Automotive Head units pinouts  > Audi pinouts
4B0 035 192P

Head unit pinout abbreviations meaning

Pin
Notation
Pin function
TEL MUTE This pin is used to silence the audio, earthed by some other external components that is connected to the radio.

Audio pins

R Right speaker out
L Left speaker out
RF+ Front right speaker out
LF+ Front left speaker out
RR+ Rear right speaker out
RL+ Rear left speaker out
FR-, RF-, FL-, LF-, RR-, LR-, RL- The corresponding speaker ground
LINE OUT, LINE-OUT LF, LINE-OUT RF Audio line out
LINE IN Audio line in

Misc. pins

CAN-L, CAN-H CAN bus
K-BUS K-line bus
SDA, SCL, MRQ Head unit communication
CDC-IN L+, CDC-IN L-, CDC-IN R+, CDC-IN R- CD-changer audio
RC-IN, RC-GND, /- RC +12V, FB-IN Remote control
 DWA-GND

anti-theft alarm system GND

KL30 is battery positive, hot at all times
KL31 is battery negative, connected all the time 

40 (16+12+12) pin Head Unit / Car Stereo Quadlock connector layout
40 (16+12+12) pin Head Unit / Car Stereo Quadlock connector
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