1. Yes the Navigation works
2. the car came foctory with the navigation in it. The radio was to the best of my knowledge the factory OEM radio that came in a 2001 M5. it had sound and controll when i originaly got the car. And it did appear n the Nav screen, The car had the wrong steering wheel in it(x5 and beat up). The air bag was blown also. I changed the steering wheel with the airbag and radio control module that is mounted in steering wheel to the one from the M3 i bought to replace the airbag. some where i lost radio. I then changed it back to the one(radio steering wheel module ) that came in the car when the radio worked. Now it still does not work. No sound or no radio functions on Nav screen. At one point i did check the volume up, DN, & seek functions in the wheel controls when the power light would not come on the radio. I checked this with a luanch x431 tool. they worked but still no power light on Nav surround, no radio functions on Nav screen, No sound.

Much appreciated help and thanx again even if we dont solve this problem.

I also have a 2001 540 6 speed sitting right next to it. I am familar with these cars.