Porsche or Volkswagen Head units pinouts  > Volkswagen pinouts

Head unit pinout abbreviations

Pin
Notation
Pin function

Power pins

KL.30 Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
S Ignition powered. +12 V with the ignition key is in the ACC or ON position.
lightbulb image Backlight adjustment
__/ +--- Switched power out

Audio pins

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

Misc. pins

strikeout speaker This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
16 (8+8) pin Car Stereo ISO  connector layout
16 (8+8) pin Car Stereo ISO  connector
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Volkswagen ALPHA 4 visual pinout:
Volkswagen ALPHA 4 diagram
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