Skip Navigation

Metra 70-1857 Bypass Harness

Allows you to connect a new car stereo in select Bose®-equipped 1990-96 GM vehicles

30 Reviews | 2 questions - 2 answers

Find what fits your vehicle

Can't find your exact vehicle?

Item # 120701857

In Stock

Add to Cart

Ask an expert

Our VA-based experts can help.

1.888.955.6000

ChatEmail

Overview

Our take on the Metra 70-1857 Bypass Harness

Metra's 70-1857 bypass harness lets you replace the factory radio in select Bose®-equipped 1990-96 GM vehicles using the existing wiring and connectors. This harness bypasses the remote tuner in certain vehicles, while retaining use of the Bose® audio system. Warranty: 1 year.

Metra's 70-1857 bypass harness lets you replace the factory radio in select Bose®-equipped 1990-96 GM vehicles using the existing wiring and connectors. This harness bypasses the remote tuner in certain vehicles, while retaining use of the Bose® audio system. 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.

Works great, used it on my 96 corvette with the Bose.

Jon, Phoenix AZ

What's in the Box:

  • Receiver wiring harness (includes antenna cable)
Reviews

Metra 70-1857 Bypass Harness Reviews

Average Customer Review(s):

(30 Reviews)
rewards card

Submit a review and enter to win a $350 rewards card

Review this product

Thanks for submitting your review

Most reviews are processed and published within 5 business days. You will receive a confirmation email once your review has been published.

Your Review

Use the stars below to rate the overall product on a scale of 1-5
1500
Upload your photos

Not visible. Email associated with order.
(e.g., Charlottesville, VA)

Additional Fields (optional)

500
500

By submitting this review, you agree to our terms and review guidelines.

Filter by rating

Customer photos


<< >>
Details

Hands-on research

Product Research

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 & sold separately.

Wire Code Chart:

Wire Color Function
Black (thick cable) Antenna Cable
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black (3) Ground
Blue Power Antenna
White RCA Left Front Channel
Gray RCA Right Front Channel
Green RCA Left Rear Channel
Violet RCA Right Rear Channel

Notes:

  • There are three ground wires in the harness; all three should be connected to the new receiver's ground lead.
  • The male RCA plugs on the harness are plugged into the front and rear line-level outputs on the new receiver.

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

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Recommended by advisor [ Richard  May 01, 2017 ]
Site recommendations [ Stanley  Apr 28, 2017 ]
needed to easily interface after market reciever into specific vehicle and retain as is vehicle wiring harness [ William  Feb 20, 2017 ]
this eliminates problems with old Bose system [ christopher  Dec 13, 2016 ]
adapter cable for stereo, needed and good price [ Kim  Jun 28, 2016 ]
came with kit [ DENNIS  May 15, 2016 ]
New head unit for 1991 Corvette ZR-1 [ PETER  Jan 26, 2016 ]

2 questions already asked

If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/. [ Krissy  Aug 01, 2016 ]  Staff
You can check to see if this will fit your vehicle by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Krissy  Mar 21, 2016 ]  Staff
Articles

Searches related to the Metra 70-1857 Bypass Harness Allows you to connect a new car stereo in select Bose®-equipped 1990-96 GM vehicles