2003 Infiniti G35 climate controls radio do not work

Electrical problem
2003 Infiniti G35 6 cyl Two Wheel Drive Automatic

I have a 2003 infiniti g35 sedan that has had a problem for several months and has gotten much worse. It began with draining the battery overnight, which I replaced, but it continued to drain it. Next, the climate controls and radio would become "stuck" on a certain setting intermittently. Now, the radio / cd player does not work at all and the climate controls cannot be changed. I understand there was a voluntary service bulletin for certain VIN#s and mine does not fall within that list. However, I have learned this problem affects 2004 and 2005 infinitis without regard to model. The car has a nav system, but it works fine and is not part of the problem, which occurs regardless as to whether the car has a nav system. Are you aware of this problem and can I fix it myself? Are their any manuals that would show me how to take the console apart to fix it.