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With premium sound system you have to bypass the factory amplifier and pretty much splice into the factory wires after the amplifier.

A good place for questions is the www.clublexus.com forums or the www.lexusownersclub.com forums.

Search the forums and your question has already been addressed.

Myself i have a 1999 gs400.

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Q: How do you wire and after market radio to a 1998 Lexus GS 300?
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