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Metra 70-8117 Amp Bypass Harness

Connect a new car stereo and bypass the factory amplifier in select 2003-07 Toyota vehicles

16 Reviews | 3 questions - 4 answers

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Item # 120708117

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Overview

Our take on the Metra 70-8117 Amp Bypass Harness

Metra's 70-8117 harness allows you to bypass the factory amplifier in select 2003-07 Toyota models with the upgraded sound system. So, you get the benefits of the high-power amplifier that's built into your new radio. Simply unplug the connections to the amplifier, plug in the bypass cable, and connect it to the in-dash receiver of your choice. The speaker wire section of this adapter is 17 feet long, which means you'll be able to access the remote amp locations that Toyota used in many of these vehicles.

Metra 70-8117 bypass harness

Metra's 70-8117 harness allows you to bypass the factory amplifier in select 2003-07 Toyota models with the upgraded sound system. So, you get the benefits of the high-power amplifier that's built into your new radio. Simply unplug the connections to the amplifier, plug in the bypass cable, and connect it to the in-dash receiver of your choice. The speaker wire section of this adapter is 17 feet long, which means you'll be able to access the remote amp locations that Toyota used in many of these vehicles.

Please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this adapter 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.

Worked fine overall. Connector quality was a little cheap. The radio power connector did not lock together. The amp bypass harness was great, though. Saved me a ton of time, instead of running new wire.

Anonymous, Montana (MT)

What's in the Box:

  • 8" Power/ground harness
  • 17' Amp bypass harness
Reviews

Metra 70-8117 Amp Bypass Harness Reviews

Average Customer Review(s):

(16 Reviews)

Metra 70-8117 Amp Bypass Harness

Anonymous from Montana (MT) on 8/29/2017

2010 Dodge Ram 3500
Crutchfield Customer Review (What's this?)

Worked fine overall. Connector quality was a little cheap. The radio power connector did not lock together. The amp bypass harness was great, though. Saved me a ton of time, instead of running new wire.

Pros:

Cons:

Metra 70-8117 Amp Bypass Harness

Preston from Mckinney, TX on 8/27/2017

2004 Toyota 4Runner
Crutchfield Customer Review (What's this?)

Easy to use.. No issues.

Pros:

Cons:

Awsome

Brian from Florida on 4/26/2017

2004 Toyota Tundra
Crutchfield Customer Review (What's this?)

Worth it and helpful.

Pros: Quality, instructions, quality, quality, quality... Did I mention a quality item.

Cons: None.

Made installation a breeze ??

Brandt from Payson, UT on 4/25/2017

2006 Toyota Tacoma
Crutchfield Customer Review (What's this?)

Worked great for my 08 Tundra Double Cab. I installed the Pioneer AVH-2800BS Double Din DVD player :)

Pros: None

Cons: None

Works but lacks instructions

Joe from Wilmington, DE on 4/3/2017

2006 Toyota Tundra
Crutchfield Customer Review (What's this?)

The product works as advertised and provides more than enough wiring for my 06 Tundra Double Cab but the instructions are severely lacking. I had to youtube the fix for why my front speakers weren't working. Simple fix, but was annoying after spending the time to rewire everything.

Pros: it works

Cons: Instructions are lacking

Easy install

Sergio from Houston, TX on 2/5/2017

2005 Toyota Sequoia
Crutchfield Customer Review (What's this?)

Great harness Made install a breeze Just trim to fit Crutchfield rocks

Pros: Made extra long for many applications

Cons: None

Metra 70-8117 Amp Bypass Harness

Nathan from Tennessee on 12/24/2016

2004 Toyota Tundra
Crutchfield Customer Review (What's this?)

This product works as it should. 17 foot harness that might look intimidating, but it was very easy to route through my 04 tundra double cab

Pros:

Cons:

Works

Doug from Seattle, WA on 11/19/2016

2005 Toyota Tundra
Crutchfield Customer Review (What's this?)

Works as intended, But has way to many wires that I did not use.

Pros: It Works

Cons: Way to many extra wires

Metra 70-8117 Amp Bypass Harness

Anonymous from Boiling Springs, SC on 10/21/2016

2005 Toyota Tundra
Crutchfield Customer Review (What's this?)

Fit!! LOOOOOONG wires so you got 5 ft more then enough so your good to go. And for those that dont know why or how to bypass a factory amp, dont complain about doing it cause you may have to do some work for a change.

