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Originally Posted by RichardP1
The white wire on pin 13 is the remote antenna switch, it's ideal for an Amp as it goes on and off with the radio regardless of the ignition state.
US X5's all have amps, the European spec X5's don't have amps unless you have one of the audio upgrades like DSP.
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But wouldn't that serve no purpose if you switched over to the CD Player or AUX signal? When you switch from radio to CD, the antenna receives no power since its not being used or required. SO his amp will turn off as soon as he switches to anything other than the radio/tuner, resulting in no sound out of his speakers.