Loude problem Espace 4

I own espace 4 1.9dci 2004 , I have a problem and ask for help.

Radio volume will increase by the end of himself .

1 took out the batteries from the remote control
3 remove the wire from the remote on the wheel
4 replaced the radio unit in the trunk
5 has nothing to do with RPM
6 disabling speed on the radio

Please for proposal or solution

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Loude problem Espace 4