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Connectors at right left are GSM from radio (upper), GPS, external audio source,display unit, FBAS input from TV tuner.
52 multi-pin connector
Pin
Number
Description
A1
NF mute
A2
Voltage supply to multimedia system operating unit
A3
Wake-Up to multimedia system operating unit
A5
Switch-on signal to aerial amlifier for mobile telephone
A6
Res MU to multimedia system operating unit
A7
Open circuit diagnostic lead
A9
Switch-on signal to telephone bracket
A10
Data from multimedia system operating unit
A11
Data to multimedia system operating unit
A12
Terminal 31
A13
DIAG signal from telephone bracket
A14
Res BT from multimedia system operating unit
A15
Terminal 30
A16
Earth to multimedia system operating unit
Pin
Number
Description
B1
Microphone input (+) from microphone unit in front roof module (front right microphone )
B3
Microphone input (-) from microphone unit in front roof module (front right microphone )
B5
FBAS wire (-) from reversing camera system control unit
B8
Microphone input (+) from microphone unit in front roof module (front left microphone )
B9
Microphone input (-) from microphone unit in front roof module (front left microphone )
B11
FBAS wire (+) from reversing camera system control unit
Pin
Number
Description
C1
NF in, earth (low frequency)
C2
NF in, right-side (low frequency)
C3
USB (+5 V)
C4
USB (earth)
C6
Detect
C7
NF in, left-side (low frequency)
C8
NF in, screen earth (low frequency)
C9
FBAS (+)
C10
FBAS (-)
C11
Ipod data
C12
Ipod data
4 pin light-brown connector (for external audio source)
Pin
Number
Description
1
D (+)
2
iPod detected
3
D (–)
4
Earth
4 pin grey connector (for display unit)
Pin
Number
Description
1
LVDS (–)
2
LIN
3
LVDS (+)
4
Earth
Fuente:
https://pinoutguide.com/Car-Stereo-Audi/Audi_2012-2016_A5_S5_A4_S_pinout.shtml