Anything directly connected to the electrical system that is added on aftermarket will void the warranty (the electrical sytem warranty at least and most likely the hybrid battery system since it is intimately associated with the electrical system)
This information comes directly from the hybrid tech support.
What you said is partially true. According to the Magnuson-Moss Warranty Act a manufacturer may not void a warranty unless they can prove the aftermarket part caused the problem. Please see http://www.granatellimotorsports.com/magnusonmoss.htm for a brief description.
So, if anything has been added and Lexus determines it caused damage to the vehicle you have no warranty no matter who added it.
Best advice, try to get a warranty from whoever sells you the aftermarket part especially if it is connected to the electrical system. I believe the hybrid/electrical system is warrantied for 8 years.
This is absolutely incorrect and illegal from some act that I can't remember from a few years ago.
The warranty can only be voided for something directly affected by the aftermarket part. So if you install new wheels, it doesn't void your paint warranty or interior warranty, but it could void your brakes and bearing warranties.
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