Hi, i got this problem in mazda 3 (2007) that when i push this button to change bass treble etc. it doesn't work. Nothing shows up, nothing changes. I dont know if replacing/fixing this button will help or there is easier solution. It's not something i can not live without but will make life better if i could change some values to make music better.

(Cant upload the photo, its this round button on left side (Push audio CONT)

 

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Shop for a replacement EQ
You may be able to find a used one in an auto recycler or places like E-bay?