• Metra 70-1858 21-Pin Radio Wiring Harness for Select GM Vehicles 1986-2005
  • Metra 70-1858 21-Pin Radio Wiring Harness for Select GM Vehicles 1986-2005 - product image 2
  • Metra 70-1858 21-Pin Radio Wiring Harness for Select GM Vehicles 1986-2005 - product image 3
  • Metra 70-1858 21-Pin Radio Wiring Harness for Select GM Vehicles 1986-2005 - product image 4
  • Metra 70-1858 21-Pin Radio Wiring Harness for Select GM Vehicles 1986-2005 - product image 5
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Metra

Metra 70-1858 21-Pin Radio Wiring Harness for Select GM Vehicles 1986-2005

Metra 70-1858 21-Pin Radio Wiring Harness for Select GM Vehicles 1986-2005

$14.99 USD
$14.99 USD
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Before you order

Buy with the right details confirmed

Review the application and system requirements

Confirm the size, power, connections, and included or separately required parts described on this page.

Metra 70-1858 is a 21-pin radio replacement wiring harness for select GM vehicles from 1986-2005. It connects an aftermarket radio to the factory radio plug for cleaner power and speaker wiring connections.

At a Glance

  • 21-pin radio replacement wiring harness for select GM vehicles
  • Connects to the factory radio plug for aftermarket radio installation
  • Color-coded leads support standard aftermarket radio wiring
  • Provides electrical power and four-speaker connections where applicable
  • 5-inch harness length for compact radio wiring connection

System / Wiring Notes

  • Large GM fitment range; verify exact year, model, trim, and connector before installation
  • Additional data interface may be required to retain chimes, steering wheel controls, or other factory features
  • This harness does not replace any required dash kit or antenna adapter

Exact Vehicle Compatibility

Find your vehicle below, then match the model year and factory-equipment details in the same row. Factory radio, amplifier, navigation, trim, speaker location, and connector differences can change which installation parts are required. If anything differs, contact MCOR before ordering.