Pros: works

Cons:

Factory Toyota Amp = EVIL

john from Sioux Falls, SD on 9/26/2016

2004 Toyota Sienna
Crutchfield Customer Review (What's this?)

*2004 Toyota Sienna w/JBL.* So glad to finally solve the mysterious sound issues in my Gen 2 Toyota Sienna. The factory amp needed to be by-passed. I thought amps just amplified an input, but not this evil amp. It controlled the sound, monitoring it and decided where to allocate it. I got swirling sound (fader and balance) with variable "ghost" like EQ. With a new Sony head unit and some new speakers it was not allowing my system to function properly and HAD to go. This harness comes with yards of wire. I only needed enough to get from the head unit to the factory amp behind the glove box. The harness itself fit a little snugly, things are tight there under the amp in the glovebox anyway. I've noticed 2 Crutchfield harnesses lately that didn't seem to have an exact fit for me, but were close enough and ended up working OK. Wonderful improvement in sound and now I can tell my head unit actually has some clean power to it! I wish someone would've told me to bypass the stupid factory amp right from the start. I'm controlling the EQ and sound location now and able to use the remote app too! If you've got a Toyota factory amp, BY-PASS it!

Pros: easy to use. LOTS of wire.

Cons: lots of soldering

Wrong products

Jeff from lynn haven, FL on 3/25/2016

2005 Toyota Sienna
Crutchfield Customer Review (What's this?)

My fault I ordered the wrong wiring harnesses. Good news was Crutchfield immediately sent me the correct item with no fuss.

Pros: Great service from Crutchfield.

Cons: None.

Be ready for some work

Anonymous from Alabama on 12/29/2015

2005 Toyota Tundra
Crutchfield Customer Review (What's this?)

I fully understand the desire to bypass the factory amp and use the one with a new head unit, but the work involved in my particular application simply was not worth it. My '05 Tundra amp is on the back wall of the truck cab which means running all those wires back up to the front of the truck and into the dash to connect to the new head unit. The harness comes with plenty of wire, so if you are ready to find a way to run an entire bundle back to the front of the vehicle, it probably works well. I returned mine for a different harness that allows me to use the factory amp and all worked out well. Many thanks to the folks at Crutchfield for helping me sort through all the issues and find a solution that worked!

Pros:

Cons:

Amp Harnes

C. Walton from Texas on 12/29/2015

2006 Toyota Tundra
Crutchfield Customer Review (What's this?)

The amp harness was very easy to install and was very happy with the final product

Pros: Everything was great

Cons: None

Not worth the hastle

ChrisG from Anchorage, AK on 10/28/2014

2006 Toyota Tundra
Crutchfield Customer Review (What's this?)

This is a fat stack of wires that looks like a string of lights from Clark W. Griswold. In the end i only ended up using this for the rear door speakers as I had to rewire the front speakers to avoid that BS wiring job Toyota gave the JBL system.

Pros: Plugs right in, no cutting the factory harness. 16 gauge wires.

Cons: To many wires in the bundle since it tries to apply to several vehicle configurations. Makes it hard to run under the carpet/door sills.

Could be a lot easier

Frebo from Colorado Springs, CO on 8/18/2014

Crutchfield Customer Review (What's this?)

Instructions were not great. But got it to work in the end

Pros: It finally worked

Cons: Wire color codes were not accurate for my vehicle. Had to call for instructions and they acted as though i should have known that i should have used the brown/green stripe instead of the Green/brown stripe. Definitely took some time figuring out

Metra 70-8117 Amp Bypass Harness

Jason from Redding, CA on 12/31/2013

2005 Toyota Tundra
Crutchfield Customer Review (What's this?)

Excellent product. About 12' too long for use with my amps, but worked great. Does not come with the Toyota tundra JBL specific wiring diagram, but I was able to find one on a Toyota forum.

Pros: Ease of use

Cons: Lack of a complete wiring diagram.

Details

Hands-on research

Product Research

Features

Amp Bypass Harness: The Metra 70-8117 Power/Amp Bypass Harness consists of a 8" power/ground harness and 17' amp bypass harness. The 70-8117 is needed to bypass the factory amplifier in select 2003-2006 Toyota vehicles, when replacing the factory radio with an aftermarket head unit.

