I’m 5) step by step breakdown? I’ve ordered the harness you linked in but I’m afraid I’m missing something. I’d even pay for step by step instructions if you willing. Please brother.