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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
minimum and maximum equipment

Maximum configuration

Top right connector (GSM Antenna Connector) Blue Connetor (GPS), green connector (CVBS TV Tuner input)

Minimum configuration

16 pin A connector

Pin
Number
Minimum Equipment Maximum Equipment
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
5   Switch-on signal for the cellular telephone amplifier
6   Res MU to multimedia system control head
7   Ring-break diagnostic cable
9   Switch-on signal to telephone base plate
10   Data from multimedia system control head
11   Data to the multimedia system control head
12   Terminal 31 (GND)
13   Telephone base plate DIAG signal
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
Minimum Maximum
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
8 Microphone IN (+) for the microphone unit in front roof module (left front microphone)
9 Microphone IN (-) for the microphone unit in front roof module (left front microphone)
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) to the internet access control module (2013 year or later)
4 USB (ground)
6 Detect to 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

4 pin display unit Connector (purple)

Pin
Number
Function
1 LVDS (-)
2 LIN
3 LVDS(+)
4 Earth

 4 pin USB Connector (yellow)

Pin
Number
Function
1 D+
2 iPod detected
3 D-
4 Earth

Pins not mentioned are not connected. 

4 pin Head Unit LVDS shaped connector layout
4 pin Head Unit LVDS shaped connector
According to 2 reports in our database (2 positive and 0 negative) the Audi (2008-2016) A4, S4 8K MMI Navigation Head Unit pinout should be correct.

Is this pinout
Audi (2008-2016) A4, S4 8K MMI Navigation Head Unit visual pinout:click to enlarge
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