Metra 70-8116 Amp Bypass Harness

Allows you to install a new car stereo and bypass the factory amp in select 2000-06 Toyota vehicles

Item #: 120708116

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Metra's 70-8116 harness lets you install an aftermarket stereo in select 2000-06 Toyota vehicles, bypassing the factory amplifier. The harness includes a 17-foot 16-gauge cable that connects at one end to the output plug of your factory amplifier, and on the other end to your aftermarket receiver. Warranty: 1 year.

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

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 70-8116 Amp Bypass Harness Reviews

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Metra 70-8116 Amp Bypass Harness

Written By Tom R, Maryland on Monday, April 06, 2015

Crutchfield Customer Review (What's this?)

Works great. You'll need upholstery tools to get to the amp plug behind the rear seats in the 2002 Highlander w/ JBL. I cut the 4 wires for the subwoofer since they weren't required. Ran the wires under the R passenger door trim up to the radio. Would be nice if there were instructions on how to get to the rear amp plug...

Pros: Works great.

Cons: Getting to rear amp plug is not that difficult, but there were no instructions on how to get to it.

Toyota Landcruiser owners must read

Written By Anonymous, Ohio on Saturday, June 21, 2014

If you own a 2000-2002 toyota landcruiser, this will work but is not plug and play. First off, Toyota has a feedback loop for power to the head unit via the factory amplifier. The radio connections in the upper dash have several feeds coming from the factory amplifier. So if you use the factory connections in the upper dash and you are changing out the amplifier you will need to tie wires together at the amp location for power, accessory and ground. In this kit, there's the 17ft long speaker harness that plugs into the amplifier under the passenger seat and there's also another harness that has red, yellow ground and blue.. This is where the problem is. By simply plugging in the harness behind the old radio, your new headunit won't work. You must remove three wires under the passenger seat and crimp or solder them for your power. Also the ground wire must be attached to the chassis and not your typical "black" wire behind the radio. I called Crutchfield support twice and they only had the info on the ground wire. THIS ONLY PERTAINS TO THE 2000-2002 Landcruiser.

Crutchfield response on Tuesday, July 01, 2014 This is the kind of problem that our Tech Support team loves to solve. They have looked into it and will be adjusting our database for this harness. As a Crutchfield customer, any time you run into an unexpected problem, our support and troubleshooting is only a phone call or email away.


Written By benW, maui, HI on Wednesday, October 09, 2013

Crutchfield Customer Review (What's this?)

Cherry connection

Does the job - needs more info when bypassing amp

Written By rsc10, Ft Wayne, IN on Sunday, September 29, 2013

Crutchfield Customer Review (What's this?)

It works well and the wiring instructions were fine, It did not include instructions on bypassing the amp however. I had to call for tech help a couple of times. Also, when bypassing the amp you lose the use of the large 'woofer' speaker on the rear deck - that was never disclosed either. Installed on a 2002 Avalon with JBL system (4 speakers plus woofer).

Worked Great!!!

Written By GaryF, Raton, NM on Friday, July 19, 2013

Crutchfield Customer Review (What's this?)

The Metra Factory Integration Adapter worked great. It was easy to install without cutting any factory wires. When I get ready to get rid of this car I could put the factory system back in in less than 30 minuets. Glad I found this before I started cutting the factory harness out.

Perfect Fit

Written By Morgan S., Salina, KS on Monday, June 17, 2013

Crutchfield Customer Review (What's this?)

Used on my 2002 Toyota Avalon. The instructions were very clean and all the colors matched up perfectly to my new head unit.

Pros: Plugged it in and was ready to reinstall my trim.

Cons: Had way to much extra wire. Probably around 10 extra feet.

Extra wiring needed at the amp

Written By JJ, Pa on Wednesday, October 10, 2012

Crutchfield Customer Review (What's this?)

Adapter works, I have 2000 Toyota landcruiser, no issue with the HU harness adapter. However there are two wiring harness with the factory amp. If you just plug in the metra adapter, without making 3 other wire bypass connections, your radio will not have power. Since Toyota radio power is getting feed from the amp. I was on phone with Crutchfield about this 3 times. Even the crutchfield techs weren't aware of that.

Pros: Fits peferct

Cons: Not a plug and play, need extra wiring

Metra 70-8116 Amp Bypass Harness

Written By Anonymous, Massachusetts on Saturday, March 24, 2012

Crutchfield Customer Review (What's this?)

Worked fine with my 2001 Land Cruiser for the connections that were provided on the adapter.

Pros: Good wiring diagram included.

Cons: Note: there is no connection for the Illumination wire using the adapter (even though it exists on the factory radio harness) - an additional splice must be made from the new head unit harness into the original factory radio harness.

Metra 70-8116 Amp Bypass Harness

Written By Jay, Costa Mesa, CA on Wednesday, September 28, 2011

Crutchfield Customer Review (What's this?)

Worked perfect

Amplifier Bypass Plug and Harness

Written By Norm, Centennial, Colorado on Monday, February 08, 2010

Crutchfield Customer Review (What's this?)

The hard part here was finding the location of the Amplifier behind the rear seat under the carpet in the cargo area before I could plug in the Bypass plug. I called tech support and they emailed me pictures that were very helpful in finding the amp to bypass.

Hands-on research

What's in the box?

Download owner's manual

  • 7.5" Power harness
  • 17' Amp bypass 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
Blue Power Antenna

(Speaker Harness)      

Wire Color Function
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 -
Green/White Subwoofer 1 +
White/Red Subwoofer 1 -
Brown/Yellow Subwoofer 2 +
Brown/Blue Subwoofer 2 -

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 output harness of the external factory amp and then run up to your in-dash aftermarket head unit for speaker wire connection.

Note: An external aftermarket amplifier is recommended to connect the factory subwoofer channels (if present) of the wiring harness in order to power your vehicle's factory subs.

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.

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