I have a toyota avensis from year 2000, the dash board lights and the back lights dont work, probably the fuse is burned, so i have to change it. I have searched the fuse which serves for these lights is located somewhere on dashboard, my question is where is the fuse exacly located ? if it is behind the cover of the dashboard how can i open it?

check for bad grnd connection also the fuse may look good but still could be bad meter it out to be sure if still blows fuse you have a short in that line

When this started happening your first thing to do is to check ALL ground connections. You will find possibly 2 under the dash. A white wire connected to a wire end with an eye and a bolt holding it to the firewall. Should be one on each side. Always check the grounds FIRST above all else. Make sure they are clean and tight. New shop mechanics will not check this, they just keep charging more and more, checking EVERYTHING else BUT the ground connections. I'm old school and do things right, the first time. Everything else being good, the power is feeding back through the fuse and causing a spike and blowing the fuse. If all grounds are good after your done cleaning and tightening and tried it out for a while, you may have to go as far as pulling the signalstat unit from the columb and checking that connection last. Only happening in hot weather may just be a happenstance. That would make no difference. Unless of course when it happens, the AC is on and pulling power when you use the signals. Use the signals when AC on and if pops the fuse, it's the ground connection at the AC unit. Have fun under the dash.

check your fuses

Check the obvious, the drive belt, if thats ok, start engine and turn on headlamps, rev engine and see if the lights brighten,if not, the quick diagnosis would point to the generator, Regards Mike

THERE SHOULD BE A FUSE BOX OR COMPARTMENT WITH A LIST OF FUSES ON THE COVER.. LOOK UNDER THE DASH OR CLOSE TO THE WIND SHIELD UNDER THE HOOD.

You probably only have a blown fuse, in your fuse box, look for the fuse maked (tail light). this should take care of you problem...

Probably a burned wire inside the dash of the car. You can check if you have a fusible inside the hood near the battery.

The parking and tail lights are usually on the same fuse as the dash lights so if the outside lights are working it sounds like the instrument dimmer control has failed. The electronic bits inside the control for these lights sometimes go faulty. A temporary fix is to remove the wiring plug that attaches to the back of the dimmer control and put a jumper wire across the terminals. If dash lights then work then replace dimmer control.

if your dash lights don't work, it could be a fuse in the fuse panel located under the driverside dash board. be aware that if it is the fuse, you also wont have any tail lights either when you turn your lights on. Just brake lights.