i was connect a new deck to my car,and it is work.but when i turn on the headlight,it will shut off and i press the power bottom,it wont on and my left side speaker is not working at all time.i dont know what problem is it.please everyone help me,and my deck is kenwood.

 

You have a loose connection with your left speaker wire. I dont know what the deal is with the healight thing unless someone screwed up your wiring before you got the car and some how ran the headlights into power with deck.

 

I bet you used an illumination/dimmer wire as a +12 or ground (can't remember off of the top of my head which that car uses)

 

Err by that car I meant Honda's in general since you didn't list it

 

My power control wires are connect to the Illumination wires,and which wires I suppost to connect the power control wires(what color is it?)and which wires I need to connect to the Illumination wires?

 

and if i am not connect the power control wires,and deck is not work also,i am tried to connect those wires,can somebody help me with it.i already connect the constant and the switch and ground.and now only have this power control and the illumnation left