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I am curious, because I am about to embark upon swapping out my JBL in my 04 Tundra DC. Once you found the AMP, how hard would it have been (if I keep my existing speakers) to run the new wiring to the location of the old amp, replace the old amp with the new amp and the wiring from the new stereo, then the existing speaker wires just plug into the new amp? Basically, I am looking to just replace the stereo and amp and not wanting to run new wiring to the existing speakers if I do not have to (unplug from old AMP and plug into new amp). Based on what you did/saw, can this be done or is it back to the connectors again?

Two more questions: Where are the 7th and 8th speakers located in the Tundra DC? I have a pair by the handles in the front seat, a pair in the front doors, and a pair in the backseat doors, but can't find the 7th and 8th. Also, what after market stereo can push 8 speakers? Or are you relying on the amp to push the 8 speakers?
 

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GUYS!!! THIS IS SIMPLY NOT TRUE!

Metra makes a kit to install an aftermarket head unit to work in conjunction with your factory JBL amp and speakers. I have one in my Sequoia with a Kenwood DDX-7015. It sounds LEAGUES better than the factory head unit.

The Metra part number is 70-8113. If you need anything further, please ask.

John
I’m trying to use the metra 70-8113 on my 06’ Sequoia w/ JBL and can’t get any sound from the speakers. I don’t have a factory Nav system just the JBL 10 speaker system.
How did you do it?
 

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I think the harness you are using is for the non-JBL systems. The stock HU in your '06 uses a digital turn-on signal to turn on the JBL amp. I think you will need the Metra TYTO-01.
 

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I think the harness you are using is for the non-JBL systems. The stock HU in your '06 uses a digital turn-on signal to turn on the JBL amp. I think you will need the Metra TYTO-01.
I ended up buying the Metra TYTO-01 interface, but anyone who goes this route needs to splice the speaker level wires from the metra harness with RCA line ends so you’re able to use the line out ports on your new HU. If you use the speaker level wires from the new HU harness you’ll get a lot of distortion. Using the RCA line outs on the HU gives the amp the low level inputs that it needs, the speaker level wires overdrive the amp giving it way too much power. That was the issue I ran into, then I used the line out ports and it sounds FANTASTIC!!
 

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Yes, there are many issues with the JBL systems in the 05+ Gen 1's when it comes to replacing any component. I replaced my entire system with after-market, but that was way before Metra made any harnesses for this setup. Since you didn't mention a weak FM signal, I am assuming the new Metra harness supplies switched power to the FM antenna booster that comes stock on these systems. That one threw me a bit when I gutted everything.
 
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