Pin diagram of the factory radio for the amp turn on wire, needed

Tiny
LINDA BULLOCK
  • MEMBER
  • 2004 LEXUS LS 430
  • AUTOMATIC
  • 75,000 MILES
I am trying to find pin diagram of the factory radio to locate the amp turn on wire location. Also, I need steering wheel control locations. Not a Mark Levinson system.
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Monday, June 27th, 2022 AT 9:12 PM

9 Replies

Tiny
STEVE W.
  • EXPERT
I'm sorry to tell you that installing an aftermarket stereo in those is very difficult as the system doesn't use common parts. The controls use a special signal bus between all of the components to turn them on, adjust the outputs and more. As far as I know there are no adapters made to interface with that system. The only way to really replace the factory system is to remove the OEM and wire in everything on it's own. You will lose the steering wheel controls, the factory amp and if it has the rear controls those will stop working as well. Just the way Lexus built that system makes it very difficult.
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Tuesday, June 28th, 2022 AT 3:10 AM
Tiny
LINDA BULLOCK
  • MEMBER
Can you tell me the pin location on the factory harness for the amp turn on wire?
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Tuesday, June 28th, 2022 AT 9:49 AM
Tiny
KASEKENNY
  • EXPERT
Just to jump in on this. I am attaching the entire wiring diagram below of the non Levinson system. We do not have actual connector views of the wires but the connector numbers, pin location and colors part of the diagram.

Let us know if you need more info. Thanks
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Tuesday, June 28th, 2022 AT 10:44 AM
Tiny
STEVE W.
  • EXPERT
There is no amp turn on wire, that is the problem. It doesn't use a common wire where a 12-volt signal turns it on and removing it turns it off. Instead, it uses a computer signal that turns the power on, and another that turns it off, along with other signals to set the balance and other settings, all on a two-wire network that nobody makes an interface for. Even the base stereo uses those command signals between the units and not a simple on off control like most cars use. That is why Crutchfield even warns not to replace the stock stereo.
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Tuesday, June 28th, 2022 AT 11:01 AM
Tiny
LINDA BULLOCK
  • MEMBER
Thank you Kenny K, that is what I was needing.
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Tuesday, June 28th, 2022 AT 3:53 PM
Tiny
LINDA BULLOCK
  • MEMBER
So, we ended up bypassing the factory amp and wiring directly. Now I am getting very poor reception with the aftermarket unit. Any ideas?
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Friday, July 15th, 2022 AT 2:32 PM
Tiny
STEVE W.
  • EXPERT
That car also has an active antenna that uses a signal amplifier that is also controlled the same way as the audio amp you bypassed. The amplifier uses the antenna on the rear window and without the amp it will barely work. It's why the common work around is to add a new antenna.
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Friday, July 15th, 2022 AT 8:58 PM
Tiny
LINDA BULLOCK
  • MEMBER
Thank you added another antenna and it works great.
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Saturday, July 16th, 2022 AT 11:57 AM
Tiny
STEVE W.
  • EXPERT
Good to hear.
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Saturday, July 16th, 2022 AT 2:39 PM

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