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40 (16+12+12) pin QuadLock Fakra Head Unit / Car Stereo connector layout
40 (16+12+12) pin QuadLock Fakra Head Unit / Car Stereo connector
at the head unit
may be used to connect aftermarket MP3 player
The pinout should fit 11 devices/models. Click to list>

12 pin B connector

Pin
Number		 Function
1 Headphone audio signal output, right, positive
2 CD changer, left and right port, ground
3 Headphone audio signal output, right, negative
4 CD changer, voltage supply, positive
6 CD changer, data out bus (data exchange for CD changer control from radio navigation system to CD changer)
8 CD changer, left port audio, positive
9 CD changer, right port audio, positive
10 CD Changer, control signal
11 CD changer, data in bus (data exchange for CD changer control from CD changer to radio navigation system)
12 CD changer, clock bus (internal test protocol for monitoring data flow)
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Volkswagen (2003-2011) CD Changer visual pinout:click to enlarge
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