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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

This Metra 70-1728 harness allows you to bypass the factory amplifier in select 2006-up Hondas with the...

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This Metra 70-1728 harness allows you to bypass the factory amplifier in select 2006-up Hondas with the...

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Item # 120701728

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About the Metra 70-1728 Amp Bypass Harness

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.

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.

READ LESS

What's in the box:

  • 8" Power harness
  • 17' Speaker harness
MFR #70-1728C

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Metra 70-1728 Amp Bypass Harness reviews

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Metra 70-1728 Amp Bypass Harness

Crutchfield customer from Defiance, OH on 9/15/2019

2008 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

This harness worked great once I found the amplifier under the drivers seat! Instructions were clear and concise. Wiring was extra long, so there is plenty of left overs! :)

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1728 Amp Bypass Harness

Crutchfield customer from Mc Gehee, AR on 6/5/2019

2006 Honda Civic EX

Verified customer (What's this?)
Verified employee purchase (What's this?)

Works wonderfully. Way too much wire for my car though.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1728 Amp Bypass Harness

Crutchfield customer from Auburn, WA on 6/1/2019

Verified customer (What's this?)
Verified employee purchase (What's this?)

Great product, after unwinding the miles of wires, necessary to reach all parts of the car. Prevents all the 'wiring' issues when you replace the stock head unit with a new one and are installing a new, aftermarket amp.

Pros: All

Cons: None

Crutchfield response on

0 of 0 found this helpful

Metra 70-1728 Amp Bypass Harness

Christian from Alexandria, VA on 1/5/2019

2007 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

Just what I needed

Pros: fits perfect

Cons: none

Crutchfield response on

0 of 0 found this helpful

Metra 70-1728 Amp Bypass Harness

Jeffery from Mc Lean, VA on 12/14/2018

2007 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

This worked great. Yes, it's a bit long, but you have to remember the civic sedan has the amp under the drivers seat. But it still has excess, I guess for possibly other cars. Overall, it's a great harness, and plug and play with the factory premium audio wiring to bypass the amp.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1728 Amp Bypass Harness

Crutchfield customer from Columbus, OH on 6/1/2018

2007 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

Easy to install

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1728 Amp Bypass Harness

Frank from San Antonio, TX on 4/25/2018

2009 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

Took all the guess work out of installing aftermarket stereo to aftermarket amps. Was able to use factor wiring of speakers and circumvented factor amp. Greatly recommend this product.

Pros: Easy to use and saved LOTS of time.

Cons: none

Crutchfield response on

0 of 0 found this helpful

Metra 70-1728 Amp Bypass Harness

Philly from Tempe, AZ on 2/3/2018

2008 Honda Civic EX

Verified customer (What's this?)
Verified employee purchase (What's this?)

Easy to install, the extra long wires are a must depending on where your factory car audio amp is located. Warning! do not cut these wires until you have established the location of your amp, measure the distance, then add an extra 8-12" inch then cut.

Pros: Extra long wires, decent gauge, easy to determine each wire with the chart.

Cons: None

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0 of 0 found this helpful

Metra 70-1728 Amp Bypass Harness

Heath from Edison,OH on 9/25/2017

2006 Honda Civic EX

Verified customer (What's this?)
Verified employee purchase (What's this?)

works perfectly. only complaint is it comes with way to much wire. For some it could be intimidating.

Pros:

Cons: to much wire. you only need about 2ft.

Crutchfield response on

0 of 0 found this helpful

OEM connection

Rudy from Killeen texas on 7/2/2017

2007 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

Excess of wire but works perfectly for all speakers

Pros: Wiring sheet helps

Cons: Wire too long

Crutchfield response on

0 of 0 found this helpful

great harness

billy from farmville, nc on 3/15/2017

2007 Honda Civic EX

Verified customer (What's this?)
Verified employee purchase (What's this?)

Worked great for installing a Blaupunkt San Antonio in my Honda Civic EX coupe.

Pros: between the master sheet, the harness and the Crutchfield tech support...this system is failsafe!

Cons: none

Crutchfield response on

0 of 0 found this helpful

Works but not completely

Dustin from Ohio on 2/19/2017

Verified customer (What's this?)
Verified employee purchase (What's this?)

