Pinouts >  GM Chevrolet, Buick, Pontiac, Saturn, Cadillac OEM car audio  >  Buick pinouts
20 pin GM old proprietary connector layout
20 pin GM old proprietary connector
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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