Metra 70-2054

Factory Amplifier Bypass Harness for Select 1998-2004 GM Vehicles

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List price $49.99

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Arrives by Monday, Jan. 22 to zip 20147

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Metra Audio Store

Product Features:

  • Factory amplifier harness includes 17ft. of 16 Gauge wire
  • Harness can be plugged in at the factory amplifier and ran to the location of the aftermarket radio/amplifier
  • One 24-pin plug and one 8-pin plug
  • Allows for the installation of aftermarket radio using the existing factory wiring and connectors
  • No cutting of factory wiring is needed
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty
  • Check the Installation Instructions to see basic instructions and compatibility list for the Metra 70-2054


  • 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 (-)

Compatibility List:

  • Cadillac:
    • 2003 - 2004 CTS
    • 2000 - 2004 Deville
    • 2000 Escalade with Luxury system
    • 1998 - 2004 Seville
    • 2004 XLR with Bose system
  • Chevrolet:
    • 2002 - 2004 Avalanche
    • 2000 - 2002 BLazer with Bose
    • 2000 - 2002 S-10
    • 2001 - 2004 Suburban
    • 2001 - 2004 Tahoe
  • GMC:
    • 2000 - 2004 Envoy
    • 2000 - 2002 Jimmy with Bose
    • 2003 - 2004 Sierra
    • 2000 - 2002 Sonoma
    • 2001 - 2004 Yukon

Product History:

Metra 70-2054 thumbnail
(newest, current model)
Metra 70-2056 thumbnail
(previous model, replaced by Metra 70-2054)

Harness Features

Vehicle Sound System
This refers to what kind of sound system the vehicle has. Premium audio systems are generally name brand systems (such as JBL, Bose, Rockford Fosgate, etc) that have been installed inside a vehicle when it leaves the factory. Often they more advanced systems, complex wiring, factory amplifiers, and other features that can make installing aftermarket component difficult.
Premium Sound
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.
Install an Aftermarket Car Amplifier & Connect to Factory Radio
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.
Cadillac CTS
Cadillac Deville
Cadillac Escalade
Cadillac Seville
Chevy Avalanche
Chevy Blazer
Chevy S-10
Chevy Suburban
Chevy Tahoe
GMC Envoy
GMC Jimmy
GMC Sierra
GMC Sonoma
GMC Yukon

Premium Harness Features

Factory System Amplification
This refers to the factory sound system and whether the item is compatible with amplified or non-amplified systems.

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


elmira, ny

popcorn sounds no butter

April 7, 2014

i recieved this 2/0 power wires for my cadillac and its off the hook. works so good it didnt even fit my factory amps wiring harness. works great for remote wires or some led's or any other accessories you want too hook up.

18 of 21 found this helpful

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Knoxville, TN

Perfect Fit

December 31, 2015

The Metra 70-2054 fit perfect in my GTO's dash. The finish on the item was almost a perfect match.. Easy install once you remove the factory radio.

0 of 1 found this helpful

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Browse 4 questions and 15 answers
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Why did you choose this?
Sonic Electronix Store
this will make installation much easier by using factory wiring harness
jeff b on Nov 24, 2017
Fits my car
Gethsemane M on Aug 13, 2017
Nathan M on Oct 29, 2017
I choosed this item because i need it to install this unit
Emmanuel E on May 27, 2017
will this work on a 2001 tahoe with on star and sub?
A shopper on Aug 12, 2014
Best Answer: Hello,

Assuming your Tahoe has the RPO Code Y91 AND you wish to bypass the amp, then Yes. Please refer to the manual - linked below - to get familiar with the product and get details about your vehicle's compatibility.
Reply · Report · Customer SStaff on Aug 13, 2014
· Add Answer · I Have This Question Too (1)
I have a 2003 GMC Envoy XL, w/Premium Bose System & OnStar(no service).I'm installing a new JVC KD-R330 deck. I don't need a GMOS-04 interface if I buy the metra 70-2054 harness, right?
Phillip M on Mar 4, 2015
Metra 70-2054
Metra 70-2054
Axxess GMOS-04
Axxess GMOS-04
Best Answer: Sonic Electronix may not want me to tell you this, but there's an infinitely cheaper and easier solution to buying these adapters for most factory GM stereo installs.

Check your factory stereo harness, and look for either a pink or orange (it depends, if need be see if you can find a wiring diagram for your vehicle) wire, if you splice this wire to the Blue remote turn on wire, your stereo will then work great. I bought this harness for my dad's 2002 Chevy Avalanche, but for some reason these harnesses had messed up wiring diagrams so I ended up just sticking with the pink wire trick.

Hope this helps
Reply · Report · Frank L on Mar 5, 2015
· Add Answer · I Have This Question Too (0)
i have a 02 blazer that has a bose radio and factory amp under the arm rest area will this work to put in an aftermarket radio?
zack b on Jul 20, 2015
Best Answer: this wire set is for bypassing the amp for install an other amp if you just change de radio you need retaining accessory and amp factory with aftermarket radio
Reply · Report · Guillaume D on Jul 20, 2015
· Add Answer · I Have This Question Too (0)

Product Summary


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Internal Product ID


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 70-2054