Audi or BMW Head units pinouts  > Audi pinouts

Abbreviations of head unit pinouts

Pin
Notation
Pin function

Power pins

Ub + Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
S-kont Ignition powered. +12 V with the ignition key is in the ACC or ON position.
MUTE This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
GA This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor.

Audio pins

RF+ Front right audio out
LF+ Front left audio out
RR+ Rear right audio out
RL+ Rear left audio out
FR-, RF-, FL-, LF-, RR-, LR-, RL- The corresponding audio ground

Misc. pins

DATA IN, DATA OUT Head unit communication
K-BUS K-line bus
SW+B Battery power switch
DATA, CLOCK Head unit communication
46 (8+8+10+20) pin ISO 10487 Head Unit / Car Stereo connector layout
46 (8+8+10+20) pin ISO 10487 Head Unit / Car Stereo connector
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