This set up has the wires for tweeters and subwoofer for the 06 civic but you are not able to use them the instructions do not give any details on the his either they are just there.

Pros: Gets sound to basic speakers

Cons: Does not get sound to tweeters and subwoofer (maybe fullrange)

Crutchfield response on

0 of 0 found this helpful

Metra 70-1728 Amp Bypass

Crutchfield customer from Phoenix, AZ on 1/21/2017

2008 Honda Civic EX

Verified customer (What's this?)
Verified employee purchase (What's this?)

The adapter did not work for my car. Therefore I can't rate it.

Pros:

Cons:

Crutchfield response on

0 of 1 found this helpful

great product

miles from Lewis Center, OH on 1/19/2017

2007 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

Does what its supposed to do. MUCH longer than what I needed, but cutting off excess wire is no biggie. Just makes it more tedious to run because fishing 12' of wire through little spaces is kind of a pain. The wires were zip-tied together every so often, so that helped.

Pros: works

Cons: none

Crutchfield response on

0 of 0 found this helpful

Metra 70-1728 Amp Bypass Harness

Crutchfield customer from Charlotte, NC on 12/8/2016

2008 Honda Civic EX

Verified customer (What's this?)
Verified employee purchase (What's this?)

Simple instructions and easy installation!

Pros:

Cons: Wires entirely too long for a simple amp bypass to the head unit. Probably going to have to cut them down.

Crutchfield response on

0 of 0 found this helpful

Gets the job done with minimal fuss

Crutchfield customer from Ft Collins, CO on 8/22/2016

2007 Honda Civic EX

Verified customer (What's this?)
Verified employee purchase (What's this?)

Works great. Color coding was spot on. -1 star for insane length (way to long) for my application.

Pros: Works to bypass factory amp.

Cons: For my application way to long. Had to shorten by ~5 feet.

Crutchfield response on

0 of 0 found this helpful

Riding the musical highway until I hit the bypass

andre k from Eureka, CA on 5/24/2016

2007 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

Before I had this my music sounded mediocre at best. After tethering this harness to my system-Big Badda Boom! I now have a rocking' car stereo.

Pros: Lots of extra length to make sure you have enough for your install. Plus with the multi-colors it looks like peel and eat twizzlers. (Please note this installation was done by a professional who did not eat them like twizzlers as you should not).

Cons: Kind of pricey, but what are you gonna do? When you need it, you need it.

Crutchfield response on

1 of 1 found this helpful

A nightmare turned easy

Bbear from Durham, NC on 4/9/2016

2009 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

Item worked very well a must have to bypass the week factory amp an run your own amp an lots of wire to reach your trunk or cut it an run it to the head unit great buy

Pros: Plug an play easy install

Cons: Opened the box an foam penuts went every where

Crutchfield response on

0 of 0 found this helpful

Bypass harness

Tim from Sacramento.California on 8/29/2015

2008 Honda Civic EX

Verified customer (What's this?)
Verified employee purchase (What's this?)

Arrived in three days.was exactly what I needed.

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

Cons: Non

Crutchfield response on

0 of 0 found this helpful

Was what I needed

Corey from Harrisburg PA on 5/8/2015

Verified customer (What's this?)
Verified employee purchase (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!

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1728 Amp Bypass Harness

Nick from Virginia on 4/9/2015

2007 Honda Civic EX

Verified customer (What's this?)
Verified employee purchase (What's this?)

Product works and arrived as expected.

Pros: Plenty of extra wire provided.

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-1728 Amp Bypass Harness

CPete from North Bend Oregon on 3/25/2015

2006 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (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.

Crutchfield response on

1 of 1 found this helpful

Easy!

Searcy from Searcy on 12/30/2014

2006 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

Super easy instal!

Pros: Simple to install

Cons: None

Crutchfield response on

1 of 1 found this helpful

awesome

Joel Z from dexter, NM on 12/24/2014

2009 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

its super long.

Pros: It's super long.

Cons: none.

Crutchfield response on

0 of 0 found this helpful

too long

David from APO Kaiserslautern, Ge on 1/27/2014

Verified customer (What's this?)
Verified employee purchase (What's this?)

