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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

Item #: 120708117

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5 Reviews | 1 question - 2 answers

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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.

Metra 70-8117 Amp Bypass Harness Reviews

Average Customer Review:

5 Reviews

Be ready for some work

Written by: Anonymous from Alabama on December 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

Written by: C. Walton from Texas on December 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

Written by: ChrisG from Anchorage, AK on October 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

Written by: Frebo from Colorado Springs, CO on August 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

Written by: Jason from Redding, CA on December 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.

Hands-on research

What's in the box?

Download owner's manual

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

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. Please visit the Crutchfield Car Selector for vehicle compatibility.

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 Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Chassis Ground
Blue Power Antenna

 

Amp Bypass Harness
Wire Color Function
*Brown/White Center Speaker (+), Sub Coil 1 (+), or Right Front Tweeter (+), or Note Used
*Dark Blue/Pink Center Speaker (-), Sub Coil (-), Right Front Tweeter (-), or Not Use
*Green/Orange Rear Twiddler Speaker (+), Sub Coil 2 (+), Left Front Tweeter (+), or Not Used
*Green/Red Rear Twiddler Speaker (-), Sub Coil 2 (-), Left Front Tweeter (-), or Not Used
*Green/White Sub Coil 1 (+), Left Front Door Woofer (+), Left Front Tweeter (+), Sub Coil 2 (+), or Not Used
*White/Red Sub Coil 1 (-), Left Front Door Woofer (-), Left Front Tweeter (-), Sub Coil 2 (-), or Not Used
*Brown/Yellow Sub Coil 2 (+), Right Front Door Woofer (+), Right Front Tweeter (+), Sub Coil 1 (+), or Not Used
*Brown/Blue Sub Coil 2 (-), Right Front Door Woofer (-), Right Front Tweeter (-), Sub Coil 1 (-), or Not Used
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 (-)
Purple Right Rear Speaker (+)
Purple/Black Right 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

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Customer Q&A

Crutchfield asked  
Why did you buy this?

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 ]

1 question already asked

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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