Behind the head unit is a wire separate from the primary bundle that has a label on it indicating "antenna" or something like it. When I replaced my head unit with an aftermarket one, I simply connected that head unit's "antenna" lead to the one in the car-works like a charm.

That said, I really can't imagine how this functionality could've changed...unless somehow the leads to the radio have received some sort of altered power configuration.

A few questions - If you have your radio on and shut the car off, does the radio stay on but the antenna retracts? What about if you have the car & radio on, then shut off just the radio, does the antenna retract?

This one's tricky - hope we can help you figure it out

__________________
"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo