Looks like someone rigged up an aux cord with power for an MP3 player, GPS, or even a radar detector. Plug a source into the aux input and switch your radio to "aux", it should play over your sound system.

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2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD---
1993 318i - Brilliantrot / Tan - bone stock daily driver