Greetings all, just joined after acquiring a cherry 2009 Z4 (3.0 Sport edition, black 6-speed hard top convertible with red leather interior and only 44k miles on her). My issue is extremely annoying and I've already done extensive research. Regardless of if I'm sitting at a light, accelerating, decelerating, or maintaining speed (be it 30mph, 40mph, 60mph, or 75mph) the stereo volume noticeably goes up and down on its own. It is especially bad with the top down at speed since it knocks about 20% of the volume off whenever it feels like it (down, back up to where I have it set, back down, with no rhyme or reason, no cadence, completely unpredictable). It happens all the time, be it radio or auxiliary input from my phone on Pandora.
I already found the hidden menu and tried a sensitivity setting of 1, 2, 3, 4, 5 and 6 (the only six settings/options). It acts the exact same way. I'm guessing the software is bugged and essentially broken from an electronics standpoint, thoughts?
I hope I'm wrong and someone can help me shut the faulty speed sensitivity completely off so that my volume settings are absolute law at all times, otherwise I sense a costly repair. I'm already planning on replacing the 6 inferior factory speakers and adding an amplifier to the BMW Professional head unit. Note that this car does not have navigation or satellite radio options. Ideally I'd like to keep the BMW Professional head unit and simply buff up the speakers and amplification to preserve the look and feel of the vehicle, so a solution/fix/repair is my goal here.
PS. This is my first BMW car after a lifelong love affair and patient pursuit (I'm 41yo and planning to relocate to San Diego next month for a job after 19-years here in Raleigh, NC and the first 19.5 years of my life spent growing up in Syracuse, NY with some time in the US Navy between the two). For the record I also picked up a sweet 1993 K-75 motorcycle a few weeks ago and she is a gem, including two days of putting her through her paces in the twisties of Western NC! Thanks for having me.
I already found the hidden menu and tried a sensitivity setting of 1, 2, 3, 4, 5 and 6 (the only six settings/options). It acts the exact same way. I'm guessing the software is bugged and essentially broken from an electronics standpoint, thoughts?
I hope I'm wrong and someone can help me shut the faulty speed sensitivity completely off so that my volume settings are absolute law at all times, otherwise I sense a costly repair. I'm already planning on replacing the 6 inferior factory speakers and adding an amplifier to the BMW Professional head unit. Note that this car does not have navigation or satellite radio options. Ideally I'd like to keep the BMW Professional head unit and simply buff up the speakers and amplification to preserve the look and feel of the vehicle, so a solution/fix/repair is my goal here.
PS. This is my first BMW car after a lifelong love affair and patient pursuit (I'm 41yo and planning to relocate to San Diego next month for a job after 19-years here in Raleigh, NC and the first 19.5 years of my life spent growing up in Syracuse, NY with some time in the US Navy between the two). For the record I also picked up a sweet 1993 K-75 motorcycle a few weeks ago and she is a gem, including two days of putting her through her paces in the twisties of Western NC! Thanks for having me.
