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16 pin A connector

Pin
Number
Function
1   NF mute from preliminary setup for cell phone preparation
2   Voltage supply to Multimedia Control Head
3   Wake UP to multimedia system control head
6   Res MU to multimedia system control head
7   Ring-break diagnostic cable
10   Data from multimedia system control head
11   Data to the multimedia system control head
12   Terminal 31 (GND)
14   Res BT from multimedia system control head
15   Terminal 30 (BAT+)
16   Ground (GND) to multimedia system control head

12 pin B connector

Pin
Number
Function
2 Microphone IN (+) for the microphone unit in front roof module
3 Microphone IN (-) for the microphone unit in front roof module
5 FBAS wire (-) from Rear View Camera System Control Module
11 FBAS wire (+) from Rear View Camera System Control Module

12 pin C connector

Pin
Number
Function
1 LF-In ground
2 Right LF-In
3 USB (+5V) not on the internet access control module (2013 year or later)
4 USB (ground)
6 Detect not on the internet access control module (2013 year or later)
7 Left LF-In
8 LF-In ground shielding
9 FBAS wire (+)
10 FBAS wire (-)
11 iPod data
12 iPod data

 Following pins are also still connected with the internet access control module (from MY 13). 3 - USB (+5 V) 4 - USB (ground) 6 - Detect.

4 pin Audi Head Unit shaped  connector layout
4 pin Audi Head Unit shaped  connector
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Audi A4 (2008-2016) MMI Navigation Head Unit visual pinout:
Audi A4 (2008-2016) MMI Navigation Head Unit diagram
click to enlarge
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