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,COM. Chassis Ground
S-kont Ignition powered. +12 V with the ignition key is in the ACC or ON position.
sun icon Backlight illumination
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, Clock Head unit communication

 

36 (20+8+8) pin Head Unit / Car Stereo ISO connector layout
36 (20+8+8) pin Head Unit / Car Stereo ISO connector
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