Bypass amplifier help
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Driver School Candidate
Joined: May 2008
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From: NY
Bypass amplifier help
Does anyone know how to bypass a 1998 Lexus ES300 amplifier? I installed a new multimedia system. When the key is turn on ON (not ignited) the system sounds good. However, when I turn the key on the Ignition, there is a static/ high pitch noise. I was told that I need to bypass the Lexus amplifier otherwise, it will be a matter of time before I burn it.
yeah, you need to run speaker wires from your new radio to the speaker cables off of the amp.
What you want to do is cut just the speaker wires fromt he amp harness and connect them directly to your radio's speaker wires. Plug the harness back in to the stock amp, leaving the other wires intact and still functioning as is.
I have a 94 ES300 so I'm not sure if the amp harness is the same harness as yours but here's what mine look like.
This pic is from the courtesy of 92Lex and is what I used to by pass the amp.
What you want to do is cut just the speaker wires fromt he amp harness and connect them directly to your radio's speaker wires. Plug the harness back in to the stock amp, leaving the other wires intact and still functioning as is.
I have a 94 ES300 so I'm not sure if the amp harness is the same harness as yours but here's what mine look like.
This pic is from the courtesy of 92Lex and is what I used to by pass the amp.
Thread Starter
Driver School Candidate
Joined: May 2008
Posts: 4
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From: NY
Still need help with bypassing the stock amplifier
There are three plugins in the lexus/toyota amplifier. Anyone know which wires I can cut and bypass them? Or maybe there is an easier way to take care of this. What are my other options?
Snap some pictures and the folks here might be able to help you out.
Your other option is to buy a 4 way amp and then run new speaker cables to the factory speakers or replace them with new speakers. If you do this then you might want to consider buying a XOVER.
The configuration for the XOVER would be remote turn on wire and RCA/Audio cables to XOVER, from XOVER RCA cables to Amp and then Amp speaker wires to each individual speaker. Its alot of work if your new to hooking up a stereo system but its well worth it.
Your other option is to buy a 4 way amp and then run new speaker cables to the factory speakers or replace them with new speakers. If you do this then you might want to consider buying a XOVER.
The configuration for the XOVER would be remote turn on wire and RCA/Audio cables to XOVER, from XOVER RCA cables to Amp and then Amp speaker wires to each individual speaker. Its alot of work if your new to hooking up a stereo system but its well worth it.
Thread Starter
Driver School Candidate
Joined: May 2008
Posts: 4
Likes: 0
From: NY
This is the stock amplifier that I am trying to bypass. The multimedia system I have just installed has its own amplifier, so now I hear this annoying high pitch static. What should I do?
I'll see if I can download the Service Manual for your gen and check out the wiring diagram.
In the meantime, it would make my life easier if someone else who already did this chimed in.
Your getting the exact same RF noise that I had before I by passed the amp.
The only issue I'm having right now is that I'm getting a popping noise when I turn off the radio. i'm assuming its a faulty connection.
In the meantime, it would make my life easier if someone else who already did this chimed in.
Your getting the exact same RF noise that I had before I by passed the amp.
The only issue I'm having right now is that I'm getting a popping noise when I turn off the radio. i'm assuming its a faulty connection.
Last edited by kphu; May 28, 2008 at 06:17 AM.
ok so according to the wiring diagram for the 3rd gen ES300. Here's the speaker wires.
Cut just the wires in the diagram (i.e. don't cut the non-speaker wires as some of them are ground and power cables that connects to relays, etc) and plug the harness back into the amp (very important that you plug the harness back into the amp). If you accidentally cut the wrong wire reconnect them either with a soldering gun or butt connector. If you use a soldering gun I'm sure you know to tape them up with electrical tape or use plastic shrink tubes.
Connect the wires that are detached from the harness accordingly to your speaker wires from your head unit i.e. Right rear cables to right rear speaker cables from head unit, etc.
Cut just the wires in the diagram (i.e. don't cut the non-speaker wires as some of them are ground and power cables that connects to relays, etc) and plug the harness back into the amp (very important that you plug the harness back into the amp). If you accidentally cut the wrong wire reconnect them either with a soldering gun or butt connector. If you use a soldering gun I'm sure you know to tape them up with electrical tape or use plastic shrink tubes.
Connect the wires that are detached from the harness accordingly to your speaker wires from your head unit i.e. Right rear cables to right rear speaker cables from head unit, etc.
Last edited by kphu; May 28, 2008 at 07:06 AM.
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Driver School Candidate
Joined: Dec 2008
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From: CO
'93 ES300 need to do this
yeah, you need to run speaker wires from your new radio to the speaker cables off of the amp.
What you want to do is cut just the speaker wires fromt he amp harness and connect them directly to your radio's speaker wires. Plug the harness back in to the stock amp, leaving the other wires intact and still functioning as is.
I have a 94 ES300 so I'm not sure if the amp harness is the same harness as yours but here's what mine look like.
