How can I get interior lights on, all the sockets are working yet the lights don't work.

Could be the interior lamp relay , stuck contacts inside the relay ! Located in the I/P fuse panel .

Is the interior light switch turned all the way off? As for the signals check for 12V at the bulb. If its there you have a bad bulb, poor connection, bad socket, or poor/open ground. If no voltage at the bulb you have an open circuit or bad signal switch, you need to do more troubleshooting of the circuit to find the problem.

check the fuses in the fuse panel. make sure the interior light isn`t burnt out and needs replacing. also some light switches(for the headlight) have a switch built within it that if its turned too far one way it will shut of the interior light function. if this not the problem then check for power and ground at the interior light socket as there could be damaged wire. if the fuses are good and the power windows don`t work then you will have to check the window switch for power and grounds as the other windows are feed through the drivers switch. if you have power and grounds then you may need to replace the switch. if you have no power or grounds then you will have to check for a broken wire were the wires go from the door to the body of the car as they have a problem with breaking. there is also a power window relay in the relay box.

seems you have several different problems. High beam working and no low beams=dimmer switch is bad. Reverse lamp not working=bulb socket bad,wiring broke,bad ground at back
Brake light on drivers side stuck on=brake light switch

on gms the brakes are hot always to fuse from it to brake switch from it to turn/hazard switch if both brake and turn dont work replace turn signal switch and it is hard to do ,remove bottom steering cover then top cover you need special inverted touqix socket to remove top and regular touqix bit for bottom lower cover must be removed two screws hold switch on one on top other turn wheel and you will see at bottom on front of switch . follow wires to big plug under dash loosen bolt in center pull plug apart section for turn switch slides in remove then replace on column wires may be hooked fight loose and pull up through along top and out with wires push new down down same spot and replace every thing takes me about 1 to 1/2 hours to do some times less.

I have a 2003 Buick lesabre limited my inside lights don't work

these trucks have a generic body control module in the left kickpanel. just remove the plastic trim from the drivers floor molding to access the module. inspect the wire for green dust or gel. if there is signs of this then you have a corrosion problem. disconnect you battery and then try cleaning the corrosion all off using contact cleaner and penetrating oil. once the corrosion is gone then reconnect everything and try to see if it works. If not then it is possible that the module is damaged. you will need a new one.

Have had this problem many time's here at my shop, if center brake light come's on which you said it does, fuse and relay are good, the problem is your turn signal switch cause the brake light circuit goes through the switch, the switch is bad even though the turn signal's still work's, good luck, hope this was evrey helpful.

trace to switch (can't remember name, but it has to do with the timing of lights) and clean contactpoints. if not replace switch>