BMW Repair Questions? Ask a Mechanic for Answers ASAP
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I would suggest checking your fuses if you have not but this points to a failed amplifier which would require its replacement. If no amplifier is fitted (ie you have the base stereo) then this would be a failure of the main radio head unit. This is a common issue.
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I am sorry I didn't realize you had checked fuses as I had no way to know this. The reason this affects your sensors and alarm is because the audio for those sounds is run through the main stereo system along with radio/cd/etc. So, these sounds also stopping is consistent with an amp or head unit failure as these are what generates audio output depending on vehicle options. Please do not forget to CLICK ON a positive rating