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Abbreviations of head unit pinout

Pin
Notation
Pin function

Power pins

B+, BAT, Bup+, B/Up, B-U, MEM +12 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.
ANT+, P.ANT Power for Electric Antenna. Output +12 V (maximum 150 - 300mA) 
MUTE This pin is used to silence the audio, earthed by some other external components that is connected to the radio.

Audio pins

FR Front right audio out
LF Front left audio out
RR Rear right audio out
LR Rear left audio out
FR-, RF-, FL-, LF-, RR-, LR-, RL- The corresponding audio ground
LINE OUT Audio line out
IN-R, IN-L Audio line in

Misc. pins

Bus-IN, BUS-OUT, BUS-GND Head unit communication
RC-IN, RC-GND, RC+12V Remote control

 

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