Is it a 209.3 or a 209.4? GPS antenna at the trunk lid on a a cabriolet, at the top of the rear window on a coupe (not necessarily the visible shark fin as usual, this one may be only for CTEL and SDAR).
There is the same looking thing at the base of the windscreen too, this also lights up with red leds on startup. So the antenna is the sharks fin then ?
Does this allow the radio and satnav to work?