General Features:

• Factory Reverse Wiring Harness
• Compatible with select 1987-2005 GM Vehicles
• 21-pin Plug plugs into OEM Radio
• Power and 4 speakers
• Plugs into car harness at radio
• Heat resistant turbowire for lasting a lifetime
• Allows installation of aftermarket radio using factory wiring and connector
• High quality, ABS plastic molded connector for the perfect fit
• Pre-stripped to make installation quick and easy
• No cutting of factory wiring needed
• Same as Metra 78-1858-1

Connection guide:

• Yellow – 12V Constant
• Red – 12V Accessory
• Black - Ground
• Orange – Dash Light Dimmer/Illumination
• Green – Lt Rear Speaker (+)
• Green with Black Stripe Lt Rear Speaker (-)
• White – Lt Front Speaker (+)
• White with Black Stripe – Lt Front Speaker (-)
• Purple – Rt Rear Speaker (+)
• Purple with Black Stripe – Rt Rear Speaker (-)
• Gray – Rt Front Speaker (+)
• Gray with Black Stripe – Rt Front Speaker (-)

Compatibility list:

• 1988 - 96 Century
• 1988 - 90 Electra
• 1992 - 94 Le Sabre
• 1988 - 94 Park Avenue
• 1989 - 91 Reatta
• 1988 - 94 Regal
• 1986 - 93 Riviera
• 1995 Riviera
• 1991 - 94 Roadmaster
• 1992 - 95 Skylark

• 1987 - 92 Brougham
• 1988 - 95 Deville
• 1992 - 95 Eldorado
• 1999 - 02 Escalade
• 2002 Escalade EXT
• 1988 - 92 Fleetwood
• 1992 - 95 Seville

• 1992 - 05 Astro
• 2001 - 02 Avalanche
• 1988 - 96 Beretta
• 1989 - 94 Blazer (Fullsize)
• 1992 - 2002 S-10 Blazer
• 1990 - 2002 Camaro
• 1991 - 96 Caprice
• 1988 - 99 Cavalier
• 1988 - 96 Corsica
• 1990 - 2004 Corvette
• 1989 - 1999 Crewcab / Dually
• 1996 - 2000 Express Van
• 1994 - 96 Impala SS
• 1990 - 2001 Lumina
• 1990 - 96 Lumina APV
• 1990 - 94 Lumina Z-34 (bose)
• 1997 - 2000 Malibu
• 1995 - 99 Monte Carlo
• 1988 - 98 Pickup Fullsize
• 1992 - 2001 S-10 Pickup
• 1999 - 02 Silverado Pickup 1500 - 3500
• 1989 - 2002 Suburban
• 1995 - 2002 Tahoe
• 1988 - 95 Van
• 1997 - 99 Venture

• 1998 - 01 Envoy
• 1989 - 91 Jimmy
• 1992 - 2001 S-15 Jimmy
• 1988 - 98 Pickup Fullsize
• 1992 - 93 S-15 Pickup
• 1989 - 2001 Pickup/Crewcab/Dually
• 1992 - 05 Safari
• 1999 - 2001 Sierra 1500 - 3500
• 1994 - 2001 Sonoma
• 1989 - 1999 Suburban
• 1988 - 95 Van
• 1992 - 2002 Yukon (Denali)
• 2000 - 02 Yukon XL

• 1996 - 2000 Hombre

• 1987 - 89 88 Royale
• 1992 - 95 Achieva
• 1991 - 2001 Bravada
• 1988 - 91 Cutlass Calais
• 1988 - 96 Cutlass Ciera
• 1989 - 94 Cutlass Supreme
• 1989 - 93 Eighty-Eight
• 1988 - 93 Ninety-Eight
• 1990 - 99 Silhouette
• 1989 - 93 Touring Sedan

• 1992 - 99 Bonneville
• 1990 - 99 Firebird
• 1988 - 2000 Grand Am
• 1988 - 2003 Grand Prix
• 1997 - 99 Montana
• 1989 - 94 Sunbird
• 1995 - 99 Sunfire
• 1990 - 99 Trans Sport

• 1991 - 94 SC/SL/SW/SC2/SL2/SW2
• 1995 - 99 SC/SL/SW

NOTES

• If Your Radio Does Not Contain A "Dimmer" or "Illumination" Wire, Then The Orange "Illumination / Dimmer" Wire In This Harness Will Not Be Used.
• Some functions like Steering Wheel Controls, speed sense, ext. may not be supported.