Heres a little DIY and guide on the secret menu, from the beginning through all the functions... I am sure most of you know this but for anyone who doesn't here is a little walkthrough. Do this at your own risk. I don't mess with settings before knowing what they are beforehand and recommend you refrain in the same manner.
From the start, go to Settings
Once you are in Settings, hold down Menu for about 10 seconds
It will take you to this menu
First section is "On Board Computer"
I really don't know what any of that means, but if you press Functions...
You get 3 options - Version, Key Settings, and Contrast. Contrast is pretty straightforward
I usually turn off my monitor when driving because its so bright and distracting, but this gives me a nice option to turn it down. I have it at -4. Next is Key Settings
I dont know what Key means, but that is where it was by default. I am also not sure what OBM increment sensor means. I assume Radio increment sensor has to do with the speed-volume increase level, which is something I will investigate later. It was strange that the next option over was FF instead of perhaps, 01, 02, etc... so I left it alone for now. Leave it alone for a second or two and the Function button will come back
This is computer version, probably not of use to any of us. Next (back from the Secret menu base menu) is Navi/Graphic Functions
Again probably not useful to any of us. Next on the secret menu is Video, which I can not access. After that...
GPS version. Then we have GPS Status, tells you the Latitude/Longitude and I even believe the current speed you are heading. Of course this was in my garage so I am at 0m/s
It bothers me that this menu knows the correct time but note on the bottom right that it does not know the date
if someone can help me with that, I would appreciate it
The last function under GPS is more boring numbers
Probably one of the coolest things we have is Sensor Check, including a real-time Gyro, telling you which direcetion you are headed, as well as the G-forces to go along with it. Sometimes it is fun to drive around with it on and it can tell you where you are going. Not sure why my Wheel Sensor is at 0 though but it may have to do with the fact that the car is not on
Lastly is telematic settings...
Pretty cool to be able to input your number and license plate in there. However I could not adjust the VIN, and it makes me wonder if my car got a radio from a 7 series - thus the "7er" designation. You can also input your car's color - useless but kinda cool
If anyone knows what the "Radio increment sensor" or "OBC increment sensor" does that would be cool. I get the feeling they both have to do with getting louder as speed increases, but how to set them I am not sure.
Enjoy the secret menu if you did not know how to access it before! I can now enjoy my navigation system being on without blinding me thanks to the contrast!!! Happy motoring everyone!