Hello I just purchased a G35 coupe 6mt fully loaded. The previous owner stated the only thing wrong with the car is the GPS does not work. I purchased the car and have played with it sometimes (pushing the button so it comes up) and I have seen it work 2 times. Once it works it operates great, until the key is turned off, then it doesn't operate any more. I have tried a voodoo of pushing buttons wiggling the screen to try and find a sort. I am new to these cars but I am by no means new to wiring/mechanics. I am looking for something that locates the power box in this car for the GPS and a chart that shows what it should be doing (like to test it with a volt/ohms meter). It worked awesome (when it works) and I really want to get it to work. I have searched this forum and the g35 driver forum trying to find a tech guide or at least someone that has replaced the power box. I only found a few thread that were stating the GPS stopped working after replacing a battery. Thank you for your time in reading this and helping with this issue.