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First of all Dension tell you to power the Gateway 500 with an unswitched power supply and not from the CD Changer. However in our cars you can power it from the CD Changer because the CD Changer is on as long as the car is on and then goes to sleep with everything else. Powering this directly from the battery is not required and not recommended too else you may drain the battery.
Next to make this install a full plug and play solution you need the following BMW OEM parts
1 x UNIVERSAL SOCKET HOUSING UNCODED 3 POL. 61138377072
1 x UNIVERSAL PIN TERMINAL UNCODED 3 POL. 61136931929
2 x PIN-CONTACT 0,75MM 61130006664
2 x BUSHING CONTACT 0.75MM 61130006663
So what you do is disconnect the plug X18180 from the back of the CD Changer, that will have two power lines and the 2 optical cables.
Remove the RT/VI wire from the position 1 and put a 61130006663 in its place, this will become your +12V.
Then remove the BR wire from the position 2 and put another 61130006663 in its place, this will become you -ve.
Put the RT/VI and the BR wires of the CD Changer that you just removed into 61138377072 in position 1 and 2 respectively. Its always a good pratice to maintain the numbering between plugs, that way you can put things back together later.
Now put two 61130006664 into 61136931929 at positions 1 and 2.
Next join up the wires between Dension Red power line and the wire coming out of the CD changer position 1 and the wire coming out of 61136931929 position 1.
Tape or solder the joint well and then insulate this.
Do a similar thing with the Dension Black power line and the wires coming out of the CD changer position 2 and the wire coming out of the 61136931929 position 2.
If done correctly you should be left with the car's original wires RT/VI and BR going into your new socket 61138377072 and when that mates with your plug 61136931929 that will distribute power to both the CD Changer and the Dension Gateway.
When you was to reverse this all you need to do is put the CD Changer contacts back into the original socket.
In terms of the placement of the Dension Gateway unit what I did was attached two sided Vecro (hooks) tape to the back of the unit and position the unit high in the passenger's footwell to the Left. This position is good because it allows the various plugs to be put into the unit from the bottom and the main power and optic cables come into it from the front. In the image the Dension unit is where the bright Orange optic fibers are connected to.
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Then ran the cables all the way to the center console. Dension sell an extension kit for their accessories but I didn't bother with that because its a standard USB cable and I just used one that I had got with a USB stick. The iPOD one is more tricky and it actually uses a 9 pin mini DIN which is hard to find. To extend this cable you need 1 each of items MD-9P and MD-9S from this site http://www.action-el...s.com/ppdin.htm or pick up R58190B-08 from http://www.stockcabl...m/minidin.shtml which is a Male-Female extension which jcool10181 picked up for me (thanks again).
In terms of the Dension Aux box which has the switch for the CD Changer or Dension, the default is the Dension. So if you never intend to use your CD Changer again and your not going to use the Dension provided AUX IN then you need not connect the AUX box.
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Thats it. And finally remember that the instructions that are included with your unit may not be the same as the ones you download. Where Dension may brilliant products their documentation department is rubbish.
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