Hey guys, awhile back I followed a write up to replace some burned out bulbs behind the hvac controls and it worked great. Now I'm starting to wonder if I have another bulb out, but I'm not sure. It's the button that raises and lowers the rear window. On mine, the little picture in the middle of the button glows, but the carrots that point up and down do not. It seems like they should because at night I have to guess which side to push. Can anyone tell me if they're supposed to be lit? If so, how to get to it? Thanks in advance.