only possible, if you connect it via "constant power plus" cable (like the tuning memory of the radio. What you can try is, to connect the lighter directly to the main plug of the radio (called pin "A4 = Constant Power" Color:White/Yellow"
For detailed info about the pin cable plug of the radio, look on Kojis Homepage at: http://www.legendtuner.com/
<ENTER> then <REPAIRS> then <G2 STERO AMP> then <PAGE 1 HEAD UNIT>
Here you´ll see the complete wiring of the radio !!!