Homelink buttons not lighted like other car makers.

I've had several makes of car with the Homelink buttons; and those car's buttons were illuminated at night. My Cadenza isn't; though the Homelink setup and mirror look identical to most others used by Toyota, Honda, etc.

My dealer has no idea why or if it can be wired to light; at night it's impossible to get the right button without turning on the courtesy overhead light, so, I just put a small piece of velcro on it to use by feel.

Any electrical gurus have any ideas if this could be added somehow? ( My Lexus GS400 had this and it was great; mirror looked identical to my Cadenza's).

thanks!