iDatalink's HRN-RR-VW1 interface harness allows you to connect a new car stereo in select 2002-16 Volkswagen vehicles, working in conjunction with iDatalink's Maestro ADS-MRR or ADS-MRR2 module. Once connected, you'll retain the use of your steering wheel audio controls, navigation outputs, and amplifier turn-on in these vehicles. You'll also gain the ability to assign secondary functions to your steering wheel audio controls.
The package includes connectors that plug in between the Maestro module, your Volkswagen's radio's wiring plugs, and your new car stereo. You'll have to solder or splice together this harness's power/ground, illumination, speaker, and navigation output wires to the corresponding wires on your aftermarket receiver's wiring harness.