Argh, wiring the unit to constant 12v power didn't do any good.

If I leave the player out of the dash for any length of time, I guess it assumes nothing is connected and it shuts itself down. Next time I insert the player, it has to go through the long "cold boot" re-acquisition of satellites.

Is there any way I can fake out the serial port so that it thinks there is still something connected even if there isn't? Like jumpering two pins or something?