'00 rear defrost/ECT backlight

I'm assuming the rear defrost and ECT buttons on the '00 4runner are supposed to be backlit, but currently mine are not (just got the vehicle last month). Any suggestions/tips on how to fix this problem? I'm also having this same problem with the fan control backlight, however it will come on if I tap the panel or turn the fan on and then off.

Thanks in advance....