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20 pin GM old proprietary connector layout
20 pin GM old proprietary connector
was used in Chevrolet Buick Oldsmobile Pontiac Cadillac of 1986-1999 years

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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