Audio Systems: 2002 chevrolet trailblazer radio, 2002 chevy trailblazer, chevy trailblazer

Question
Dear sir,    I have a 2002 chevy trailblazer with a single cd head unit.  My wife drives this car.  I do not know how long the rear speakers have been out, but I do know that last week, the driver's side speaker went out.  I took the dash apart and looked at the connections at the speakers themselves and everything looked hooked up.  When I put everything back together, the drivers side speaker was working, but the back ones were not.  After driving the vehicle for a couple minutes, we went into a store.  When I turned the vehicle back on, the driver side speaker was out again.  Is there a reset for the bcm for this?  What can I do.  I have no door chime because that sound is broadcast out of the driver side speaker.  My wife like the door chime and the factory sound, I just need to get it working.  Any help would be greatly appreciated.  A few months ago, I had the battery replaced.  could this have anythig to do with the stereo speakers going out?  I have been reading alot about the stereo locking when the battery is disconnected, but this one still works, only out of the passenger side front.  Thanks, Andy

Answer
this radio is not lock and the speakers are not the problem
the chime warning comes from inside the radio  by data send fromt he bcm of the vehicle this sound more like a defective radio that it is lossing the outputs there is 2 ic chips for this rear and front
your radio needs to be service  sorry i can not help you more