Your radio has 2 blue wires. one of them provides a 12 volt turn on for a power antenna (when a cd is inserted that 12 volt turn on turns off, because when a cd is playing, the antenna doesn't need to be raised up). The other blue wire has a 12 volt turn whenever the radio or the cd is turned on--this is the blue wire that you need to connect to your amp remote line. ( pull out the radio and switch the blue wires)
respectfully,
Merle