99 gran marquis electrical problem

my 99 mgm has developed an electrical problem. it lost power to door locks including key less entry on the door, power mirriors. interior lights, and the auto climate control. i found a blown 15 amp fuse that suplies the lighting control module replaced it and it blew again. i made a test light pluged it in where the fuse goes and the light shows a dead short. removed the auto climate control... and the light stays on still a short some where.... now with the test light in the fuse spot. with the door open the test light stays lit.... when i close the door the test light dims and i buzzing noize starts out soft and starts to get louder as the test light dims..... the buzzing noise seems to be coming from a control with a couple large cables pluged into it,,,,,, could this be the lighting control moduel.

need some help here please AL.