I already asked Bjarne to share his design, and he said that he was not ready to let it go just yet (hopefully he would be willing to reconsider [-o<. I drive a C5 so I do not have the PIN issue. I am located in NY and from reading this thread I am pretty sure that Bjarne is in California so meeting up would be out. After I get the clock fixed (the initial step is the hardest part... I think) I should be able to get it to turn off the unit when the key is pulled out. I would be willing to meet somebody that has a PIN problem or Bluetooth unit to try and get the PIN and PTT fixed as well. My (current) design incorporates Flash memory so that you would be able to update the software in the future.