This pic is from the courtesy of 92Lex and is what I used to by pass the amp.
What you want to do is cut just the speaker wires fromt he amp harness and connect them directly to your radio's speaker wires. Plug the harness back in to the stock amp, leaving the other wires intact and still functioning as is.
I have a 94 ES300 so I'm not sure if the amp harness is the same harness as yours but here's what mine look like.
This pic is from the courtesy of 92Lex and is what I used to by pass the amp.
HOW????
I had planned on bypassing the factory amp altogether, and running wires from my headunit to the speakers. But I don't want to run tons of wires.
How did you do it?
Did you leave your amp in there and only snip those wires? I need a lil help, can you explain more step by step how you did it?
MANY THANKS!!
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Hey i am actually getting the Avic D3 soon for my car. So where does the power come from? Also where is the VSS wire in the 2000 ES300? Is there anyways to bypass without cutting wires? THANKS!!
I need to bypass my factory amp on a '93 ES300. I see you've already done this on a '94
HOW????
I had planned on bypassing the factory amp altogether, and running wires from my headunit to the speakers. But I don't want to run tons of wires.
How did you do it?
Did you leave your amp in there and only snip those wires? I need a lil help, can you explain more step by step how you did it?
MANY THANKS!!
HOW????
I had planned on bypassing the factory amp altogether, and running wires from my headunit to the speakers. But I don't want to run tons of wires.
How did you do it?
Did you leave your amp in there and only snip those wires? I need a lil help, can you explain more step by step how you did it?
MANY THANKS!!
https://www.clublexus.com/forums/es3...al-tips-5.html
Good Luck!
Driver School Candidate
Joined: Dec 2008
Posts: 14
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From: CO
Run speaker wires or use harness
Thanks for pointing me to the DIY!!!!
I have one last question:
http://bicostereo.com/index.php?act=...;productId=787
Metra 70-8119
Looks like this harness is a amplifier bypass for our car, attach it to the amplifier, find a way to run it up to the back of the headunit without looking awful, and then solder/crimp the wires and be good to go.
Looks a little pricey, but looks like it would work.
I could save $$ by following your instructions and running the wires myself, but my question is--the harness shows more than just speaker wire running. It shows two connectors on it.
Does running speaker wires alone work? Why does this harness do more than that?
Thanks!!!!!!!
I have one last question:
http://bicostereo.com/index.php?act=...;productId=787
Metra 70-8119
Looks like this harness is a amplifier bypass for our car, attach it to the amplifier, find a way to run it up to the back of the headunit without looking awful, and then solder/crimp the wires and be good to go.
Looks a little pricey, but looks like it would work.
I could save $$ by following your instructions and running the wires myself, but my question is--the harness shows more than just speaker wire running. It shows two connectors on it.
Does running speaker wires alone work? Why does this harness do more than that?
Thanks!!!!!!!
Driver School Candidate
Joined: Dec 2008
Posts: 14
Likes: 0
From: CO
http://bicostereo.com/index.php?act=...;productId=787
Metra 70-8119
Looks like this harness is a amplifier bypass for our car, attach it to the amplifier, find a way to run it up to the back of the headunit without looking awful, and then solder/crimp the wires and be good to go.
Looks a little pricey, but looks like it would work.
I could save $$ by following your instructions and running the wires myself, but my question is--the harness shows more than just speaker wire running. It shows two connectors on it.
Does running speaker wires alone work? Why does this harness do more than that?
Thanks!!!!!!!
Well if anyone's got any advice...
I used the metra amplifier bypass--wired up great. But with it my door speakers and tweeters won't work. (They're all stock). Rear speakers and dash speakers work great.
Without bypass the stock amp and using it, (wiring via the RCA cables), I get loud feedback. I can run an inline ground loop isolator (noise filter) and get rid of most of it, but still an annoying whine remains.
Lesser of two evils....
Well if anyone's got any advice...
I used the metra amplifier bypass--wired up great. But with it my door speakers and tweeters won't work. (They're all stock). Rear speakers and dash speakers work great.
Without bypass the stock amp and using it, (wiring via the RCA cables), I get loud feedback. I can run an inline ground loop isolator (noise filter) and get rid of most of it, but still an annoying whine remains.
Lesser of two evils....
I used the metra amplifier bypass--wired up great. But with it my door speakers and tweeters won't work. (They're all stock). Rear speakers and dash speakers work great.
Without bypass the stock amp and using it, (wiring via the RCA cables), I get loud feedback. I can run an inline ground loop isolator (noise filter) and get rid of most of it, but still an annoying whine remains.
Lesser of two evils....
Use the DIY thread to identify which wires are the speaker wires. Hook up your speaker wires accordingly.
Remember that most headunits only have 4 pairs of speaker wires 2 front and 2 rears because of that you'll either need to combine some for tweeters and subs or put a crossover to split the wires.
Last edited by kphu; Jan 5, 2009 at 06:52 AM.
