You need something connected to the analog outputs of the deck - the analog pins that would normally feed the HiFi amp. When we did this in a Stereo car, we used the 9V outputs that drive speakers and connected them to a set of OEM tweeters we installed under the grilles in the rear deck. You probably need a set of tweeters there, AND small amp like an Alpine PowerPack on the outputs of the BMW deck driving the tweeters, to make the PDC sounds.
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