my lights keeps on blinking when the car is turned off. what might be problem

The brake light and signal lights all blink when the ignition is off and the car is sitting still which causes the battery to be dead.

Just to help, are any of the front lights "blinking" as well? Does it do this with the engine running also?

Those are the same lights that come on if you unlock the car with your key fob correct? Are you also noticing any interior lamps? Has anyone tried pulling codes from all of the modules on the car? I'd want to see this act up with a Tech II scan tool connected and see what modules (if any) are waking up when this occurs.

Turn off the hazard lights. (four way flashers)