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16 pin Radio Head Unit proprietary connector layout
16 pin Radio Head Unit proprietary connector

Head unit pinout abbreviations

Pin
Notation		 Pin function

Power pins
B+, BAT, Bup+, Ub+, B-U, MEM +12, KL.30 Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
A+, ACC, S-K, S-kont, SWA, KL.15 Ignition powered. +12 V with the ignition key is in the ACC or ON position.
ILL, LAMP, Lume, iLLUM, lightbulb image Light-on signal or backlight adjustment. +12V supplied to light-on pin of head unit when tail lights ar turned on. May be used for backlight adjustment in some models.
ANT+, P.ANT, ANT Power for Electric Antenna. Output +12 V (maximum 150 - 300mA) 
__/ +--- 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-, SGND The corresponding speaker ground

Misc. pins
MUTE, Mut, mu, TEL, TEL MUTE, strikeout speaker This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
GALA,GAL, GA, SCV, SDV This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor.
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Pioneer AVX-P7300 visual pinout:click to enlarge
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