1995 Honda Civic Press Brake pedal and front side lights co

Hi, when my cars lights are turned OFF, and I press my brakes the front lights (side lights) come on too.

And the stereo and the clock and dails all go dim until I release the brake pedal

When I turn ON my front lights all the interior lights go dim and everything is fine

its only when the front lights are turned OFF, that when I press my brakes its seemed like its acting like a dimmer

And with the keys out of car and depressing brake pedal it makes the Beep sound, which I normally get when I leave the lights on. But lights are OFF and brake depressed it BEEPS

only thing I have done since its add a bass box and amp.I am thinking it could be something to do with the remote wire. Not sure

Any help please?

thanks