Parasitic draw test. Connect an Ammeter in series in at battery. Make sure all domes lights, trunk list, ect are off. Give it 10-15 minutes for the PCM to go to sleep and check amperage reading. .050 A. And under is good. If you have aftermarket electronics that's always the best place to start if you have a parasitic draw. Pull a fuse and if the amperage drops you've got the culprit.
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