No the cruise control works just fine, when you install an aftermarket head unit you use the volume and song selection button function.

So I installed it, the wire was "white with a grey stripe" not anything like what PAC described. Additionally, the white wire was very yellowed so I honestly thought that it was yellow and not white when I first saw it. I followed it out of the clockspring and tested it before running anything to it. It is roughly 11.6v when the ignition is one and whenever a button is pressed the voltage will drop by roughly 0.5v. Everything works as it should now minus the mute or phone buttons which I never use anyway.

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Current stable: 2005 LMB X5 4.8is, 2000 LMB M5, 2004 JB M3 6spd coupe