experiencing this forst time in my life.have a 2005 jdm corolla,for AC repairs whole dash board was opened,steering sound system and all were taken out and after repairs again were fitted back,AC got fine,but the problem started is that speakers make a lot of noise if in the start of the day i turn on the ignition switch ,i then use low volume button and sound stops,its very annoying . sometimes the sound doesnt stops and i have to start the car and low the volume then the sound system, i suspect some mistake in the fitting back has been done , need some valuable suggestons from people who have faced same situation.thanks.