M45 Noise Cancellation

[Diganutz]

Guys,

This morning on the way to work, I started to here a lot of road noise. Checked all windows and doors, which were fine. Then I noticed the sound was coming from the 4 speakers on the top of my seats. So I'm now thinking something went haywire with the noise cancellation. I Stop the car, turned off and restarted, but it was still there. Called the dealer, they haven't seen the fault before, but will fix it if I take it in. Only problem is I live about 3 hours from them and I'd like to just try and reset the system if possible. Anyone have this problem or know how to fix it. I only turned the car off for about 10 seconds or so, if that little time to the computers reset?

I'd be grateful for any help.

Thanks.

Colin.

[szh]

This morning on the way to work, I started to here a lot of road noise. Checked all windows and doors, which were fine. Then I noticed the sound was coming from the 4 speakers on the top of my seats. So I'm now thinking something went haywire with the noise cancellation. I Stop the car, turned off and restarted, but it was still there. Called the dealer, they haven't seen the fault before, but will fix it if I take it in. Only problem is I live about 3 hours from them and I'd like to just try and reset the system if possible. Anyone have this problem or know how to fix it. I only turned the car off for about 10 seconds or so, if that little time to the computers reset?

That is indeed very unusual!

You can try a battery disconnect (for about 15 minutes) and see if it will help. Remember to jot down all your radio settings before you do this. I will be surprised if this works though!

I tend to think that this may indeed be an electronic component failure. This is a SWAG, but I think the microphone that is used to measure the ambient noise is busted (could it be covered up perhaps?). I forget where the microphone is

This will lead to erroneous signals being fed to the noise cancellation system. A second possibility is that the noise-cancelling electronics (perhaps the microphone amplifier or the cancellation circuits) are broken.

I suspect you will need to take it into the dealer. Problem is that he may not order the part "on spec" till he checks the car out. May mean two trips as a result.

Z

[Diganutz]

The constant noise was gone on the way home. Just loud static when I hit a bump or drove over gravel. I'm about 99% sure the mic is toast. Anyone know where the mic is located? I checked the mic for the Phone and it's fine, so I assume it's a different one.

So for now I just turned off the bose autopilot, which according to the manual turns off the noise cancellation. I didn't get any noise after I turned it off.

Thanks.

C