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Good day and thanks for the help. My 996 C4 cab, has been great, but new battery, and now no GPS, will not accept the GPS CD, does not recognize the radio or cd, six player system. unit has power, I did disconnect, took out the three fuses, re connect the battery / returned back the fuses, have power, entered the PCM code, and no anything. Any HELP......is greatly appreciated, thanks.