Bavsound BMW E90, Руководство по установке

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Audio Input Connections (Made at factory amplifier)
1.
Note the rectangular black box that was included in your amplifier wiring kit. It
has 7 total wires coming off it, and for this section, we’ll be using the White,
White/Black and Grey, Grey/Black wires. The red, blue, and black wire
connections will be covered in the Remote Turn On section.
2.
Now, we need to isolate the 4 wires on the BMW wiring harness that we’re
going to be working with. They are twisted together in pairs, and are found in
the main wiring harness that plugs directly into the factory amplifier which we’ll
unplug.