As I recall, there is something in the owners manual about (humming) noises when the car is shut off and that it is normal. It's the fuel system purging itself periodically.
And as mentioned, the HID's make a humming sound too.
Yep, that's what it is. My GS does it and my mothers X3 does it as well, its normal there was a discussion in the 3GS forum thread on this. I'll see if I can find it.
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2014 Lexus GS 350 F-Sport/Heated Steering/Blind Spot Monitor/Rear Traffic/30%Tint/Vinyl Wrap/Philips U 6K/J5 Coilovers/Rays GramLight 57FXX Wheels/Meisterschaft Exhaust/Invidia Mid Pipe/Lexon Front and Side Skirt/More To Come
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