Make Model Years Factory Equipment / Qualifier
Buick Century 1988-1989 Non-amplified factory audio system
Buick Century 1990-1996 Non-amplified factory audio system
Buick Electra 1988-1989 Non-amplified factory audio system
Buick Electra 1990 Non-amplified factory audio system
Buick LeSabre 1988-1989 Non-amplified factory audio system
Buick LeSabre 1990 Non-amplified factory audio system
Buick LeSabre 1991-1994 Non-amplified factory audio system
Buick Park Avenue 1988-1990 Non-amplified factory audio system
Buick Park Avenue 1991-1994 Non-amplified factory audio system
Buick Riviera 1986-1989 Non-amplified factory audio system
Buick Riviera 1990-1995 Non-amplified factory audio system
Buick Roadmaster 1991-1994 Non-amplified factory audio system
Buick Skyhawk 1988-1989 Non-amplified factory audio system
Buick Skylark 1987-1995 Non-amplified factory audio system
Cadillac Coupe DeVille 1988-1989 Non-amplified factory audio system
Cadillac Coupe DeVille 1990-1993 Non-amplified factory audio system
Cadillac DeVille 1988-1989 Non-amplified factory audio system
Cadillac DeVille 1990-1993 Non-amplified factory audio system
Cadillac DeVille 1994-1995 Non-amplified factory audio system
Cadillac Eldorado 1988-1991 Non-amplified factory audio system
Cadillac Escalade 1999-2000 Non-amplified factory audio system
Cadillac Escalade, Escalade EXT 2002 Non-amplified factory audio system
Cadillac Seville 1988-1991 Non-amplified factory audio system
Chevrolet Astro Van 1991-1995 Non-amplified factory audio system
Chevrolet Astro Van 1996-2005 Non-amplified factory audio system
Chevrolet Avalanche 2002 Non-amplified factory audio system
Chevrolet Beretta 1988-1990 With a/c; Non-amplified factory audio system
Chevrolet Beretta 1988-1990 Without a/c; Non-amplified factory audio system
Chevrolet Beretta 1991-1996 Non-amplified factory audio system
Chevrolet C/K Pickup 1995-2000 2001-up see Silverado; Non-amplified factory audio system
Chevrolet Camaro 1990-1992 Non-amplified factory audio system
Chevrolet Camaro 1993-1996 Non-amplified factory audio system
Chevrolet Camaro 1997-2002 Non-amplified factory audio system
Chevrolet Caprice 1991-1993 Non-amplified factory audio system
Chevrolet Caprice 1994-1996 Non-amplified factory audio system
Chevrolet Cavalier 1991-1994 Non-amplified factory audio system
Chevrolet Cavalier 1995-1999 Non-amplified factory audio system
Chevrolet Celebrity 1990 Non-amplified factory audio system
Chevrolet Corsica 1988-1990 With a/c; Non-amplified factory audio system
Chevrolet Corsica 1988-1990 Without a/c; Non-amplified factory audio system
Chevrolet Corsica 1991-1996 Non-amplified factory audio system
Chevrolet Express 1996-2000 Non-amplified factory audio system
Chevrolet G-Series Van 1988-1996 Non-amplified factory audio system
Chevrolet Impala 1994-1996 Non-amplified factory audio system
Chevrolet Lumina 1990-1994 Non-amplified factory audio system
Chevrolet Lumina 1995-2001 Non-amplified factory audio system
Chevrolet Lumina APV 1990-1992 Non-amplified factory audio system
Chevrolet Lumina APV 1993-1996 Non-amplified factory audio system
Chevrolet Malibu 1997-2000 Non-amplified factory audio system
Chevrolet Monte Carlo 1995-1999 Non-amplified factory audio system
Chevrolet S-10 Blazer 1990-1994 Non-amplified factory audio system
Chevrolet S-10 Blazer 1995-1997 Non-amplified factory audio system
Chevrolet S-10 Blazer 1998-2001 Non-amplified factory audio system
Chevrolet S-10 Blazer 2002 With DIN & 1/2 factory radio; Non-amplified factory audio system
Chevrolet S-10 Pickup 1989-1993 Non-amplified factory audio system
Chevrolet S-10 Pickup 1994-1997 Non-amplified factory audio system
Chevrolet S-10 Pickup 1998-2001 Non-amplified factory audio system
Chevrolet S-10 Pickup 2002 With DIN & 1/2 factory radio; Non-amplified factory audio system
Chevrolet Silverado 1500, 2500 1999-2002 Non-amplified factory audio system
Chevrolet Silverado 3500 1999-2000 Non-amplified factory audio system
Chevrolet Silverado 3500 2001 commercial; Non-amplified factory audio system
Chevrolet Silverado 3500 2001-2002 Non-amplified factory audio system
Chevrolet Silverado 3500 2002 commercial; Non-amplified factory audio system
Chevrolet Suburban 1995-1999 Non-amplified factory audio system
Chevrolet Suburban 2000-2002 Non-amplified factory audio system
Chevrolet Tahoe 1995-1999 Non-amplified factory audio system
Chevrolet Tahoe 2000-2002 Non-amplified factory audio system
Chevrolet Venture 1997-1999 Non-amplified factory audio system
GMC C/K Pickup 1995-1998 Non-amplified factory audio system
GMC Envoy 1998-2001 Non-amplified factory audio system
GMC G-Series Van 1988-1996 Non-amplified factory audio system
GMC Jimmy 1988-1991 full size; Non-amplified factory audio system
GMC Jimmy 1994 Non-amplified factory audio system
GMC Jimmy 1995-1997 Non-amplified factory audio system
GMC Jimmy 1998-2001 a.k.a. Jimmy Envoy; Non-amplified factory audio system
GMC S-15 Sonoma 1993 Non-amplified factory audio system
GMC S-15 Sonoma 1994-1997 Non-amplified factory audio system
GMC Safari 1991-1995 Non-amplified factory audio system
GMC Safari 1996-2005 Non-amplified factory audio system
GMC Savana 1996-2000 Non-amplified factory audio system
GMC Sierra 1500 1999-2002 Non-amplified factory audio system
GMC Sierra 2500 1999 Non-amplified factory audio system
GMC Sierra 2500/2500 HD 2000-2002 Non-amplified factory audio system
GMC Sierra 3500 2001-2002 Non-amplified factory audio system
GMC Sonoma 1998-2001 Non-amplified factory audio system
GMC Sonoma 2002 With DIN & 1/2 factory radio; Non-amplified factory audio system
GMC Suburban 1995-1999 Non-amplified factory audio system
GMC Yukon 1995-1999 Non-amplified factory audio system
GMC Yukon, Yukon XL 2000-2002 Non-amplified factory audio system
Isuzu Hombre 1996-1997 Non-amplified factory audio system
Isuzu Hombre 1998-2001 Non-amplified factory audio system
Oldsmobile Achieva 1992 Non-amplified factory audio system
Oldsmobile Achieva 1993-1995 Non-amplified factory audio system
Oldsmobile Bravada 1991-1994 Non-amplified factory audio system
Oldsmobile Bravada 1995-1997 Non-amplified factory audio system
Oldsmobile Cutlass Calais 1990-1991 Non-amplified factory audio system
Oldsmobile Cutlass Ciera 1988-1989 Non-amplified factory audio system
Oldsmobile Cutlass Ciera 1990-1994 Non-amplified factory audio system
Oldsmobile Cutlass Ciera 1995-1996 Non-amplified factory audio system
Oldsmobile Cutlass Supreme 1990-1991 Non-amplified factory audio system
Oldsmobile Cutlass Supreme 1992-1994 Non-amplified factory audio system
Oldsmobile Eighty-Eight 1989-1991 Non-amplified factory audio system
Oldsmobile Eighty-Eight 1992-1993 Non-amplified factory audio system
Oldsmobile Ninety-Eight 1989-1993 Non-amplified factory audio system
Oldsmobile Silhouette 1997-1999 Non-amplified factory audio system
Oldsmobile Silhouette APV 1990-1992 Non-amplified factory audio system
Oldsmobile Silhouette APV 1993-1996 Non-amplified factory audio system
Oldsmobile Toronado 1988-1993 Non-amplified factory audio system
Pontiac 6000 1990-1991 Non-amplified factory audio system
Pontiac Bonneville 1992-1993 Non-amplified factory audio system
Pontiac Bonneville 1994-1999 Non-amplified factory audio system
Pontiac Firebird, Firebird Trans Am 1990-1992 Non-amplified factory audio system
Pontiac Firebird, Firebird Trans Am 1993-2002 Non-amplified factory audio system
Pontiac Grand Am 1990-1991 Non-amplified factory audio system
Pontiac Grand Am 1992-1995 Non-amplified factory audio system
Pontiac Grand Am 1996-2000 Non-amplified factory audio system
Pontiac Grand Prix 1988-1989 Non-amplified factory audio system
Pontiac Grand Prix 1990-1991 Non-amplified factory audio system
Pontiac Grand Prix 1992-1993 Non-amplified factory audio system
Pontiac Grand Prix 1994-1996 Non-amplified factory audio system
Pontiac Grand Prix 1997-2003 Non-amplified factory audio system
Pontiac Montana 1999 Non-amplified factory audio system
Pontiac Sunbird 1989-1994 Non-amplified factory audio system
Pontiac Sunfire 1995-1999 Non-amplified factory audio system
Pontiac TransSport 1997-1999 Non-amplified factory audio system
Pontiac TransSport APV 1990-1992 Non-amplified factory audio system
Pontiac TransSport APV 1993-1996 Non-amplified factory audio system
Saturn S Series 1991-1994 Non-amplified factory audio system
Saturn S Series 1995-1999 Non-amplified factory audio system

