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Old 01-19-12, 11:44 PM   #61
step2me
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I have a 2000 gs400 with factory navi ....i want to keep the head unit and change all 4 door speakers and add a box and a 5 channel amp to push the system ..how do i do this ? helppppppp please
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Old 03-22-12, 07:33 AM   #62
EngnPushr
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very helpful! Thank you
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Old 03-30-12, 06:16 PM   #63
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Quote:
Originally Posted by offandongu View Post
Hey guys, I saw on here that a lot people seemed to have questions about the GS300 after market radio installation. So I just put a radio in my wife's car and thought I'd take some pictures during the install that might help you guys out. I was an Assistant Car Stereo sales and installation manager at Circuit City for 3 years so I have a lot of experience doing installs. So here we go:

I started by making a harness that was about 36 inches long to reach from behind the radio to the factory amplifier:

I left a quick disconnect harness on, like the ones at circuit city, incase I change out the radio later, this way I won't have to wire anything else up.

Next I dropped the glove box and located the factory amp and the output wires from the factory amp (an met 80 or 70 1761 from BB or CC will fit this harness).


Here's a close up of the harness and where it was unplugged from:


Factory Amp location on right:


Next I got 12 volt switched (accesory) from the harness behind the factory radio (not the factory amp) it is a gray wire:


Now I decided I wanted to try and keep the factory sub-woofer. To do this I wired in the sub-woofer wires (green w/red & green w/black on the small harness coming off the factory amp) to the driver's side rear speaker. The downside to this is that the factory sub and rear driver's side speaker are lowered to 2 ohms. It did not sound like any highs were getting through but it is difficult to tell since I can't fade the driver's rear off or it gets no signal. Here is a picture of the wires off the factory harness with the wires jumped from the driver's side rear speaker spliced and soldered on:


Next I grounded the radio to the gold colored bracket to the right of the glove box:


Here's a close up:


Last, I ran the wires along the same path as the factor wires and zip tied them in place:


And that was it. I soldered everything and I would recommend that you do the same. Time will tell if leaving the factory sub hooked up is a bad idea or not, but it definitely needed some bass when disconnected from the factory amp.
Justin

after we ran the wires to the 2 harness in the glove compartment, do we plug those 2 plugs back in or leave them unplugged? I have external sub, if this helps
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Old 06-30-12, 11:26 PM   #64
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Just a informative note on the sub. I just did it today temporally just for the hell of it. Connect the positive subwoofer wire to the + rearl left speaker output from your new radio and the - to the - rear right output. I won't say that it is in anyway good for the radio but I have a 150x4 jl amp and if the radio amp fried it wouldn't have really mattered. But it didn't. And it sounds great. I doesn't make your rear right or left speaker louder than the others. In response to the way you said to wire in the sub!! I you have your factory speakers installed also. I'm 95% positive (will check tis also tomorrow) that factory speakers are not 4 ohms they are 2 and wiring them in parallel like you did by adding another speaker to 1 output made them 1 ohm. I worked for circuit city as a installer for four years also. FYI. It's not safe to wire a 5th speaker. Especially a 10" one to a factory radio any way you do it. But if you want to don't simply attach it to one speaker output. You should know better. Maybe that's why they went out of business.
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Old 07-10-12, 12:32 PM   #65
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If you want to completely replace everything. HU, speakers, amp, sub. You run your speaker wire from new multi-ch. amp directly to speakers in doors, then sub powered of another amp. Would you even need an aftermarket wire harness as it seems none are plug and play? I would just have to hardwire the power ACC and Ground? Right or wrong?
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Old 03-21-14, 08:22 PM   #66
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Hey i did as you did to hook up a aftermarket radio but now my dash lights are not work . So what can that be ? Thanks
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Old 07-21-14, 05:00 PM   #67
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how did u get the 12volts constant the yellow wire , and the factory amp still wok with the after market radio , if you do how you turn it on r connect the factory amp . i want to put a double din in my friend lexus gs300
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Old 02-07-16, 01:23 AM   #68
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I know this is an old thread but I also want to know how you got 12 volts constant to the yellow wire. You mention the gray wire for accessory and grounded it behind the glove box but did not mention the constant wire. It's been a long time since I replaced a Head unit so if I remember correctly all you need is the yellow, red, and ground to power it on. And your running the speaker wires from the after market head unit plug to a Toyota wiring harness and connecting it to the plugs the come off the factory amp. Is this correct? And is the speaker part of the set up plug and play with the harness coming from the amp or do I have to move wires around. And the meta kit comes with a 2 piece harness, do I only use the square one for the speakers and discard the rectangular one? I'm only trying to install a new head unit with the stock speakers and don't mind bypassing the stock amp. If anybody can answer this I would appreciate it. Thanks
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Old 03-14-16, 12:25 AM   #69
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Did you guys figure where to get the constant 12v yet? From what I researched its a blue/yellow wire behind the radio, possible near the switched gray wire if not need to look near the factory amp for the wire color.

http://www.the12volt.com/installbay/....asp?tid=77179

I'm also getting ready to put in my stereo and had a question about the antenna. There is a two antenna outputs on the factory radio, so I believe I would use only one of them to plug into the aftermarket radio? Also I think the antenna is also amplified, which wire do I tap the power antenna wire from the aftermarket radio to?

Thanks!
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