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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

Abbreviations of head unit pinouts

Pin
Notation
Pin function

Power pins

Ub Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
A+, ACC, S-K, S-kont, SWA Ignition powered. +12 V with the ignition key is in the ACC or ON position.
ILL, LAMP, Lume, iLLUM Backlight illumination
ANT+, P.ANT Power for Electric Antenna. Output +12 V (maximum 150 - 300mA) 
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

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

 

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