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Head unit pinout abbreviations

Pin
Notation
Pin function

Power pins

B+ Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
A+ Ignition powered. +12 V with the ignition key is in the ACC or ON position.
 lightbulb image Light-on signal or backlight adjustment. +12V supplied to light-on pin of head unit when tail lights ar turned on.
ANT+, P.ANT, ANT Power for Electric Antenna. Output +12 V (maximum 150 - 300mA) 

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-, SGND The corresponding speaker ground

Misc. pins

Mut This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
SDV This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor.
SDA, SCL, MRQ Head unit communication (information display and so on)

 

36 (20+8+8) pin Head Unit / Car Stereo ISO схематический вид разъема
Разъем 36 (20+8+8) pin Head Unit / Car Stereo ISO
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