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13 pins connector

Head unit pinout abbreviations

Pin
Notation		 Pin function

Power pins
BAT+ Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
ACC+ Ignition powered. +12 V with the ignition key is in the ACC or ON position.
ILL Light-on signal or backlight adjustment. +12V supplied to light-on pin of head unit when tail lights ar turned on.
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
TEL 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 I2C bus communication (i.e. for on-board display)
SWC Steering wheel control buttons
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