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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
p/n 1K0035191D, 1K0035191H, 1K0035191HX

16 pin Main Audio Connector 

1 Right rear speaker, positive
2 Right front speaker, positive
3 Left front speaker, positive
4 Left rear speaker, positive
5 Right rear speaker, negative
6 Right front speaker, negative
7 Left front speaker, negative
8 Left rear speaker, negative
9 CAN high
10 CAN low
11 Radio muting (during telephone use)
12 Negative connection, terminal 31
13 Connector for ignition key-controlled switching on and off (S contact)
14 Alarm system terminal (optional)
15 Positive connection, terminal 30
16 Antitheft system control signal, SAFE

12 pin connector C

6 Telephone audio signal input, negative
12 Telephone audio signal input,  positive

12 pin B connector

2 CD changer, left and right port, ground
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)
7 AUX input, audio, right positive
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 RNS 300 Head Unit visual pinout:click to enlarge
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