Fitment note: Year and model alone are not always enough to confirm compatibility. Match every factory-equipment qualifier shown for your vehicle, and contact MCOR Automotive if the radio, amplifier, navigation, speaker, camera, trim, or connector details are uncertain.

Installation Notes

  • Confirm exact vehicle fitment, factory audio system, and radio connector before installation
  • Additional parts such as a dash kit, antenna adapter, steering wheel control interface, or data interface may be required for a complete installation
  • Professional installation is recommended for best results
  • Check current manufacturer instructions and vehicle application data before installation

What’s in the Box

  • Metra 70-1858 21-pin radio replacement wiring harness

Technical Specifications

  • Brand: Metra
  • Model: 70-1858
  • Product Type: Radio wiring harness
  • Application: Select Buick, Cadillac, Chevrolet, GMC, Isuzu, Oldsmobile, Pontiac, and Saturn aftermarket radio installations using the compatible 21-pin connector
  • Compatibility Type: Vehicle-specific
  • Connection Type: 21-pin GM radio connector
  • Harness Length: 5 inches
  • Speaker Support: Four-speaker connection where applicable

Identifiers & Packaging

  • MPN: 70-1858
  • UPC: 086429002573
  • Sold As: Each
  • Included Components: 21-pin radio replacement wiring harness

Why Buy From MCOR Automotive

  • Authorized retailer for the brands we sell
  • Specialists in vehicle audio integration, radio replacement parts, and installation accessories
  • 22+ years of professional automotive electronics experience
  • Expert support for compatibility verification and proper setup
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