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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

Item # 120701856

This Metra 70-1856 bypass harness lets you replace the factory radio in select 1990-96 GM vehicles without the...

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This Metra 70-1856 bypass harness lets you replace the factory radio in select 1990-96 GM vehicles without the...

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Item # 120701856

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$44.99
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About 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.

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What's in the box:

  • Receiver wiring harness (includes antenna)
MFR #70-1856

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Metra 70-1856 Bypass Harness reviews

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16 reviews

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Pioneer radio installation in 1993 Corvette

Crutchfield customer from Harwood Heights, IL on 9/3/2019

1993 Chevrolet Corvette

Verified customer (What's this?)
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Perfect fit, very easy to instal, saved me money to install my new Pioneer radio my self. Thank you Crutchfield

Pros: Perfect fit

Cons: None

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0 of 0 found this helpful

Metra 70-1856 Bypass Harness

Crutchfield customer from Glendora, CA on 5/7/2019

1995 Cadillac Fleetwood

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Worked perfect for my application in my 1995 Cadillac Fleetwood.

Pros:

Cons:

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0 of 0 found this helpful

Metra 70-1856 Bypass Harness

Crutchfield customer from White Rock, NM on 3/28/2019

1996 Chevrolet Corvette

Verified customer (What's this?)
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Doesn't include wire for dimmer. Other than that it's great.

Pros:

Cons:

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0 of 0 found this helpful

Best Way to Wire the 1992 Cadillac Seville

Al from Lake Orion, MI on 12/15/2017

1992 Cadillac Seville

Verified customer (What's this?)
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Worked just as it should. Would make one suggestion, add a backup light wire and a video wire for a backup camera.

Pros: Perfect harness for the installation.

Cons: None

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0 of 0 found this helpful

Metra 70-1856 Bypass Harness

Crutchfield customer from Bakersville, NC on 5/22/2017

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I did the whole job by my self, only made possible by this product.

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Cons:

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0 of 0 found this helpful

Metra 70-1856 Bypass Harness

James from WINSTON-SALEM on 4/17/2017

1995 Chevrolet Corvette

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This is a Lifesaver If you have a C-4 Corvette !

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Metra 70-1856 Bypass Harness

Crutchfield customer from Omaha, NE on 4/5/2017

1994 Chevrolet Corvette

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This harness made the installation a breeze , without it I would still be pulling my hair out.

Pros:

Cons:

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2 of 2 found this helpful

Metra 70-1856 Bypass Harness

Crutchfield customer from Houston tx on 11/21/2016

1994 Cadillac Fleetwood

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Perfect for my 94 Cadillac fleet wood brougham.

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Works great

Mike from Texas on 8/28/2016

1994 Chevrolet Corvette

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Wires for plenty long everything plugged in just as expected

Pros: Ease of installation straightforward instructions

Cons:

Crutchfield response on

0 of 0 found this helpful

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

Razor from Michigan on 6/17/2015

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Needed this item it was a lifesaver

Pros: The best

Cons: None

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0 of 0 found this helpful

Effortless...Does the job

sjCohen from Wisconsin on 4/13/2015

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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

Crutchfield response on

1 of 1 found this helpful

Harness adapter

Pablo from Wi on 5/2/2014

1993 Cadillac Fleetwood

Verified customer (What's this?)
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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

Crutchfield response on

1 of 1 found this helpful

Makes the job soooo easy!

bigjim from Sparta, TN on 4/4/2014

1994 Cadillac Eldorado

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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!

Crutchfield response on

2 of 2 found this helpful

1993 Vette Wiring Harness

D01ATC from Denver, CO on 5/23/2013

1993 Chevrolet Corvette

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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.

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2 of 2 found this helpful

Metra 70-1856 Bypass Harness

Chris L from Greensboro NC on 2/9/2012

1993 Cadillac DeVille

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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.

Crutchfield response on

3 of 3 found this helpful

You Need This

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

Verified customer (What's this?)
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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.

Pros:

Cons:

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Cons:

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More details on the Metra 70-1856 Bypass Harness

Stacey B.

Product Research

Features

Wiring Harness: This wiring harness prevents 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 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 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 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
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 -

 

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
good item [ Michael  Nov 08, 2018 ]
A
I wanted a professional install, and I believe that I need to run the wiring back to the trunk, so this looked like the right option I needed to accomplish this task. [ Al  Nov 20, 2017 ]
A
To make installation easy [ Mike  Sep 26, 2017 ]
A
To help with the installation. [ George  Aug 01, 2017 ]
A
Works great and big time saver [ Razor  Jul 20, 2017 ]
A
the best deal and plus always follow your recommendations their always on point.......... [ romel  Jul 07, 2017 ]
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1 question already asked

Q
This connecter doesnt look like the one off the car. Is this the only one available? 93 cadillac fleetwood has 2 plugs. A small one with 4 wires and another one with 9 wires
[ Roberto  Sep 03, 2016 ]
1 answer
A
The Metra 70-1856 Bypass Harness is the only option we offer for a 1993 Cadillac Fleetwood. Our research file notes "The factory radio has a remote tuner module mounted in the trunk. Any electrical connections will need to made there and then all wiring will need to be extended back to the dash location." For more details or assistance, please feel free to speak to an Advisor by phone (888.955.6000) or online chat ("Contact Us" link at the top of the webpage). I hope that helps!
[ Larry  Sep 08, 2016 ]  Staff

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