I have a 03 G35 coupe I checked all the fuses in all 3 locations and checked bulbs and everything seems good but my taillight side marker lights don't work and also the map and dome lights don't turn on when I open my doors or unlock the car but when you press them to turn on they work does anyone know what it can be? I'm also have a problem where my heated seats don't work could someone please help me with this?!?

I'm not sure if I fully understand the scenarios in which your lights don't work, but maybe the switch that detects when the door is open is the issue? Although if it's not working with either of the doors, it would be unlikely both are broken.

With regards to the heated seats, do the indicators on the switch light up or are the indicators and the seats not working when you flip the switch?

Yup switches both light up and nope don't work when you unlock or open doors