Im having a simular problem.

When sitting in the car, I have the radio on. I turn the key off and remove it from the ignition.

all the power is off inside the cab (radio,lights,etc.)

I open the driver door and the srs light eluminates and the radio recives power and turns back on.

can someone shine some light on this for me? It really dosent cause a problem I just want to fix all the small things before they become worse.

Thanks