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Metra 70-1857 Bypass Harness

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

Item # 120701857

Metra's 70-1857 bypass harness lets you replace the factory radio in select Bose®-equipped 1990-96 GM...

Find what Fits your car

Metra's 70-1857 bypass harness lets you replace the factory radio in select Bose®-equipped 1990-96 GM...

Item # 120701857

In stock
C$59.99

About 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.

READ LESS

What's in the box:

  • Receiver wiring harness (includes antenna cable)
MFR #70-1857

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More details on the Metra 70-1857 Bypass Harness

Stacey B.

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.

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Customer Q&A

3 questions already asked

Q
Will this harness work with all new speakers and aftermarket Amp and subs?
[ Michael  Aug 26, 2019 ]
1 answer
A
This harness is to integrate an aftermarket radio into an existing factory audio system. To get the proper gear for your install, you should reach out to one of our advisors! https://www.crutchfield.com/support/ContactUs.aspx
[ Calvin  Sep 17, 2019 ]  Staff
Q
Installed an aftermarket amp, and speakers, but my headunit will not turn on when I start the car, will this solve the problem of my headunit not working? And will I still be able to hook up my aftermarket parts to the headunit?
[ kenzi  Jul 31, 2016 ]
1 answer
A
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
Q
Does the 70-1857 connect the head unit? For 1994 cadilac Deville Concours
[ John  Mar 21, 2016 ]
1 answer
A
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

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