I have a 1992 300SE, When I point the infared key at a door or the trunk, I get the proper light notification but the doors don't unlock or lock. The button on the drivers side door dosen't operate either. The trunk closure mechnism isn't functioning. I looked in the trunk fuse box and in the engine compartment fuse box to see if a fuse was blown, everything looked ok. This problem started all at once. Is there something else I need to check?