Radio head unit is power on but get no sound from cd,hhd,radio,bluetooth,nav.... Testing voltage & ohm on wire connector & speaker are good. No clue how to test AMP unit. buy other AMP from LQK still can't resolve my issue. Any clue about it ? Does after market AMP might be work for my sound system? please advise.. Thanks

 

Is this random? Or did you have anything aftermarket on the cars audio? Did you try and change something and it went out?

Seems like the amp would be the problem if the speakers are not working in any situation. As far as testing it, no clue, have you checked the service manual floating around here?

 

I was bought other AMP from ebay, connector plugin to the AMP, but still have no sound. Its went out something. I didn't change anything seem i own the car.