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I don't have memory seats, but my trunk and gas buttons are not illuminated. Lexus got it wrong on this one... it will take a while to memorize the location of the buttons at night when you're filling up or trying to open the trunk.
maybe to minimize the number of lighted buttons to avoid confusion at night. These buttons are seldom used while the car is in motion (actually can't and shuoldn't be used while in motion) and are used only when parked or when the door is opened (thus the interior light on). The rear seat window switches are not lighted, either. I'm sure Lexus didn't overlook the buttons or try to cut cost, after all, they spent money on "useless" LED accent lights.
Mine don't light up either. Looks like we have to operate by feel when it's dark outside.
The interior lights that come on when you open a door should be more than bright enough to see those buttons. If the interior lights DON'T come on when you open a door at night, toggle the left on/off button on your overhead center light. My car came with that switched in the off position, which initially led me to wonder if Lexus thought that the starter button was sufficient nighttime illumination. =)