What model of Corolla ? You have to take the dash board out and the bulbs can be removed and replaced from the back. The dashboard on the Corolla is not that difficult to take out, but you have to do it slowly and carefully.
Right behind dash board
The bulbs are actually soldered into the circuit board. The only way to change them is to dismantle the whole cluster and desolder then re-solder the bulbs.
I just did this to my radio. You must remove the radio for the dash. Open the radio to reveal the circuit board and solder new bulbs on the board. I found the bulbs at Radio shack online.
To change the dash light bulbs you must remove the instrument panel.
Start with fuses then bulbs then wiring.
easy
You have to take the whole front console off including all the plastic moldings, and finally get to the dash board. You can find the lights bulbs behind it. It took me 3+ hours to get this done. good luck.
to change the lights you remove the dash cluster and replace the bulbs. the number for the bulbs are 197
It is practically impossible to reach up behind the dash to change the bulbs. Remove the trim around the instrument panal and you should be able to pull it out enough to change the bulbs. You may have to disconnect the speedometer to get it out far enough.
Assuming the bulbs are good, the dash illumination light brightness control switch is turned off or broken.
remove all bots that hold on dash look around everywhere even under the dash by your pedals drop the bottom part of dash off there should be 2 more bolts holding the top part of dash on remove dash and wiring from behind dash pull dash out of car remove your instament panel change bulbs remove all bots that hold on dash look around everywhere even under the dash by your pedals drop the bottom part of dash off there should be 2 more bolts holding the top part of dash on remove dash and wiring from behind dash pull dash out of car remove your instament panel change bulbs