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I have an 08 IS350 and this morning I noticed for the first time that there is a tiny LED light that was "on" and I couldn't turn it off. It is located in the the overhead console between the door light on and off switches.
It's for "ambient lighting" of the console area, it does not turn off. Since those small LED's have something ridiculous like a 100,000 hour life, I would not worry about it.