I want to add and integrate cell phone/bluetooth capability to my 2004 ML350OEM audio/nav system. How do I do it? I've read the threads on adding adapters, cradles, version coding, etc., but I'm just trying to find out if/where my cell phone wiring harness interface is actually located first to determine what equipment I need.

Can someone please provide me step/step for my specific model/year?

Thanks,
rg