Good day good Sirs & Ma'ams.

I am new in this forum and just purchased a second hand 2012 G37x coupe for cheap, engine is running smooth with no error codes, suspension is fine & is really fun to drive but just some minor issues. Memory seats do not work, power side mirrors do not work and back up camera do not work either, camera doesn't even have any settings in the service menu. All fuses are intact. I even asked the previous owner but just says that its his sister's car and they do nit know much about those issues. Can anyone shed some light on where I would start diagnosing those problems? Thank you very much.

 

What does that mean?
Did you test them?
Do you own a multimeter to chect for 12v power?
Follow the troubleshooting in the FSM

 

I agree with Telcoman, how are your electrical diagnosis skills? Outside of checking all fuses there's really not much you'll be able to do without the proper tools or proper understanding of the wiring diagrams.
I would suggest you study the FSM to determine if the seats and mirrors share wires.

 

I believe there is a fuse that controls that. Unhook the battery and pull every fuse one at a time to check them