Battery drained by the stereo

Hello,

There could be two things causing this. First the BCM is not shutting off the radio or the radio is not shutting off internally. The best way to tell is to remove the radio and cut the two purple data lines to see if the radio shuts off if so the BCM is bad if not the radio is. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.