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Under the rear seat cushion on the drivers side is a control module/ relay box that operates all the windows and the sunroof for the car. To lift up the rear seat cushion there is a tab on both sides of the rear seat that you push on while lifting the seat up. Once the seat cushion is out you can find the relay housing on the driver side right near the bend. Start there since everything went out all at once. Wrecking yard is the best place to pick up another one.
Start pulling fuses,one at a time,with an AMP meter in series with a battery cable. When you find anything over a few Mili Amps still on,you found the item,assuming every system has timed out. Some may take 15 min to do so. 40 Mili Amp will always be there, to power memory,clock,etc.
The heating element in the seat may be failing, even thogh it heats the seat, the element could be causing the circut to spike upon power shut down. Relay takes mili-second to shut down after ignition kill and power feed comes direct from battery. Check amp. draw at switch of bad seat and good seat upon shut down. If bad seat higher that 5 amp difference element n/g. Also check for bad relay as they can short internal and cause problems if primary power cut before switch shut down.
You may want to check with factory recalls. There was a letter sent to 2007 owners about a computer upgrade to solve loss of sudden power along with some ABS issues.
I'd definitely check the fuel pump, had a similiar fault with mine, all seemed ok until upon closer inspection there was a hairline facture around the inlet pipe on the pump which was drawing in air and losing the pressure in the fuel system
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