Yep, this cable I got from the link you posted. Here's a shot of Cable C — and the locking tab seems to face the opposite way from Cable B.
2025 OT+ AUX Switches wiring
- Thread starter cbra928
- Start date
Thank you for confirming this. I will let the ebay seller know and see if he can build one with the locking tab oriented properly. I will also see if he can color code properly also. Thanks!
I am thinking — would it be possible to remove the terminals from the eBay harness and insert them directly into the factory connector (Cable C) in the engine bay?
The idea is that since the eBay harness doesn’t physically fit Cable C due to the opposite locking tab, maybe I can just re-use the terminals by inserting them into the original factory connector, assuming the pin type and spacing match.
Here's a photo showing the connector mismatch — the tab orientation is reversed, but the pin structure looks pretty similar.
Attachments
That is a good idea. I would say for sure that would work. But I am not sure how to remove them. I know they make the pin removal tool for a Deutsch connector, but no clue on these. The other thought would be to file down the locking tab on the ebay connector.
I sent message to the seller and will post what he says also.
Nice! Did the ends remove through the holes as stated by Garauld above? This looks like the best work around at this point in my opinion. Looks pretty slick too. Nicely done!
You need to pull out the white cover from the connector first, then use a pair of tweezers or another suitable tool to lift the locking tab while pulling the wire out at the same time.
I am just thinking right now about whether the wires with different colors correspond to the correct ports.
Made a video of my project and how i did the AUX switches
Great instructions as always! The connector on the vehicle does show the black and white common ground wire that would pin in to the connector next to your aux 1 connection. Why did you choose to not use?
Decided it was easier to ground the lights on the chasis of the vehicle. That connector is a pain. Lexus could have done better
Do you know where the Aux 4 (D on diagram) connector is located? Under dash somewhere? So two connectors under dash?
I have a roof rack arriving shortly that needs a light bar. Also, did they run the wiring to the roof up the wide channel on the side of the windshield? Thanks
Aux 1 and Aux 2 on driver side front under hood. Aux 3 and Aux 4 on passenger side front under hood. Watch the above video and it will be extremely clear. Other connector under driver seat.
Color coding will be same on each connector based on the Lexus manual and will carry over to each connector.
It seems the 2025 4Runner Trailhunter and some PRO models also have a similar Aux setup as the 2025 OT, with the Aux 1 @40 A, Aux 2 @20 A, Aux 3 @15 A, Aux 4 @10 A. In reading some of the 4Runner G6 forums many, but not all, these models are coming with the pigtails in boxes, made in Mexico. I should have my 25 OT in about a month and will see if the Toyota pigtails work on the GX, if Lexus does not have them yet. The Toyota pigtails are different sizes for Aux 1 & 2 than 3 & 4 since they have more amps. The Toyota part numbers are:
PT974-89251
Hi AUX Wire Harness
PT974-89252
Low AUX Wire Harness
One is for Hi Aux 1-2, the other is Low Aux 3-4. Wonder when Lexus will have the pigtails ready, but just maybe the Toyota ones will work. The only downside would be that the wire colors are slightly different for the assigned Aux #'s.
PT974-89251
Hi AUX Wire Harness
PT974-89252
Low AUX Wire Harness
One is for Hi Aux 1-2, the other is Low Aux 3-4. Wonder when Lexus will have the pigtails ready, but just maybe the Toyota ones will work. The only downside would be that the wire colors are slightly different for the assigned Aux #'s.
Based on the wiring of the caps that MandR did, building our own pigtails has worked out perfectly. Watch the video if you can. The only difference that I did, was wire to the common ground in the pigtail rather than grounding on the chassis like mandr did.
Hi All, first time poster.
Can confirm that the Toyota pigtails fit and are wired exactly the same as these. Just used the smaller one to fit some ditch lights to my OT. I'm 99% sure that the wire coloring and fuse specs are also identical. I used the aux 4 wiring and I was able to plug the setup into are 4runner trailhunter and that vehicle also activated the lights using the aux 4 button.
📷 Lexus GX 550 Random Images
📷 Lexus GX 550 Random Images
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