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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

Metra's 70-8117 harness allows you to bypass the factory amplifier in select 2003-07 Toyota models with the...

Find what Fits your car

Metra's 70-8117 harness allows you to bypass the factory amplifier in select 2003-07 Toyota models with the...

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Item # 120708117

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$44.99

About the Metra 70-8117 Amp Bypass Harness

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.

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.

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What's in the box:

  • 8" Power/ground harness
  • 17' Amp bypass harness
MFR #70-8117

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Metra 70-8117 Amp Bypass Harness reviews

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More details on the Metra 70-8117 Amp Bypass Harness

Stacey B.

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 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
*Yellow/Brown 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, Yellow/Brown, 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

 

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
bypassing the factory amplifier [ Fred  Mar 15, 2019 ]
A
crutchfield always has you covered . automatic option for my components install since im bypassing factory amp and using a component amp. [ James  Feb 12, 2019 ]
A
it's for my vehicle and I believe from the symptoms of what my current aftermarket radio is doing, this should help [ David  Jan 13, 2019 ]
A
as suggested [ John  Aug 03, 2018 ]
A
easy connection with this harness. no headaches [ T  Jul 30, 2018 ]
A
after reading forums on toyotanation it is very possible my audio problems are a result of the factory jbl / toyota amplifier. i would like to have both harness options at the time of the install [ S  Dec 29, 2017 ]
A
I need it to wire my new stereo to the factory harness. It makes my job a lot easier to install. [ BRUNO  Dec 21, 2017 ]
A
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 ]
A
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 ]
A
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 ]
A
needed to bypass my oem amp so I could adjust my jvc stereo unfiltered. [ Kim  Nov 29, 2016 ]
A
maximize sound quality potantial [ Lisa  Nov 28, 2016 ]
A
Good deal [ Victor  Oct 14, 2016 ]
A
Recommended for the installation [ William  Mar 22, 2016 ]
A
Needed for the radio install [ Mark  Dec 26, 2015 ]
A
Because the factory jbl amp is substandard for running the speakers i replaced in my tundra [ mick  Dec 09, 2015 ]
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5 questions already asked

Q
when using the the Metra 70-8117 Amp Bypass Harness, is my factory amp still powering the audio system?
[ Christian  Mar 22, 2020 ]
1 answer
A
No, when you use that harness the new aftermarket radio will be powering the audio system.
[ Cosmo  Apr 20, 2020 ]  Staff
Q
Does it work for a 2004 Prius with Nav and JbL?
[ Mark  Sep 13, 2017 ]
1 answer
A
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
Q
I assume the larger 20 pin connector plugs into the factory amp and then the wires are run up to the head unit where they are tied into the after market stereo wiring harness? Where does the smaller plug go? Does it plug into one of the factory plugs behind the head unit to bring power to the system?
[ Pete  Apr 20, 2015 ]
2 answers
A
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 ]
A
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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