Today, I installed my 2008 ML navigation stereo. I had the digitizer replaced and received the unit back after three weeks. After connecting all the connections on the back of the unit and the vents, I noticed two unused connectors. I can’t recall if these connectors were unused when I removed the unit. Despite this, all connections were made, and the unit operates flawlessly. Could I be missing something? Are these connectors used on other stereos?

 

Should have taken pictures before disconnecting. I've learned that the hard way.

 

I'm not 100% sure but I think they are all populated. There is one thing that always gets me because its not part of the body harness, there is a small sub harness that connects two parts of the unit. pics below.

 

Could they go to something else? Like a hazard switch or something?

 

I removed the unit today and, after further inspection, determined it was a non-functional “dummy plug.” I reconnected the unit, and all systems are operating as designed.

 

Using the pictures in post # 3 as a reference, the dark blue socket is unused. The gray socket is for the GPS antenna. The GPS antenna cable is not taped to the dash harness and may drop out of view while installing the unit.