Pinouts >  GM Opel, Chevrolet, Buick, Pontiac, Saturn, Cadillac car audio
was used in Chevrolet Buick Oldsmobile Pontiac Cadillac of 1986-1999 years
This pinout is associated with 26 compatible devices or models. Show them>

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

20 pin GM old proprietary of General Motors Chevrolet, Buick, Oldsmobile, Pontiac, Cadillac GM21 old car stereo connector connector layout
20 pin GM old proprietary connector
at the car stereo
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