Windshield problems of the 2004 Infiniti G35

I have a 2004 Infiniti G35 sedan. My audio failed and a/c stuck . . . The same problem they voluntarily repaired in 2003. (service bulletin #03007a and NHTSA item #10001253) it is caused by a failure of the audio finisher circuit board. Because of this, I am unable to turn on the window defroster and have difficulty seeing through the windshield when there is condensation due to certain weather conditions. When I brought my car to the dealership in roseville where I bought it, they said they would check on it but knowing there was only 10 days until my extended warranty was up, they never followed up. I have seen many 2004 owners on line with the same problem but Nissan/Infiniti don't seem to care. This is definitely a safety issue as my windshield fogs up when I drive to work, which is always early since I am a nurse and af reservist.