On a 2004 Infiniti G35 sedan, if the power on the passenger side seat is totally shot, around how much would that cost to repair?

$300

Good question, because l just bought a 2003 G35 sedan, and it has the ''memory seat'' on the drivers side. It automatically slides back when l take the key out. l have been wondering if the power seat moves each time l put the key in/out, how soon before the motor wears out?

2004 Infinitis have a longer warranty than other years. Take the car to the dealer and find out if you're still covered. In any event, you need a passenger seat switch which controls the forward and back motion as well as the seat back angle. If either motion of the seat works you may have a bad seat motor. If both switches are inoperative go for the switch assy.