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RX - 4th Gen (2016-2022) Discussion topics related to the 2016 and up RX350 and RX450h models

!! Unpluged wire behind the grille !!

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Old Jul 28, 2021 | 07:20 AM
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Default !! Unpluged wire behind the grille !!

Hi everyone,

In my 2016 Lexus RX450H, I found one unpluged wire exactly behind the grille, and I couldn't figure out where it should be connected to. Could you please check the photos I uploaded and tell me what is this wire for ? Could you also please check your cars and share with me some photos of this wire (if you find it in your cars), in order to know where I should plug it.

Thank you all .......
Attached Thumbnails !! Unpluged wire behind the grille !!-img_0111-2.jpg   !! Unpluged wire behind the grille !!-img_0113.jpg   !! Unpluged wire behind the grille !!-img_0118.jpg   !! Unpluged wire behind the grille !!-img_0117.jpg   !! Unpluged wire behind the grille !!-img_0121.jpg  

!! Unpluged wire behind the grille !!-img_0115.jpg   !! Unpluged wire behind the grille !!-img_0122.jpg  

Last edited by Iyad; Jul 29, 2021 at 12:11 PM.
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Old Jul 29, 2021 | 05:00 AM
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Is there anything that doesn't work or any fault indicators? Radar cruise working? Outside temp reading okay?
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Old Jul 29, 2021 | 12:15 PM
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Originally Posted by toyotaman7
Is there anything that doesn't work or any fault indicators? Radar cruise working? Outside temp reading okay?
Everything works fine in my car (front cam, radar, outside temp......etc), and I don’t have any error message shown on my dash.
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Old Jul 29, 2021 | 01:16 PM
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Originally Posted by Iyad
Everything works fine in my car (front cam, radar, outside temp......etc), and I don’t have any error message shown on my dash.
Then, by logic, it is there to power a feature not installed on your vehicle.
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Old Jul 29, 2021 | 02:11 PM
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Originally Posted by dibl
Then, by logic, it is there to power a feature not installed on your vehicle.
I disagree for 2 reasons. First, my car is top of the range. It has all the possible features for this model, in its region, and there are no way to add anything more to it. on top of that, Lexus engineers are not stupids to let any electric wire be exposed to those daily harsh weather factors, in this careless way. I’m pretty sure that it should be pluged some where. Would you please have a look at your hybrid cars and check where it’s connected to ?
Thanks for your cooperation guys
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Old Jul 29, 2021 | 02:17 PM
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Originally Posted by Iyad
Hi everyone,

In my 2016 Lexus RX450H, I found one unpluged wire exactly behind the grille, and I couldn't figure out where it should be connected to. Could you please check the photos I uploaded and tell me what is this wire for ? Could you also please check your cars and share with me some photos of this wire (if you find it in your cars), in order to know where I should plug it.

Thank you all .......
Perhaps for the outside temperature sensor? On my old RX (and perhaps my newer one) it was mounted in front of the radiator. Does your RX display the outside temperature?
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Old Jul 29, 2021 | 02:57 PM
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What colors are the wire? Perhaps then someone with access to the electrical schematics could chime in.
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Old Jul 29, 2021 | 06:27 PM
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I agree with dibl. Just look at how corroded the terminals are. It's been disconnected, er, not in use for quite some time. Do you have the cold weather option?
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Old Jul 30, 2021 | 08:44 AM
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perhaps an item/option for other markets...ie...Canada or US. Some areas require or offer or require items that other markets do not.
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Old Jul 30, 2021 | 09:04 AM
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I don't see anything unplugged like that on my 2021. Of course, my example is a newer model hybrid which requires the "noise maker" to help blind pedestrians to recognize the vehicle, plus it is a "base + premium" model. Is it possible due to manufacturing standardization practices that they just included the jack for the noise maker on all vehicles in this generation and then only plugged it in to hybrids, once the regulation went into effect? Is that device even a requirement in any countries outside of the US?
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Old Jul 30, 2021 | 09:11 AM
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Yep, one of my grad school classes went into some of the practices that made Japanese car manufacturers “leaner” and more profitable than traditional American car manufacturing techniques. American car makers historically might have had a dozen or so different wiring harnesses in this instance: one for cars with cold weather package, one for cars with fog lights, etc, under the fundamental premise that they were saving a nickel here and a dime there by not having unnecessary connectors or wires, they were matching each harness to the exact options required. Whereas the Japanese figured out that it was cheaper in the long run to just use one “universal” harness. So what if it had a few extra connectors? They would be stocking just one harness, and on the factory floor it was far more practical to use one harness for all cars than to have to manage multiple parts and ensure the proper part went into the proper car.
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Old Jul 30, 2021 | 09:18 AM
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Agree with PhxBill.
He nailed it! It's called lean manufacturing and reduced inventory and it's the smart way to build cars. It also allows features to be added after the fact.
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Old Jul 30, 2021 | 10:09 AM
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Before coming to Lexus from the Dark Side I sold Chevrolets.
The Cavalier had a loss leader trim level called "VL" for Value.
It had the footwell Courtesy Lights sockets installed and wired
but the bulbs were deleted! Had a box of the bulbs in my desk
to twist in when ever I sold one...
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Old Jul 30, 2021 | 11:12 AM
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that harness goes to this device: "speaker assembly, vehicle approaching"
wonder what that is.

https://parts.lexus.com/p/Lexus_2016...657048050.html
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Old Jul 30, 2021 | 11:21 AM
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It’s so blind folks at crosswalks can hear something when an otherwise silent electric vehicle is approaching.
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