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

Head unit pinout abbreviations meaning

Pin
Notation
Pin function

Power pins

Bup+ 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.

Audio pins

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

Misc. pins

Tel-m This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
GALA This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor.
K-BUS K-line bus
SW+B Battery power switch
SDA, SCL, MRQ Head unit communication
CD-IN L+, CD-IN L-, CD-IN R+, CD-IN R- CD-changer audio

 

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Blaupunkt 1U0 035 191A visual pinout:click to enlarge
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