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Heated seats trouble shooting please


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Dahj
Novice

Jan 16, 2022, 5:38 PM

Post #1 of 11 (270 views)
  post locked   Heated seats trouble shooting please  

My heated seats aren’t working on a Lexus rx350 2010. Obviously it could be a lot of things, but, wondering just as much as to what it most likely isn’t, considering that…
- the indicator lights aren’t lighting up? -The fuses are good.
The dream would be if it’s most likely the switch (that has had plenty of spills seep into it), and I could replace that, and hope that that’ll do it?!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 16, 2022, 5:50 PM

Post #2 of 11 (268 views)
  post locked   Re: Heated seats trouble shooting please  

If the light isn't lighting up it's most likely the fuse but all you have to do is test for power on the violet wire with the key on.

It is powered by fuse ECU-IG1 3 10A



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Dahj
Novice

Jan 16, 2022, 8:31 PM

Post #3 of 11 (252 views)
  post locked   Re: Heated seats trouble shooting please  

Thanks Hammertime, is this violet wire at the switch?
Both left and right fuses look flawless. Is there still a chance they are no good? Would the indicator lights be separate (left/right) in relation to the fuses being blown?
What would be the next assumption if the issue isn’t at the fuses box?

In Reply To
If the light isn't lighting up it's most likely the fuse but all you have to do is test for power on the violet wire with the key on.

It is powered by fuse ECU-IG1 3 10A


In Reply To


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 16, 2022, 8:35 PM

Post #4 of 11 (248 views)
  post locked   Re: Heated seats trouble shooting please  

There are 3 fuses for the system. The left and right are after the switch. The one I gave you powers the switch.

You can't just look at a fuse. You have to use a test light and test for power at both ends of the fuse.

Yes, the violet wire at the switch. I'm betting the fuse is blown.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Dahj
Novice

Jan 16, 2022, 8:42 PM

Post #5 of 11 (244 views)
  post locked   Re: Heated seats trouble shooting please  

Ok thanks. Where is the 3rd fuse located?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 16, 2022, 8:44 PM

Post #6 of 11 (240 views)
  post locked   Re: Heated seats trouble shooting please  

The same box the other 2 were.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Dahj
Novice

Jan 16, 2022, 9:18 PM

Post #7 of 11 (233 views)
  post locked   Re: Heated seats trouble shooting please  

This is the fuse diagram
Everything else seems to have a lot of other things attached. Seat heater is mentioned a couple of times, in 6 and 21. But there’s aren’t any issues with anything else on those fuses. Still worth checking out those fuses? Or am I missing something?
https://fusecheck.com/lexus/lexus-rx-350-al10-2010-2015-fuse-diagram


Tom Greenleaf
Ultimate Carjunky / Moderator
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Jan 17, 2022, 2:10 AM

Post #8 of 11 (217 views)
  post locked   Re: Heated seats trouble shooting please  

By that diagram I'M NOT SUSCRIBING TO showed position 36 and 37 for right and left. Both out back to first one.
Check power already said with a test light without even removing fuses WHEN you enable the items. If you don't know how I'll explain,
Tom



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 17, 2022, 5:40 AM

Post #9 of 11 (213 views)
  post locked   Re: Heated seats trouble shooting please  

OK, you're making this harder than it needs to be. I gave you the correct fuse in the first post which is #6 in that diagram.
That is the only fuse you need to be concerned with right now.

If that fuse is good, then you are back to testing power into the switch as I also suggested in the first post.

You need a test light for any of this and if you don't have one, we are all wasting our time here.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Jan 17, 2022, 5:42 AM)


Dahj
Novice

Jan 17, 2022, 11:48 AM

Post #10 of 11 (185 views)
  post locked   Re: Heated seats trouble shooting please  

Sorry I didn’t mean to be difficult, while waiting to pick up a test light I was just curious as to how anything else on that fuse could be working (mirrors/moonroof/wipers/washer) with a busted fuse.
Anyhow, after testing the fuses I went to find and test the violet wire and found the switch diconnected! 🤦‍♂️
Whether it fell out or the original owner didn’t like an accidentally hot tush I’ll never know. But my bum is happy, thanks for you detailed and expert advice.
Cheers


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 17, 2022, 11:54 AM

Post #11 of 11 (183 views)
  post locked   Re: Heated seats trouble shooting please  

I've owned 6 RX's and that exact same thing happened to the one I'm driving now. That's why that was my starting point.

Glad you got it fixed. Closing this question now.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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