i went to get a JVC KW-AVX810 double-DIN head unit installed in my one week old 2009 Prius today. The stock 6-speaker system head unit was taken out and replaced by the JVC unit. The installer read the 2004-2008 Prius app note from Metra Electronics, and put in the requisite 68ohm resistor. Once everything was finished up, i did NOT have A/C functions. Resistor was checked for proper resistance, and yes, it was sitting at 68ohms exactly according to his ohm meter. The installer then took the resistor out, and re-inserted 2 30Ohm resistors in its place. A/C came back up! anyone know why this would happen?