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20 pin GM old proprietary connector layout
Разъем 20 pin GM old proprietary
at the car stereo

Meaning of Head Unit pinout signals

Pin
Notation		 Pin function

Power pins
BAT Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
IGN Ignition powered. +12 V with the ignition key is in the ACC or ON position.
DIM 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 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

 

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