Pioneer deh-4000ub no sound

[Horse_1]

Hi I got fucking pioneer see title

It powers on. Both cars and all work but no sound

Tested on two cars and OTGER STERIO LIKE PANASONIC WORKS ON BOtH CARS

So what the fuck is this shit

 

[Horse_1]

I dont have muted

It must be stupid settings of stereo pioneer but I tried all and I need factory reset it but there's no button fucking shit