Worked good but way to long for coupe install

Pros: Worked good quality wire

Cons: Rediculously long

Crutchfield response on

0 of 0 found this helpful

honda civic 06

honda from california on 7/9/2013

Verified customer (What's this?)
Verified employee purchase (What's this?)

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 ..

Pros:

Cons:

Crutchfield response on

1 of 2 found this helpful

works good

Crutchfield customer from manahawkin nj on 1/12/2013

2007 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (What's this?)

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

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

A pointless piece of the puzzle

John doe from Wyoming on 12/13/2012

2007 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (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.

Pros:

Cons:

Crutchfield response on

1 of 2 found this helpful

Works well in 2007 Honda Civic Si

Mr. Mike from Adamsville GA on 9/1/2012

2007 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (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

Crutchfield response on

2 of 2 found this helpful

Not for 2008 CRV EX-L

Matt from Chantilly, VA on 8/13/2012

Verified customer (What's this?)
Verified employee purchase (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

Crutchfield response on

1 of 1 found this helpful

WRONG PART!!

Lyadonna22 from Fayetteville, AR on 5/8/2012

2010 Honda CRV EX

Verified customer (What's this?)
Verified employee purchase (What's this?)

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?

Pros:

Cons:

Crutchfield response on

1 of 1 found this helpful

Ok for basic radio

car audio from woodbridge VA on 2/14/2009

2009 Honda Civic SI

Verified customer (What's this?)
Verified employee purchase (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.

Pros:

Cons:

Crutchfield response on

39 of 48 found this helpful

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Pros:

Cons:

Crutchfield response

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More details on the Metra 70-1728 Amp 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:

(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 (below the radio, behind the console). 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.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
need to bypass factory amp [ angel  Oct 22, 2018 ]
A
Didn't need this since replacing a bad aftermarket deck and already has a aftermarket harness which will use the factory amp. This just came as a package to the installation kit for the civic si sedan. All i needed was the dash kit and was cheaper to purchase a s whole kit. [ Waylon  Aug 24, 2018 ]
A
Reviews [ AVELINO  Jun 27, 2018 ]
A
I decided to save some money by bypassing my steering wheel audio controls and factory amp/sub. I'll see how the new system sounds with my factory speakers and may get an amp in the future. [ julian  Mar 27, 2018 ]
A
I didn't want to hardwire the factory one. [ Vladimir  Aug 25, 2017 ]
A
my son does not use the steering wheel controls and does not need the extra expense of keeping them [ Timothy  May 16, 2017 ]
A
Included in kit [ Gordon  Mar 17, 2017 ]
A
Came with the accessories package. [ Michael  Sep 22, 2016 ]
A
Needed to replace to your factory harness on an 8th gen civic, also the wires are way long so you will have to cut to desirable length. [ Michael  Sep 13, 2016 ]
SHOW MORESHOW LESS

4 questions already asked

Q
If I am using an aftermarket amplifier to power all speakers and do not want to use stock speaker wires can I completely ignore the bypass harness and just connect the power harness?
[ Thomas  Feb 01, 2018 ]
1 answer
A
Not sure if I understand you but if u don't want to use the factory speaker wires are you going to run new wires from your door speakers that seems like a lot of work ? But if u do that then yes u don't have to use the supplied speaker wires with the kit
[ matthew  Feb 02, 2018 ]
Q
Does this harness fit a 2008 Honda Civic Si with navigation?
[ Malachi  Apr 11, 2017 ]
1 answer
A
It looks like this Metra 70-1728 Amp Bypass Harness would be compatible with the '08 Civic SI (w/ navigation). You can also verify that online by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on installation and/or fitment please contact an Advisor by phone (1-800-324-9695) or online chat. Hope that helps!
[ Larry  Apr 17, 2017 ]  Staff
Q
With the bypass harness, do i just splice into the factory amp harness and leave it plugged into the factory amp or splice into the factory amp harness and leave it unplugged from the factory amp? Never done this before, very confused?
[ eddie  Mar 21, 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 connections on the product. 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/.
[ Kenny  Mar 21, 2016 ]  Staff
Q
where is the external amp on a 2008 honda civic coupe dx? the instructions said it was in the shifter console but the info I'm getting from the Crutchfield website says it's in the back of the car.
[ Zane  Jul 26, 2014 ]
3 answers
A
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 ]
A
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 ]
A
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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