AXXESS Metra TYTO-01 JBL Amplifier Interface Harness, BLACK

I was pulling my hair out trying to replace the factory head unit in my 2003 Toyota 4Runner that came with the factory JBL audio system (amp and sub in trunk). I was minutes away from just driving my truck off a cliff out of frustration with how many different poorly documented factory wiring options there were for one freaking make/model of car. This was my 4th wiring harness I purchased and the only one that worked. It works perfect. Please note however the product does not match the picture in the description. There are no RCA cables at all, and the black box is a different shape see the attached picture. However, it seems to work fine by hooking up the eight wire leads instead of four RCA's.I will explain what was wrong with the other three harnesses, as I figure people with the same vehicle as me may be running into the same issues and this is the answer.1st attempt - Metra 70-1761 - This is the standard Toyota 87+ wire harness, however if you have a JBL factory headunit these wires will not fit. This is for non JBL headunits, that only have 4 door speakers. I had to remove 6 panels and take my dash half apart to get to see these factory wires.2nd attempt - Metra 70-8113 - Fit one of the three factory JBL harnesses, and the new head unit powered on, however no sound. Found out part of my factory JBL system was an amp in the trunk that powers 10 speakers. This harness didn't provide the necessary data signal to the amp to turn it on, so there was no sound. The blue "amp on" wire did not work.3rd attempt - Metra 70-8117 Amp Bypass Harness - Decided the bypass the amp and center/tweeters all together and just hook up the 4 door speakers with this bypass harness. It did not fit the factory harnesses, and with some extensive googling for wiring guides i found out the specific model factory headunit i had (JBL 56827) has three plugs on it, however none of these 40 some wires work for bypassing. They are all for audio-in expansions and steering control and other stuff. This is about where I lost it.4th attempt - This - It doesn't look at all like the picture. There are no RCA connections as pictured, and the black box is completely different. My new headunit had RCA connections which made me think this was not going to work. I figured it was worth a shot though so I wired it up to the 8 F/R L/R speaker leads. IT WORKED! It was sounding a bit distorted so I tweaked the attenuator knob and now it sounds incredible and clear. There is about a 5 sec delay from turning my truck on and off till you hear any sound, however it seems to work consistently. There is no steering volume/track control for a JBL 56827, those wires are on a different harness slot that wasn't part of this package.This is the most expensive solution of the four I tried, but it is the only one that actually worked, and the results sound great and functions perfectly. I lost steering wheel volume control, but it sounds like for another $50 you can get a universal steering wheel control adapter. However I'm pretty much over this project, and I'm fine with turning the volume knob by hand. It is so much better having a modern headunit in place of the crappy JBL factory unit, the audio sounds much cleaner and more full despite not doing anything to the factory speakers yet.

I have an 05 Toyota Sequoia with the JBL system. I wanted to keep my factory system that has an amp but put in an aftermarket head unit. This worked great. A wire pulled out of one of the harnesses but Amazon sent me a replacement the next day. Works great and very easy install.There are only 4 RCA plugs to plug into the back of your aftermarket head unit and then you just connect the power, ground, amp (accessory), and constant power. The harness plug from this harness plugs directly into your factory harness. This makes putting in an aftermarket radio easy.Also, keep in mind that there is a 'volume' knob on this harness interface. I turned mine up about 90% and the volume is great and I can't imagine needing any more. Some reviewers complained of a lower volume, and this could be the reason...they might need to adjust it. You just adjust it with a phillips head screw driver.Also, some complained that they had lower quality. My system sounds MUCH MUCH better than the factory head unit. The bass sounds better and overall sound is better. I actually decided against putting my JL Audio components in b/c the factory JBL system sounds great.This should work on your Sequoias, 4Runners and other Toyota cars with JBL systems. I think it will also work with Lexus.The following does NOT involve the harness above, just a side note: Note for Sequoia owners: If you have the 'blown' or 'farting' front speakers in your JBL system it is an easy fix....all you need is some tacky glue, pull the speakers out and glue around the surrounds....I did it to both of mine and they sound brand new. There are also kits you can buy so you don't have to replace the front speakers. That is a known problem with the Sequoia front speakers and again this is NOT A RESULT OF THE METRA HARNESS.

I needed to upgrade my radio (6-disc cd changer) from a Mark Levingston system in a 2002 Lexus ES300. Apparently it needed this setup in order to use the factory amp and I didnt know if it was possible to bypass the amp and simply use the power of the new radio. The old radio was PERFECT, but I MUST HAVE BLUETOOTH and had to change it out. After tons of reseaching, I decided to bite the bullet and order this, hoping to avoid all the issues other have had. I was tempted to order plain cables that supposedly work and try to bypass the factory amp, but Im glad I didnt. This works perfectly fine and was relatively straight forward. Sound is great and I have my bluetooth. Shameful that I had to remove a really nice factory radio, but oh well. Five starts because it works and I know others had major issues going other routes: Fortunately for me and this setup, I didnt have any issues.******By the way, I had to order a new dash ($25 Metra) to accomodate the double-din radio. Fit was just OK and not as refined as I had hoped, but that is Metras fault and has NOTHING to do with this cable

The first one didn't work. I didn't know this right away as the unit powered on but there was no sound. After trying many on-line solutions with no results, I tested the speaker output of the head unit on a speaker directly and it worked fine. The line converter or something wasn't working. Exchanged it for a new one and voila, worked immediately.It was an easy exchange, but the faulty unit knocked it down a star. The wiring instructions are a breeze and easy to follow.I replaced the non-navigation head unit on my 04 Lexus GX470.