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Metra 70-1856 Bypass Harness

Allows you to connect a new car stereo to factory wiring in select 1990-96 GM vehicles with non-Bose® systems

8 Reviews

Item #: 120701856

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Metra 70-1856 Bypass Harness

Overview

Our take on the Metra 70-1856 Bypass Harness

This Metra 70-1856 bypass harness lets you replace the factory radio in select 1990-96 GM vehicles without the factory Bose® system, using the existing wiring and connectors. This harness bypasses the remote tuner in certain vehicles. Warranty: 1 year.

This Metra 70-1856 bypass harness lets you replace the factory radio in select 1990-96 GM vehicles without the factory Bose® system, using the existing wiring and connectors. This harness bypasses the remote tuner in certain vehicles. Warranty: 1 year.

Please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this model is compatible with your vehicle.

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so. You can also call an Advisor for more information.

Wires for plenty long everything plugged in just as expected

Mike, Texas

What's in the Box:

  • Receiver wiring harness (includes antenna)
Reviews

Metra 70-1856 Bypass Harness Reviews

Average Customer Review:

8 Reviews

Works great

Mike from Texas on 8/28/2016

1994 Chevrolet Corvette

Wires for plenty long everything plugged in just as expected

Pros: Ease of installation straightforward instructions

Cons:

The bomb ,this made my installation go perfect thx Crutchfield!

Razor from Michigan on 6/17/2015

Crutchfield Customer Review (What's this?)

Needed this item it was a lifesaver

Pros: The best

Cons: None

Effortless...Does the job

sjCohen from Wisconsin on 4/13/2015

Installed in a 1995 Cadillac Seville SLS. Known to be an absolute "pain in the foot" to repair (even GM mechanics complained which brought a complete re-design by GM two years later), installing this wire harness was not only painless, but effortless. Extremely well made.

Pros: Easy Install, Quality Product

Cons: None

Harness adapter

Pablo from Wi on 5/2/2014

1993 Cadillac Fleetwood
Crutchfield Customer Review (What's this?)

Used for a 1994 fleetwood and made installation a breeze. I wrapped it in electrical tape to keep it all together during i stall

Pros: Makes DIY car installation easy

Cons: NONE

Makes the job soooo easy!

bigjim from Sparta, TN on 4/4/2014

1994 Cadillac Eldorado
Crutchfield Customer Review (What's this?)

Made the install of my new Kenwood DDX471HD so easy, it is a must have for anyone.

Pros: easy to install, great quality

Cons: NONE!

1993 Vette Wiring Harness

D01ATC from Denver, CO on 5/23/2013

1993 Chevrolet Corvette
Crutchfield Customer Review (What's this?)

This wiring harness was a lot if wire, probably about 10-12 feet worth. Had to obviously trim some, but got the job done.

Pros: Plenty of wire length.

Cons: Simply to much wire.

Metra 70-1856 Bypass Harness

Chris L from Greensboro NC on 2/9/2012

1993 Cadillac DeVille
Crutchfield Customer Review (What's this?)

This wiring harness does not match that of my 1993 Cadillac Sedan Deville,therefore can not use radio. It is missing one port.

Pros: Have none at this time.

Cons: Not functional.

You Need This

TechLauren from Milwaukee/Madison, WI on 5/9/2011

You can buy this or make it and it's going to be such a bear to install this wire bundle that you may as well give yourself a little break and buy this part. I installed mine in a 1995 non-bose Eldorado. The installation instructions were too general and I had to ask for help on the Cadillac Forums. The harness plugged into my CDM box in the trunk by the power antenna and the other wires all mated up perfectly with my new radio once I got them routed to the front of the car. There is was no way to install a modern head unit in my car without this part so I give it 5 stars as it was required and not optional for me. I ordered a crimper with it to get free shipping lol. I have photos but no video of it.

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Features

Crutchfield Wiring Harness: Crutchfield wiring harnesses prevent you from having to cut your vehicle's factory radio plug when replacing your factory radio with an aftermarket head unit. Simply solder or crimp the Crutchfield wiring harness to your aftermarket head unit's harness (solder & crimps not included), plug the aftermarket head unit's plug into the rear chassis of the aftermarket head unit, and plug the Crutchfield wiring harness into your vehicle's factory radio plug.

Note: Installation tools, hardware, & accessories are not included & sold separately. Please see the Accessories tab for recommendations & availability.

Wiring Notes: If the Crutchfield wiring harness is not equipped with a ground wire, you will need to ground the aftermarket head unit's ground wire to the metal chassis of your vehicle. Some vehicle's may require you to bypass the vehicle's factory amplifier (in another location from factory radio) or hardwire certain connections. If your vehicle is equipped with factory steering wheel controls, an additional adapter is required and sold separately.

Wire Code Chart:

Wire Color Function
Black (thick gauge) Antenna cable
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Ground
Blue Power Antenna/Amp Turn-On
Orange/White Dimmer
White Left Front Speaker +
White/Black Left Front Speaker -
Gray Right Front Speaker +
Gray/Black Right Front Speaker -
Green Left Rear Speaker +
Green/Black Left Rear Speaker -
Violet Right Rear Speaker +
Violet/Black Right Rear Speaker -

The Crutchfield Car Selector: Please visit the Crutchfield Car Selector for your specific type of vehicle.

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