Subwoofer control problems?

[Knight515]

since my battery started going bad and my stereo restarted, i am no longer able to control the lever of my subs from my stereo, what is the cause and how can i get it back to where i can control them again from my stereo?

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[maylar 10+ year member]

Check that the settings in the HU haven't been reset.

 

[Knight515]

how do i do that?

 

[goingdef 10+ year member]

how would we know you haven't said what HU?