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Metra 70-1728 Amp Bypass Harness

Connect a new car stereo and bypass the factory amplifier in select 2006-up Honda vehicles

Item #: 120701728

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14 Reviews | 1 question - 3 answers

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Metra 70-1728 Amp Bypass Harness

This Metra 70-1728 harness allows you to bypass the factory amplifier in select 2006-up Hondas with the factory-installed premium sound system. Simply unplug the connections to the amplifier, plug in the bypass cable, and connect it to the in-dash receiver of your choice. If you're not using a soldering iron, we recommend that you purchase some wire connectors to secure the connections. Check out our handy article on three ways to connect the wiring harness here.

If you haven't done so already, please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this item is compatible with your vehicle. Warranty: 60 days.

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.

Metra 70-1728 Amp Bypass Harness Reviews

Average Customer Review:

14 Reviews

Bypass harness

Written by: Tim from Sacramento.California on August 29, 2015

2008 Honda Civic EX
Crutchfield Customer Review (What's this?)

Arrived in three days.was exactly what I needed.

Pros: Customer service was very helpful, answered all my questions

Cons: Non

Was what I needed

Written by: Corey from Harrisburg PA on May 8, 2015

Crutchfield Customer Review (What's this?)

This harness was just what I needed to put a kenwood in my 2006 civic. I installed component speakers in the car so I would still have tweeters which I put in the factory location. I needed this to bypass the factory amp and it worked great. Just don't understand why it's 20 feet long!! I only needed a foot or two!



Metra 70-1728 Amp Bypass Harness

Written by: Nick from Virginia on April 9, 2015

2007 Honda Civic EX
Crutchfield Customer Review (What's this?)

Product works and arrived as expected.

Pros: Plenty of extra wire provided.


Metra 70-1728 Amp Bypass Harness

Written by: CPete from North Bend Oregon on March 25, 2015

2006 Honda Civic SI
Crutchfield Customer Review (What's this?)

This harness worked great and allowed me to do a fast install, the right way when saving my OEM speakers.

Pros: Great length of capable and instructions were easily read

Cons: This item was matched with my stereo and vehicle but the instructions didn't mention how to wire my tweeters. After I called Crutchfield I was able to go with my gut feeling and wire them in. For the first timer or average DIYer, this could cause issues. Make sure you ask questions if needed.


Written by: Searcy from Searcy on December 30, 2014

2006 Honda Civic SI
Crutchfield Customer Review (What's this?)

Super easy instal!

Pros: Simple to install

Cons: None


Written by: Joel Z from dexter, NM on December 24, 2014

Crutchfield Customer Review (What's this?)

its super long.

Pros: It's super long.

Cons: none.

too long

Written by: David from APO Kaiserslautern, Ge on January 27, 2014

Crutchfield Customer Review (What's this?)

Worked good but way to long for coupe install

Pros: Worked good quality wire

Cons: Rediculously long

honda civic 06

Written by: honda from california on July 9, 2013

Product is good but they still dont show u got to bypass the harness when i pay for the instructions that just show u were the amp is located ..



works good

Written by: Anonymous from manahawkin nj on January 12, 2013

2007 Honda Civic SI
Crutchfield Customer Review (What's this?)

Works perfect excepts wires are 400ft to long you gotta cut them



A pointless piece of the puzzle

Written by: John doe from Wyoming on December 13, 2012

2007 Honda Civic SI
Crutchfield Customer Review (What's this?)

I rated this a 4 because for the quality it's great, now if only I truly needed it..... I made my own essentially. So this is a waste of money for me. However now I've got labeled factory wires to wire anything else I may want to.



Works well in 2007 Honda Civic Si

Written by: Mr. Mike from Adamsville GA on September 1, 2012

2007 Honda Civic SI
Crutchfield Customer Review (What's this?)

There were no problems with the functionality of the harness. You will get wires that are about 14 to 16 feet long, so you will have to cut them as there will be no room behind your dash to stuff all that wire. This is no problem at all because I would much rather have too much wire than not enough. You will lose the use of your subwoofer and steering wheel controls, so an aftermarket amplifier and steering wheel control adapter will need to be purchased.

Pros: Works well

Cons: None

Not for 2008 CRV EX-L

Written by: Matt from Chantilly, VA on August 13, 2012

Crutchfield Customer Review (What's this?)

This harness is not needed on a 2008 Honda CRV EX-L with factory subwoofer; there is no amp to plug it in. Crutchfield techs were great though and sent me out the correct one, which installed easily.

Pros: NA

Cons: NA


Written by: Lyadonna22 from Fayetteville, AR on May 8, 2012

2010 Honda CRV EX

I'm sure this is a fine product for the right car, but Crutchfield sent this to me for use with my Honda CR-V and I had to go out and pick up the correct part. The wires are CRAZY long on this unit, too... Not sure why you would need that much, but I guess it's always nice to have options?



Ok for basic radio

Written by: car audio from woodbridge VA on February 14, 2009

2009 Honda Civic SI
Crutchfield Customer Review (What's this?)

This harness is ok only for basic aftermarket install as it will still require you to splice/tap into VSS/VSP wire even though it is present in the OEM connector. The 09 Si civic has two illumination wires and most radios only have one (this connector only has one) so it doesn't help. It is also important to note that you WILL lose your sub woofer with this harness if you do not get an amplifier as all aftermarket radios only have 4 channels. The Civic Si needs at least five (you can run the front mid's and tweeters in parallel off the same line (thanks Crutchfield for that advice, works great)). This will work great as I will soon buy an amp to get back my subwoofer. I think this harness should have had the VSP wire (that is common in GPS aftermarket units) as it IS in the OEM harness. As it is for the honda civic they should know and tell you that there is an issue with the illumination as well. You get tons of wire so there many options to run the harness. Center console to under the seat only takes about a third of what they give you. Good quality wire too! Hope this helps everyone looking at this.



Hands-on research

What's in the box?

Download owner's manual

  • 8" Power harness
  • 17' Speaker harness

Product Research


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:

(Power Harness)

Wire Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Ground
Orange/White Dimmer

(Speaker Harness)      

Wire Color Function
Yellow/Blue Left Front Tweeter +
Yellow/Black Left Front Tweeter -
Yellow/Red Right Front Tweeter +
Yellow/Orange Right Front Tweeter -
Green/White Subwoofer +
White/Red Subwoofer -
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 -

Harness Location: The factory plug that mates with the Power Harness is located in the factory radio cavity of the vehicle. The factory plug that mates with the Speaker Harness (used to bypass factory amp) is located at the external factory amp location (in rear of vehicle). The 17' Speaker Harness will need to be plugged into the external factory amp and then run up to your in-dash aftermarket head unit for speaker wire connection.

Note: An additional aftermarket amplifier is recommended if your vehicle is equipped with Front Tweeters, Front Speakers, Rear Speakers, & Factory Subwoofer.

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

Customer Q&A

1 question already asked

In my 06 EX it is in the center console, but I believe there are some models that it is under the driver's seat I believe. [ ERIC  Sep 12, 2014 ]
I remember getting that big bundle of wire that is pictured here, and I still have most of it. I dont recall having to go all the way to the trunk, and we did pop the console. I was wondering my self why there was so much wire with this adapter. Having to only go to the console gave us all that excess. By the way, my son's Civic is an '06 EX. Hope this was some help. [ RICHARD  Jul 26, 2014 ]
I know in a 2008 Civic Si, the amp is in front of the shifter console below the dash. I don't know about a DX but I would think it's in the same place. [ THEODORE  Jul 26, 2014 ]

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