I may have good news!!
Went out for a drive and went into the system, Set-up; Vehicle setting; A/C (Climate Control) and there I found a -/+ for R & L seats temperature. Mine was set in the middle so I've raised to the Max and we'll see what happens.
There are so many settings to remember in these @#$% electronics that they make me long for the buttons!

 

that's the adjustment for the automatic seat temp setting.
we had this conversation about 6 posts up

 

Well I thought I could give good news on the heated seats, but not so!
The change I made in settings I hoped would have given me warmer seats, but instead that change gives you a longer time period on the 3rd (highest) setting before it goes down to 2, but better than it was.
So a slight improvement was obtained.

 

Cocal: The setting in Media screen allows for seat temperature adjustment, while in Auto. The issue mentioned here was that the seat gets too hot. You can reduce temperature by reducing the heat setting for driver or passenger seats to alleviate this issue.

My settings are always on Auto and by increasing it, it did in fact also make it warmer. These heaters are not as hot as in some other Toyota/Lexus vehicles, but increasing the setting made it slightly better. The Steering heater is even worse.

There is also a TSB to address the issue with insufficient heat. I am not sure how effective that is though. I had it done and did not notice that much difference.

 

My driver seat would get extremely hot regardless of the setting for the heat level. The passenger seat would get warm but not hot like the driver seat. The driver heated seat function was basically useless after a minute because it was too hot to be comfortable. I took the car to the dealer for repair and they told me it was a known issue and covered the replacement of both seat heaters under warranty. Since the replacement, both seat heaters work great, just like they did when the car was new.

 

Am I to infer that the heated seat worked OK in the beginning and then suddenly it was too hot and could not be adjusted?
Mine NEVER gets beyond warm!

 

That's great info, thank you!

Was your car still under warranty? Mine is just out of warranty, so not sure if they'll cover or charge me. Did your sheet have an estimated cost?

 

My driver's side seat warmer is usually hotter on auto than I would prefer on my 2020 RX450hL. I'll check out the settings mentioned to see if that helps.

However, I have noticed that the seat warmer temperature on auto seems to vary with the main AC/heat temperature that the driver or passenger selects. If I set it to 74F, it picks the 3 LED/high setting. If I set it to 72F, it picks the 2 LED/medium setting.

 

That's right they work together when in Auto.

 

Sherry314. Any chance you have a part number of the replacement? I have the same issue with my RX350. Heater worked great until about 6 months ago and now just gets extremely hot.

 

Hi teknoprep, I have the same year Lexus RX350 with the exact same seat heatting issue (it's either super hot, or off). Were you able to resolve your issue and how ?

 

Sherry314, I'm having the exact same issue on my Lexus RX350 2016. The seat heat is either too hot, or off. Did you get yours fixed?

 

Anyone have any information on which replacement part is needed or what this should cost to repair at the dealer? Anyone attempt to fix it themselves?

 

This is interesting. I have a ‘22 RX and I feel like the heated seats are sort of weak. I usually have it on the third setting (it’s pretty cold here right now) and it takes some time to get warm but never hot to the point of being uncomfortable. The third setting of heated seats on my Acura RDX would light my behind on fire.

 

There is a TSB on fixing the heated seat issue. It is a very lengthy process and can be costly though, if not under warranty.