Note: Installation tools, hardware, & accessories are not included & sold separately. Please see the Accessories tab for recommendations & availability. If your vehicle is equipped with factory steering wheel controls, an additional adapter is required & sold separately.

Wire Code Chart:

Power/Ground Harness
Wire ColorFunction
Red+12 Volt Accessory
Yellow+12 Volt Constant
BlackChassis Ground
BluePower Antenna

 

Amp Bypass Harness
Wire ColorFunction
*Brown/WhiteCenter Speaker (+), Sub Coil 1 (+), or Right Front Tweeter (+), or Note Used
*Dark Blue/PinkCenter Speaker (-), Sub Coil (-), Right Front Tweeter (-), or Not Use
*Green/OrangeRear Twiddler Speaker (+), Sub Coil 2 (+), Left Front Tweeter (+), or Not Used
*Green/RedRear Twiddler Speaker (-), Sub Coil 2 (-), Left Front Tweeter (-), or Not Used
*Green/WhiteSub Coil 1 (+), Left Front Door Woofer (+), Left Front Tweeter (+), Sub Coil 2 (+), or Not Used
*White/RedSub Coil 1 (-), Left Front Door Woofer (-), Left Front Tweeter (-), Sub Coil 2 (-), or Not Used
*Brown/YellowSub Coil 2 (+), Right Front Door Woofer (+), Right Front Tweeter (+), Sub Coil 1 (+), or Not Used
*Brown/BlueSub Coil 2 (-), Right Front Door Woofer (-), Right Front Tweeter (-), Sub Coil 1 (-), or Not Used
WhiteLeft Front Speaker (+)
White/BlackLeft Front Speaker (-)
GrayRight Front Speaker (+)
Gray/BlackRight Front Speaker (-)
GreenLeft Rear Speaker (+)
Green/BlackLeft Rear Speaker (-)
PurpleRight Rear Speaker (+)
Purple/BlackRight Rear Speaker (-)

*Wiring Note: The Brown/White, Dark Blue/Pink, Green/Orange, Green/Red, Green/White, White/Red, Brown/Yellow, and Brown/Blue wires of the amp bypass harness provide a variety of functions based on your type of vehicle. Check the Installation Instructions for your specific type of vehicle and function.

Factory Amp Locations:

  • 4Runner: Behind passenger rear quarter panel
  • Matrix/Prius: Under passenger front seat
  • Sequoia: Under center console
  • Sienna/Solara: Behind glove box
  • Tacoma: On back wall near passenger side
  • Tundra: On back wall near drivers' side

 

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?

The tundra limited has a factory JBL amplifier in it. You have to bypass it or your stereo and speakers will sound awful[ William  May 19, 2017 ]
Don't think I will need this but couldn't find a way to exclude it, for the price wasn't a big deal.[ Chris  Jan 22, 2017 ]
I have an aftermarket radio with time alignment processor installed, and I want to bypass the factory amp which is heavily degrading the sound with its own built-in processing, and install my older aftermarket amp instead. I will eventually be replacing the speakers as well, but for now this will allow me to connect my amp without making new cable runs to the individual speaker locations (the existing wiring is fine), and without permanently modifying the vehicle's existing wiring.[ David  Dec 19, 2016 ]
needed to bypass my oem amp so I could adjust my jvc stereo unfiltered.[ Kim  Nov 29, 2016 ]
maximize sound quality potantial[ Lisa  Nov 28, 2016 ]
Good deal[ Victor  Oct 14, 2016 ]
Recommended for the installation[ William  Mar 22, 2016 ]
Needed for the radio install[ Mark  Dec 26, 2015 ]
Because the factory jbl amp is substandard for running the speakers i replaced in my tundra[ mick  Dec 09, 2015 ]

3 questions already asked

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.[ Kenny  Sep 13, 2017 ]  Staff
Yes to both questions. This way you do not have to splice into the factory harness, just plug this harness into the factory harness and splice into the head unit. It worked perfect on my '03 4Runner with the JBL system. Good luck.[ AVERY  Apr 22, 2015 ]
The 20 pin connector in this kit plugs into the harness that you unplug from the factory amplifier. This gives you access to the factory speaker wiring harness with out cutting off the factory 20 pin connector. (bypassing the amplifier) The smaller connector plugs into the factory radio wiring harness and is connected to your aftermarket head unit to provide constant and switched power and ground to it.[ Matthew  Apr 21, 2015 ]
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