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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 car stereo
p/n 8R2057152 ?

16 pin connector A (brown and black plugs)

Pin
Number
Pin
Name
Description
1   RR+   Right rear speaker (+)
2   FR+   Right front speaker (+)
3   LF+   Left front speaker (+)
4   LR+   Left rear speaker (+)
5   RR-   Right rear speaker (-)
6   FR-   Right front speaker (-)
7   LF-   Left front speaker (-)
8   LR-   Left rear speaker (-)
9   CAN H   CAN Bus high (Infotainment)
10   CAN L   CAN Bus low (Infotainment)
11 DISP_P Power Supply to Front Information Display Control Head
12   GND   Terminal 31
13 D_CAN CAN Bus (Display) to the Front Information Display Control Head
14 D_CAN CAN Bus (Display) to the Front Information Display Control Head
15   Batt   Terminal 30

12 pin B connector (blue plug)

Pin
Number
Pin
Name
Description
1 Left LF Left LF-In from the External Audio Source Connection
2 LF GND LF-In ground from the External Audio Source Connection
3 Ground Ground
4 Batt+ Permanent positive
6 DATA OUT  
7 Right LF Right LF-In from the External Audio Source Connection
8 Left Left signal
9 Right Right signal
10 ACC+ Positive switched
11 DATA IN  
12 CLK  

 12 pin C connector (green plug)

Pin
Number
Pin
Name
Description
1 Microphone IN (-)  
2 Right LF OUT  
3 LF OUT ground  
4 Microphone OUT (-)  
5 Left LF IN (-)  
6 LF (-) from the cell phone preparation/ Telephone Transceiver
7 Microphone IN (+)  
8 Left LF OUT  
9 Microphone OUT (+)  
10 LF mute wire from preliminary setup for cell phone preparation
11 Left LF IN (+)  
12 LF (+) from the cell phone preparation/ Telephone Transceiver

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Audi (2010-2017) Chorus III Head Unit visual pinout:click to enlarge
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