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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

Maximum configuration. Top right connector (GSM Antenna Connector) and green connector (CVBS TV Tuner input)  may be absent in Minimal Configuration.

16 pin A connector

Pin
Number
MMI with minimal equipment MMI with maximum equipment
1 LF mute from preliminary setup for cell phone preparation   LF mute from preliminary setup for cell phone preparation
2 Voltage supply to Multimedia Control Head   Voltage supply to Multimedia Control Head
3 Wake UP to multimedia system control head   Wake UP to multimedia system control head
6 Reset to multimedia system control head   Reset to multimedia system control head
5 n/a Switch-on signal for the Cellular Telephone Amplifier
6 Reset to the Multimedia System Control Head Reset to the Multimedia System Control Head
7 Ring-break diagnostic cable   Ring-break diagnostic cable
9 n/a Switch-on signal to Telephone Baseplate
10 Data from multimedia system control head   Data from multimedia system control head
11  Data to the multimedia system control head   Data to the multimedia system control head
12  Terminal 31 (GND)   Terminal 31 (GND)
13 n/a DIAG signal from Telephone Baseplate
14 Reset from multimedia system control head   Reset from multimedia system control head
15 Terminal 30 (BAT+)   Terminal 30 (BAT+)
16 Ground (GND) to multimedia system control head   Ground (GND) to multimedia system control head

12 pin B connector (blue)

Pin
Number
MMI with minimal equipment MMI with maximum equipment
2   Microphone IN (+) for the microphone unit in front roof module (Right)
3   Microphone IN (-) for the microphone unit in front roof module (Right)
5   CVBS wire (-) from Rear View Camera System Control Module
8 Microphone IN (+) for the microphone unit in front roof module Microphone IN (+) for the microphone unit in front roof module (Left)
9 Microphone IN (-) for the microphone unit in front roof module Microphone IN (-) for the microphone unit in front roof module (Left)
11   CVBS wire (+) from Rear View Camera System Control Module

12 pin C connector (green)

Pin
Number
MMI with minimal or maximum equipment  
1 LF-In ground LF-In ground
2 Right LF-In Right LF-In
3 USB (+5V)  USB (+5V) 
4 USB (ground) USB (ground)
6 Detect  Detect 
7 Left LF-In Left LF-In
8 LF-In ground shielding LF-In ground shielding
9 CVBS cable (+) CVBS wire (+)
10 CVBS cable (-) CVBS  wire (-)
11 iPod data iPod data
12 iPod data iPod data

4 pin display unit Connector 

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

 4 pin USB Connector

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

Pins not mentioned are not connected. 

4 pin Audi Head Unit shaped  connector layout
4 pin Audi Head Unit shaped  connector
at the head unit
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Audi Q5 (2008-2015) MMI Unit visual pinout:click to enlarge
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