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Metra 71-2003-1

Reverse Wiring Harness for Select 2000-Up GM Vehicles

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List price $29.99

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Metra Audio Store

Product Features:

  • Reverse Wiring Harness for Select 2000-Up GM Vehicles
  • Plugs into OEM Radio
  • Fully pinned harness
  • One 24-pin plug and one 12-pin plug
  • Harness is designed to plug in the factory radio
  • Can be used to repair a harness where the plugs have been cut off or damaged
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty
  • Check the Product Instructions to see basic instructions and compatibility list for the Metra 71-2003-1


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

Harness Features

Main Harness Function
Different installations on different vehicles require different harnesses. This type is what the harness is considered. Each wiring harness we sell serves a purpose such as installing an aftermarket car stereo, integrating an aftermarket amplifier with your factory car stereo, connecting Bluetooth to your factory car stereo, and more.
Replace Original Vehicle Stereo Wiring Plug (Male Side)
Compatible Vehicle Make
Allows you to view only items that are compatible with your vehicle's make. Does not guarantee that it will work with your vehicle year or model.
Compatible Vehicle Make and Model
The model of vehicle that this vehicle specific product is designed for. Please keep in mind that engine variations can affect the compatibility of the products.
Buick Century
Buick Enclave
Buick Lesabre
Buick Lucerne
Buick Park Avenue
Buick Rainier
Buick Rendezvous
Chevy Astro
Chevy Avalanche
Chevy Beretta
Chevy Blazer
Chevy Camaro
Chevy Caprice
Chevy Cavalier
Chevy Colorado
Chevy Express Van
Chevy Impala
Chevy Malibu
Chevy Monte Carlo
Chevy S-10
Chevy Silverado
Chevy Suburban
Chevy Tahoe
Chevy Trailblazer
Chevy Uplander
GMC Acadia
GMC Canyon
GMC Envoy
GMC Full Size Truck
GMC Savana
GMC Sierra
GMC Yukon
Pontiac Bonneville
Pontiac Firebird
Pontiac Grand Am
Pontiac Grand Prix
Pontiac Montana
Pontiac Sunfire
Pontiac Torrent
Saturn Relay
Saturn Vue

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Lancaster, PA

Great Value!!

April 22, 2010

Got the product and it was easy to install. Had fast and & great service. I will buy from Sonic again & would recommend it to anyone.

28 of 33 found this helpful

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Oklahoma City, OK

Just what I needed

February 14, 2015

The previous owner of my vehicle was an inbred, mouth-breathing idiot who thought it was a good idea to cut off the original harness to wire up an after market unit. Then, he tried to rewire the original harness when he traded in the truck, leaving the stereo with only one working speaker. I needed a harness that would give me the original connection with enough wire for a nice clean job. This harness worked perfectly, and the wiring diagram was spot on. Now the stereo sounds like it should.

25 of 33 found this helpful

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Reno, NV

What I needed

September 17, 2013

This connector is the same brand and manufacturer of the factory harness for my navigation system. It worked perfectly and was impossible to find any here but here

22 of 30 found this helpful

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Detroit, Mi

Great product

January 16, 2017

Easy to install, instructions are very clear. Went like clockwork.

0 of 0 found this helpful

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Beaumont, TX

Radio connectors

August 13, 2016

Plz send this to 305 Garland St. 77705 Beaumont Texts thanks so much this piece is really needed

0 of 0 found this helpful

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Sutherland Springs, TX

Verified Purchase
Quick fix.

March 17, 2016

Like the title says it's a quick fix if some how the factory harness is missing. If you have a 1998-2003 GMC Sierra 1500 extended cab there is a lot of useless wires that you just need to put aside and leave them. You will only use 13 wires out of the 24 wires. All and all it works and saves you from buying the 150 dollar OEM replacement harness.

0 of 0 found this helpful

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Browse 6 questions and 13 answers
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Why did you choose this?
Sonic Electronix Store
i needed a new harness for my stock radio after removing an after market radio. very simple fix and this site is fast/easy to work with
larry j on Mar 14, 2016
i wanted to put a 2000 year radio in a 1998 year vehicle
Robert M on Oct 27, 2015
Want to put the stock stereo back in my truck
Jim S on Nov 6, 2015
Guy before was a dope and cut out OEM plugin then installed everything wrong
Jesse B on Jan 18, 2015
need to put the stock radio back in my 2001 Pontiac Grand Am?
larry j on Mar 14, 2016
Best Answer: This might be exactly what you need if you're replacing the stock connector. It worked for my 2003 Chevy Silverado. One thing I remember from the installation is that, for my application, I did not need the small black connector. It may be different on your car. At any rate, the point may be moot since it says that the item has been discontinued.
Reply · Report · William C on Mar 14, 2016
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I have a 2003 chevy cavalier and i'm not sure what the smaller harness does on the 71-2003-1 oem radio harness?
Lauren D on Mar 9, 2015
Best Answer: That smaller harness may or may not be used on your particular vehicle. I believe it comes into play if the vehicle is equipped with a factory amp. However, your vehicle may be like my 2003 Chevy Silverado, which did not come with a factory amp. In this case, only the larger harness has any wires going to it.
Reply · Report · William C on Mar 9, 2015
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I need the car stereo wire harness for 2005 Trailblazer Ext, to install one aftermarket. The original radio is "Bose" .and also has "OnStar" ?
Thank you!
Myrna R on Aug 30, 2014
Best Answer: Hello Myrna,

You seek the Axxess GMOS-04 .

Axxess GMOS-04
Reply · Report · Customer SStaff on Aug 30, 2014
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2003 impala WITH factory amp WITHOUT onstar is this the correct harness for power and to send signal to the amp so it turns on with the aftermarket deck??
A shopper on Jan 21, 2015
Best Answer: Hello,

No. The Metra 71-2003-1 is a REVERSE Harness. This means its intended to be used If/When the OEM headunit is being re-installed.

You seek the Scosche GM09SR.

Scosche GM09SR
Scosche GM09SR
Reply · Report · Customer SStaff on Jan 21, 2015
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Will this work in a 2004 Pontiac Grand AM GT without monsoon sound system and without on star to replace OEM wiring harness that was cut out?
Jesse B on Jan 18, 2015
Best Answer: Hello Jesse,

Yes, this is the intended REVERSE harness.
Reply · Report · Customer SStaff on Jan 18, 2015
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Product Summary


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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Metra 71-2003-1