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temecula,
Welcome to the board...
The CD changer that you are talking about is mounted in the left rear part of the car, in the cago area, right? In there, there should be 2 connectors, one is a 3-pin and the other one is a 6-pin. Are they present in your car? They should be there, if you car never had a CD-changer, they are probably furled away in the back and taped to other cables. Technically speaking, CD-changer in US spec BMWs is a plug-n-play installation, as long as you are using an OEM hardware.
The power to the changer comes from the pin 2 of the 3-pin connector, pin 1 is a ground and pin 3 is I-bus, the communication wire that tells the rest of the car that the changer is there.
You did not mention if you have DSP - in that case, you might have to use a coax cable instead of the 6-pin connector. There are couple of variations in the DSP set up, but let's take care of the changer first.
The changer fuse is in the right rear part of the cargo area, fuse # 72, it is a 30A fuse, the first one from the left in the row of the fuses.
For a simple changer installation you do not need an AUX cable - let's do one thing at a time, so not to get confused...
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