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20 pin GM old proprietary connector

This is proprietary (non-standard, product specific ) connector. A proprietary connector is the special connector that can only be used with a certain device(s).

This is the 20 pin GM old proprietary connector

20 pin GM old proprietary connector view and layout

20 pin GM old proprietary photo and diagram

The pinouts for the 20 pin GM old proprietary connector are:

Buick Delco 14179985 head unit pinout
Buick Delco 16194975 head unit pinout
Buick Delco-Loc-II 16220765 head unit pinout
General Motors Chevrolet, Buick, Oldsmobile, Pontiac, Cadillac GM21 old car stereo connector pinout for GMC Jimmy (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Chevrolet Astro (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Oldsmobile Achieva (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998), Buick Roadmaster (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996), Chevrolet Cavalier (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Cadillac Eldorado (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Seville (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Deville (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), GMC Sierra (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Sonoma (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Buick Skylark (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998), Electra (1986, 1987, 1988, 1989, 1990), Pontiac Safari (1986, 1987, 1988, 1989), Grand Prix (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Grand Am (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Firebird (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Bonneville (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Chevrolet Lumina (1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999), Caprice (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996), Camaro (1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999)