Heated Seats, Yukon Denali

this is a copy of your owners manual fuses start on page 565
The instrument panel fuse block access door is
located on the driver's side edge of the instrument
panel. https://www.manualslib.com/manual/1029265/Gmc-Yukon-2007.html?page=1#manual

https://www.autozone.com/repairguides/Escalade-Suburban-Tahoe-Yukon-Denali-DenaliXL-YukonXL-1999-2005/Seats-2004/Driver-Seat-Schematics/_/P-0996b43f80370a19 https://www.autozone.com/repairguides/Escalade-Suburban-1500-2500-Tahoe-Yukon-Yukon-XL-1500-2500-2006-2007-Yukon-Denali-and-Yukon-Denali-XL-2005-2006/Power-Seats-2007/Driver-Seat-Schematics/_/P-0996b43f80cb1bbc https://www.tahoeyukonforum.com/threads/power-seat-wiring-help.63730

I would check the wire harness under the seat and make sure they are clear of the seat tracks. Next make sure the plug ins under the seat are tight. If only the driver seat is shutting off may be heat element has gone bad.If both are doing it(passenger and driver) there is probably a module that controls them and that has gone bad.

the heat element in the seat might be worn out

i have same issue here 2003 yukon

checkl fusers and cables to that
the problem is 100% with power

hello, have someone check all fuses-and plugs for the power seat, they may be a relay for this problem, can call autoparts store and ask about any relays for the heated seats and the power seat, if thats not it you may have to replace, electric motor for seat, sounds like a fuse, the way it all quit working..

The controller could be bad but I would probe the related wiring first. From your symptoms it sounds like something can not handle the electrical load. You turn the F/R seat heater on but then you turn on the F/L and the whole system fails. It does sound like the source of the problem will be under the drivers seat. Testing needs to be performed to confirm and identify the source. Both seats share the same fuse and ground. This circuit may have a damaged wire or connector somewhere. Inspect and test as much as you can. Also look underneath the seats for anything. Customers are not aware that personal belongings and trash get pushed underneath the seats and will damage wiring. Also excessively moving the seat forward and back will weaken the harness over time. Please write back and let me know what you need. If it is more diagnostic information or suggestions just let me know. Good Luck

test to see if you have any power going through all the connectors for the seat heater, there may be a spot where there is a connector that has gone bad, or potentially it could be the whole element that is bad

See GM TSB 05-08-143-001, If you have Adjustable pedals, especially if they don't work with the memeory buttons, but function with thier own buttons. Its the Brake Pedal Position Sensor is shorted and mesing up the seat module which controls the heaters too. My 05 Suburban had the same issue