Passenger side seat heater won't turn off

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01-06-19, 10:57 AM

Gottspd

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Passenger side seat heater won't turn off

Hi all. I just picked up a 2012 RX450H FWD and the passenger side seat heater heats the seat even when the switch is set to off (the heater does turn off when the car is off). I replaced the switch and it still happens. I'm thinking it may be a relay that's gone bad, but I don't know where any of the seat heater relays are. Any thoughts/suggestions?

Last edited by Gottspd; 01-06-19 at 11:00 AM.

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01-07-19, 05:47 AM

Clutchless

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If you bought it from a dealer I would take it back. Otherwise you could pull the wires from under the seat as a temp fix. Check the owner's manual and the under hood relay box as it has a map under the cover and maybe it will help identify the relay you seek.

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01-08-19, 10:56 AM

Audiqv8

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Quote:

Originally Posted by Gottspd

Like all modern cars, the seats use a 'Seat Heater ECU' rather a relay to determine if the heating element is on or off. Instead, it determines how much current (amps) will be sent to the heating element. The on/off switch that you replaced turn on the 'Seat heater ECU'. The 'Seat Heater ECU' is just a very expensive name for a control circuit board.