Aftermarket radio installation
im new here. I have a 2007 ML63 AMG W164. I recently bought a Pioneer Nex with a scosche LPMZ25 adapter for steering controls etc. it’s basically plug and play and the radio turns on fine. The issue I have is there is no sound. The LPMZ25 comes with an adapter to plug the fiber optic cables in and then to the RC jacks in the back of the radio.
if I plug the original radio back in then all works well and sound is there. Can’t seem to figure out what the problem is. Any help will be greatly appreciated.






