good day This post is in regard to a 2006 PT Limited. I am looking for anyone's experience regarding non functioning front door speakers. The car has the 2 speakers in the dash - which are working, as well as functional rear speakers. Front door speakers have no sound even with the fade set to all front. The radio unit is the single cd type. I thought that the dash and front door speakers were driven by the same output wire pair from the radio, so the fact that the dash speakers work is confusing. So far I have checked the wires for output at the front door speakers and found audio signal. This condition exists on both left and right sides. Rear speakers are operational. Has anyone had a similar problem? Is this a common failure of these radios? To check the speaker wiring can I disconnect the radio and reconnect it without concern? Also- if I wish to install a used radio are there security codes that the new unit would need? Insights appreciated.