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I have a 2007 328xi with idrive and voice command. The car is wired for bluetooth but it wasn't installed. I picked up a TCU off Ebay and when I plugged it in I realized that the harness only has 3 connectors that plug into the TCU, but the TCU has 4 slots on the one side like the picture further up on this page (I'm missing blue?)
Does anyone know what each of those wires going into the TCU is related to?
In any event the car doesn't recognize TCU so it probably needs to be coded.
I am waiting for the bracket to arrive to properly mount the TCU, so it is currently wrapped up in a towel to keep it safe back there. Does it need to be bolted in to be properly grounded?
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