Lights on when wipers on automatically?

Forgot to say "Back in my day" sorry, lol

 

Finally got some lights put back in my truck. This isn’t the best example, because it disconnects my DRL, which has to be addressed here as well, but you can see that by just adding ground to the low beam only, the parking lights come on as well.


And yes, one of my tails is dark I had a small battle with my VLED bulb and a set screw. Finally won it, but haven’t put the bulb back.

The issue that needs to be addressed with the DRL is that if the stalk is set to DRL and the lights are turned on via an external ground trigger, the DRL will stay on. So you have DRL on while low beams are on. When I finalize a few more things, I can plug the original Turn/DRL bulb into mine and demonstrate it. That might be different on the TRDs, but I doubt it as the stalk functions the same. People may not care if the DRL stays on with the low beams during rain as well, who knows?

 

Assembly error. The only way ground would be "accessed" by the tails is if you are going through the lights stalk. Light stalk needs to be left alone, original, no selecting any mode. The selecting of the wipers is what acts as a some what parallel light stalk WITHOUT the internal combo feature the OEM light stalk has.
OEM low beam select cuts off the DRL. That is an internal ECU thing. You would need to have it on its own control circuit, something I guess no one wants. (Unless upgrading the SR circuit)

 

Assembly error? How so? It is a stock stalk, just with a tee accessing low beam, parking, DRL, and turn signals. It does EXACTLY what you are proposing by adding a ground signal to the low beam pin, but not adding it to the parking because that is redundant. I can add an additional ground like you suggest, and no more lights light up because they are already lit up. Those pictures are the stalk off, just adding ground to low beam (the yellow one, pin 19 IIRC?) on the stalk. And OEM low beam does NOT cut off the DRL if ground is still applied to from the DRL stalk switch to the ECU. You'd think it would, but it doesn't. I can't demonstrate that on my truck as it is because I did build a separate DRL circuit, but the stock one is still there, I just don't have any bulbs on it. I will grab one though and wire it up if you want to see it. But I don't know what other proof you need besides the diagram and pictures of it actually doing what I said it would do But, if you really don't trust me, then at least add diodes to your diagram so the low beams don't turn on when you turn the stalk to parking lights. It won't hurt to have both hooked up (with diode separating them), but it isn't required at all, as the outcome is exactly the same.

 

Here is what is going on in those pictures (the one with all the parking lights lit up)

I just eliminated the relay and the parking tap. I could run it through a relay for you if you really think the result would be different (spoiler: it won't be).

 

I just verified, the stalk has an internal jumper (with/without selecting) so when you provide ground, you do so to both circuits. With/without selecting ground via the stalk.
All OEM Taco's loose DRL when Low Beams are selected.
The point being standout when the wipers are selected, the delay relay was so it doesn't activate the parking & lows when mist is selected or bumped.

 

Yeah, I would definitely do a delay. But to the stalk, if you test for continuity between the ground pin 15 and the low beam 19, you will have continuity there if the stalk is set to low beams. But without changing the stalk, you will also have continuity between 15 and 18. As to the DRL, I’d love to test it on a TRD. I’ll see if someone in the Denver area will allow me to tinker on their truck. I was surprised that it did that on the SR. I can actually verify pretty easy if I just plug a VLED light in where my resistors are plugged in. They are plugged into the DRL/turn wire and the ground from that plug. I’ll try to do that tomorrow.

 

Where is the connector that you are grounding pin 19 at? Will this work if the switch is set to auto?

 

The connector is at the base of the stalk switch, where you turn the headlights on. If you pull the 2 screws hidden by the steering wheel (you'll see them as you spin the wheel), the bottom cover pops off. Look where the stalk meets the steering column, and you'll see the connector.

Yellow wire is 19 (low beam). As to if it will work with AUTO, It should, but I've not tested that. It will for sure simulate turning the headlight stalk to "low beam", I am just not positive what it will if the auto function went to turn on the lights. On the SR without auto headlights, if the stalk is set to DRL and you ground pin 19, the DRL stay on. I got around this by breaking the signal from pin 20 going from the stalk to the ECU so the DRL turn off when the headlights are on. If you'd like to test a few things, I would be willing to send you a tee harness to tap that connector. Let me know.

Also, just so you know that I do have some experience with this, I added auto headlights to my 2019 SR (that was before they became standard in 2020). You can see it here:
What Have You Done To Your 3rd Gen Today? | Page 13316 | Tacoma World
The picture shows the stalk in the "off" position while the low beams are on. With my set up though, the headlights are automatic regardless what setting the stalk is set to. If I want to disable the auto feature, I have a switch to do that:

 

Johnny, you have a 2019 SR that has the OEM Auto headlights with light sensor?

 

Some people are stupied

"Why do my wiper blades turn when my head lights turn on"
not knowing they're is an auto and causing and accident or somethung stupid

A lot of people only believe what's on there phone