My radio is not turning on at all unless i disconnect my battery for 30 minutes at least then it will shut off after 15 minutes and my A/C buttons aren’t working either of course unless i disconnect the battery
First of all make sure you are testing with a new and or fully charged good battery. A weak battery will do some strange things.
Found a little bit of information on this. There seems to be quite a few G35s with the same problem. Some have claimed replacing a micro card as it was not able to read it. Others claimed they took the radio apart and found resistors had come loose and needed to be soldered back into place. One stated that ejecting the CD from the forward player reset the radio itself. And most claimed simply replacing the radio did the trick. 2007 – 2009 models should be the same. Radio part number jk61c or jk63c should work.
No radio or A/C Controls
Source: https://g35driver.com/forums/g35-sedan-v36-2007-08/454220-2007-g35-sedan-no-radio-c-controls-don-t-work-navigation-don-t-work.html