Your description sounds similar to what happened to my 99 540iT just before the amp went silent....forever.

I would hear 6 high-pitched "beep, beep, beep, beep, beep, beep"... just as you described. Next time you hear it, try to see if the sound is coming from behind the rear right cargo area (where your amp is located). If one day soon you lose all audio from your radio/cass/CD ... then you'll know that your amp went t!ts up.

BTW...the e38/e39/e53 uses the same amp except that it is coded to each model based on its interior's dynamic dimensions and how it's audio system is optioned. If you would happen to need a used one in the near future, you can "shop" for one from any of the aforementioned BMWs...but just know that the amp will need to be coded to your BMW to prevent it from having a muddled sound...unless you find one from an X5 that is optioned just like yours. And there are two types of amps...DSP & non DSP.

__________________
Become a BMW CCA member! Click HERE to join and feel free to use my BMW CCA member #191509 as a referral.

• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)