Front speaker not working (08-Corolla CE)

If the speaker or headunit is after market - I would start there. Remove the aftermarket part and look to see if the wire is still attached. If so, grab some spare wire. Attach the speaker to its designated wire from the head unit. If it works, there is a problem with the wiring between the unit and speaker. If the speaker still does not work, attach it to a different set of wires from the unit that power a working speaker. If this does not work, you know the speaker is broken

It's original speaker and nothing new has been installed. Sorry if it's stupid question but Would the wiring be located in the trunk?

I am assuming this is a rear speaker. Each speaker needs two wires to power it (positive and negative). These wires are attached to metal connections or terminals. Your goal is to attach the working speaker wires (positive and negative) to the non working speaker wires. You can attach via terminals instead as long as the wires are connected to the terminals. Most cars you are able to see the back side of the speaker from inside the truck. Back side is where you will find the wires/terminals. If this is the case, the easiest way is to attach spare wires from the working speaker wire to the non working speaker wire. If you do this, and you speaker does not work, then it needs to be replaced. By attach, they only need to be touching; if a friend can hold one side while you hold the other, that is good enough. If you do not have a spare wire, you can unplug both speakers and attach the working speaker wires to the non working speaker. The wire is most likely not long enough to reach the non working speaker, so you might need to remove it first before you are able to attach it. If your speaker now works, you know you most likely have a wiring problem. Cheapest way to fix this is to connect a wire from the working speaker to the non- working speaker. While your speakers will be receiving less power, they both will work.

It's not a stupid question. You have to ask to learn. But do you know how to set the 'fade'?

Yes I do. It's currently set to 0. What should be ideal value?

Well I played with fade a bit and it seems like all 4 speakers are working. However I feel rear speakers are more powerful than front one. Is it normal? All three bass/trebles fade is at 0 now

Yes, '0' is middle of front/back fade, Same as "0" is equal left/right It goes up to 7, a 7 is total of the front/ rear, or balance for left/right side. But it's not bass/treble. Those are separate controls. For example if you put the fade on 3 I forget witch way it goes, it will get louder in front or rear. It has 6 speakers

UPDATE: The problem people are having with the front speakers going out is this. * The cheap factory speakers suffer from a problem between the wiring terminal (where the wire harness connects and the actual speaker cone. It appears over time corrosion or something micro breaks the tiny wire at the plastic bridge, designed to hold the wire as a strain relief. Soldering the wire is hugely impossible because there isn't any real access to adding a wire "jumper" SOLUTION: Purchased a pair of 5 inch round speakers new from Walmart. $25 for the PAIR!! 4-14- 2020 in the Auto Dept. Drilled out the old riveted speakers, and cut out the old magnets and used the frames as adapters. Conclusion: Yes, it's a bunch of work to replace the speakers however there are SEVERAL YouTUbe videos on it. Took about 5 hours start to finish. Needed a drill, several drill bits, some wire, soldering wire, some silicone and some metal screws. Having some shrink tubing is advised too. Using the existing wire within the car was fine, it's heavy duty. Tied into the wire pair heading to the original speaker. In the Toyota's, speakers go through a tweeter first, then to the door speaker. Everything worked fantastic and now I am happy!! Eric