Posting heated seat question again over here

I recall reading some posts on the same issue. First, it should be noted that the cycle on and off feature of the heated seats is a necessary safety feature. That being said I remember one post saying that his Toyota dealership removed the leather covering and discovered that the heating wires were not properly spaced. Once they were arranged as they should have been the problem was resolved. Hope that helps.

Posted via the PriusChat mobile app.

 

Mine work just fine. Sorry yours don't.

 

The behavior of the heated seats Toyota's lawyers probably insisted on to avoid lawsuits is obviously different from what you consider optimal comfort.

Based on Toyota's warning about blankets potentially causing overheating, I think that there is not any temperature measurement going on at all. Instead, I think that it's much more likely that there's a simple timer built into the circuit that powers the heaters. I doubt that the on/off regulatory timer is built into the seat, also. It seems more likely that the circuit is in/near the heated seat power switch. If that's true, then there's a relatively simple test and fix for your problem - power the heated seats with an always-on (in ready state) power circuit. Turning the seats off when they get too hot would then be up to you.

You'd have to splice the seat heaters power leads somewhere, but maybe someone here has some insight as to where that should be for maximum convenience.

 

Also, the heated seats I have sometimes get too hot for comfort, rather than never getting warm enough, like yours seem to do. It might be a good idea to make sure they're working properly before you start changing around the wiring.