Are you trying to bypass the antenna amplifier? Looks to me like X424 and the standard shielded antenna connection are what you connect to the head unit (Power on comes from the amp connector (which feeds from the head unit anyhow). Don't connect the remote on lead to matrix at all, it will blow the head unit as the remote on can only supply a small amount of current (for powering a relay switch armature in an amp and/or power antenna unit.)
If this is what you had and it was no good--- I don't think you should try bypassing the amp. The problem is simply the impedance that the radio section (RF front end in the radio) expects.
My solution (lucked out) was to use a JVC front end- the new ones with USB seem to manage pretty well. I had a great Blaupunkt before that, it was not so good with the (wonderful) window antenna setup- its nothing like a standard antenna and is typically 'BMW-ique'.
I can imagine many others being far worse than that though- even the 'good' units.
Cya,Nick
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