Help My 06 400H Heated Seat Switch Not Working

[phillip06RX400h]

I am looking for electrical circuit diagram for the heated seats system to troubleshoot this problem:

my driver switch for the heated seat kept ON to the max without turning on or off. My seat is burning hot.

I removed the connector out the switch... the seat still hot.

The only way to defeat the heated seat is to remove the fuse which I did.

Any ideas if the switch or the relay is bad!!!

Thanks in advanced.

[lenore]

I would suspect if the switch is disconnected and seat is still hot, then the relay is bad....However there is a thermostat on the seat heater.....

[phillip06RX400h]

Thanks lemon.

There are 2 relays next to the fuse #43. Do you know if they're heated seats relays? If yes they are, which is for driver seat?

I will put the fuse #43 back and remove the relay one at a time. Is it OK to do??? Any safety concerned??

Thanks in advance

[phillip06RX400h]

Oops,

I am sorry Lenore..... Didn't mean to call you lemon....

[flash14]

This is from the 2008...

I am looking for electrical circuit diagram for the heated seats system to troubleshoot this problem:

my driver switch for the heated seat kept ON to the max without turning on or off. My seat is burning hot.

I removed the connector out the switch... the seat still hot.

The only way to defeat the heated seat is to remove the fuse which I did.

Any ideas if the switch or the relay is bad!!!

Thanks in advanced.

[lenore]

If there are two relays, one for each seat a quick troubleshoot would be to swap and see if the problem goes away....Same for the switches....

[phillip06RX400h]

Flash14: Thanks so much for the diagrams. This is exactly what I've been looking for. I will post the post all troubleshooting steps later if this gets fixed.

Lenore: Thanks, I will swap the relays first. I will follow up later.

[Bluebullet]

Had the same problrm, there is a small connector on the bottom of the seat with a green and grey plug in it. The black part that the plugs plugged into was melted, I replaced the black part for 158.98 and now it works normal again,

[JaySudkamp]

Philip, I am having the same problem with Lexus 400H. Driver seat just gets hotter and hotter. What did you ultimately do to fix your problem.

[maseace]

Philip, I am having the same problem with Lexus 400H. Driver seat just gets hotter and hotter. What did you ultimately do to fix your problem.

Attached is info from the RX400h repair manual. Start with the switch.

SeatHeaterSwitch.pdf

SeatHeaterParts.pdf

SeatHeaterDiagram.pdf

SeatHeaterControlLH.pdf

[dedominguez]

On 10/30/2013 at 1:36 PM, maseace said:

Attached is info from the RX400h repair manual. Start with the switch.

SeatHeaterSwitch.pdf

SeatHeaterParts.pdf

SeatHeaterDiagram.pdf

SeatHeaterControlLH.pdf

Hi there,

My RX330 driver's side seat is definitely getting hotter and hotter on the left side of the seat pan - tho I can dial it down to a bearable temp but the rest of the seat pan/back are not very warm.

Can you please repost the RX400H repair manual PDFs? They don't seem to be available anymore and realizing original posts were 9 yrs ago, this is a longshot ask.  

Thanks in advance.

Daniel