The head unit is the centerpiece of the car sound system. Typically located in the center of the dashboard, modern head units are densely integrated electronic packages housed in detachable face plates. Head units give the user control over the vehicles entertainment media: AM/FM radio, satellite radio, CDs, cassette tapes (although these are now uncommon), MP3, GPS navigation, Bluetooth, etc. Many audio-only head units afford the user precise control over detailed audio functions such as volume, band, frequency, speaker balance, speaker fade, bass, treble, EQ and so on.

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Audi pinouts

BMW pinouts

  • BMW Bavaria C Reverse III 
  • 17 pin BMW Car Stereo proprietary
    BMW Car Stereo 17 pin (old) for BMW AUTORADIO, Bavaria C Bussines RDS, Bavaria C II By Blaupunkt (Germany), Bavaria C Reverse RDS, Bavaria C Exclusiv BE0729 (Germany), Bavaria C Professional RDS (Be1801), Business CD RDS (PH8060), Business CD, Business RDS, Business CD BP9272 made in Germany, Reverse (22DC595) by Philips (Germany), Reverse RDS (BE3250), Reverse RDS (BE3251), Reverse RDS (BP6262), Bussiness RDS BP3838 made in Portugal, Monitor, Navigation System by Philips, Professional RDS (Be6510) and some others
  • 40 (16+12+12) pin Head Unit / Car Stereo Quadlock
    BMW Quadlock connector 
  • 17 pin BMW Car Stereo proprietary
    BMW X5 Head Unit 

 
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