[ezs9]

there is constant high frequency buzzing noise from speakers, turn off the radio with engine off can hear the noise clearly as long as ignition on.
Is speaker broken? center dash radio unit broken? electic wire broken? thanks

[watchout-everyone]

This happened to me.

I followed this guide to take out the stereo and unplug + re-plug all the wire connectors you see.

No longer noise after that

[ctuna]

The stereo is never really off on these because it use's it for the car alarms.
Whenever you hear odd sounds in a BMW with and Amp first stop is to check the
amp area has not been flooded with water.
The re seat the connectors is worth a try if you don't find water on the amp.