I have a Passat B5.5 2005 year with Harman Becker DSP sound system installed on it.
I want to install an aftermarket radio, but there's no speakers wiring next to the head unit. I've bought this wiring harness from ebay https://www.ebay.de/itm/Auto-Radio-AKTI ... 2749.l2649 but it doesn't work.
Maybe you guys know, which wiring harness I should buy in order to connect an aftermarket radio?
Here's some photos of my current setup:
