Pinouts >  GM Chevrolet, Buick, Pontiac, Saturn, Cadillac OEM car audio
20 pin GM old proprietary connector layout
20 pin GM old proprietary connector
at the car stereo
was used in Chevrolet Buick Oldsmobile Pontiac Cadillac of 1986-1999 years
The pinout should fit 29 device(s)/model(s). Click to list>

It was used on the Achieva, Astro, Jimmy, Bonneville and some other GMC vehicles up to 1999 year

GM21 connector 

has a bare shield wire for both front and rear speakers

GM21a connector 

has a bare shield wire for both front and rear speakers

 

GM21b connector 

has no bare shield wire and has common wires for front and rear speakers

GM21c connector 

has a positive and negative wire for each speaker
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