When purchasing the Bavarian Carplay Retrofit Kit, you may need an AMI to Aux adapter in order for the aux function to activate.
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Simply plug it into the AMI port. The Aux end can be left hanging
This cable transmits audio signals only, no content is displayed on the Multi-Media Interface (MMI) screen.
Before purchase please ensure that the original AMI/MDI box and the original audio host (usually installed in the co-pilot's glove box or center armrest box) is pre-installed or installed in your vehicle.