Automotive Head units pinouts  > Mystery pinouts

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.

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

Amp Amplifier control
20 pins unspecified connector layout
20 pins unspecified connector
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