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Metra 70-1857

Tuner Relocation and Bose Integration Harness for Select GM Vehicles

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List price $79.99

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Arrives by Monday, Oct. 31 to zip 94107

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Product Features:

  • 17" Tuner relocation bypass harness and Bose amplifier integration harness
  • Retains factory Bose system
  • Includes antenna extension
  • 21-pin plug
  • Allows for the installation of an aftermarket radio using the existing factory wiring and connectors
  • Harness bypasses the remote tuner in select GM Vehicles while allowing the factory Bose system to function
  • 1-year Manufacturer's Warranty

Compatibility List:

  • Cadillac:
    • 1987 -1993 Allante
    • 1990-1992 Brougham
    • 1994-1995 DeVille
    • 1992-1995 El Dorado
    • 1993-1995 Fleetwood
    • 1992-1995 Seville (STS, SLS)
  • Chevrolet:
    • 1990 -1996 Corvette

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 a Car Stereo & Bypass the Factory OEM Amplifier
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 Deville
Cadillac El Dorado
Cadillac Seville

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.
Compatible Premium Audio Systems
Some vehicles have higher end audio systems installed in them by the manufacturer. This specifies which premium audio systems this item is compatible with.
Standard Bose
On-Star Compatible
This means that the harness is compatible with vehicles that have On-Star built-in.
CAN-BUS Compatible
CANBUS Ballasts ensure compatibility with ALL vehicle makes and models without the need for additional accessories. In addition, they have built-in Anti-Flickering Capacitors to help prevent lighting issues caused by voltage spikes and drops by stabilizing the power.
GM-LAN Compatible
This means that the item is compatible with GM-LAN systems.
Compatible with Aftermarket Navigation Systems
This means that the item is made to work with aftermarket systems with navigation. Typically, this means that the harness has wires that are used with GPS navigation systems, such as VSS wires and others. Please read the product description for full details of this feature.
Chime Retention
This means that the harness is able to retain the vehicles chimes.

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
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1 Star

Average Attribution Rating


hartland, WI

worked great

December 3, 2010

had no issues with product

11 of 14 found this helpful

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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 70-1857