Battery drained by the stereo

2001 CADILLAC DEVILLE DTS
12,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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CRAIG RADEBAUGH
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My battery was drained overnight. Got a new one. Same problem. My brother narrowed it down to the stereo and pulled the fuse. No more drain, he thinks it may be a relay but has not had the time to figure it out. Any ideas?
Jun 22, 2019 at 1:33 PM
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STRAILER
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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.
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Jun 24, 2019 at 3:42 PM