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Might be a long shot, but does the coolant water bottle overflow/exhaust/outlet (whatever it is) pipe point straight onto a rather large loom of wires that have 'joining' tape around them?
This is what I found on mine, and discovered water droplets always sat on this cable/joint. I redirected the overflow pipe elsewhere and my BCM doesn't seem to go nuts as often as it used to.
Coincidence possibly, worth a go? probably!
DIED/SCRAPPED: Chrysler Grand Voyager, 2004, automatic, CRD 2.8 LX CRV
Overhead single-disc DVD + Infra-Red headphones
Parrot CK3100 bluetooth mobile phone kit (+ relevant ISO connectors)
Modified line-inputs to CD/DVD player for custom MP3 player via 3.5" jack
Self-install rear parking sensors
Replaced engine thermostat
No longer a Chrysler GV owner, and very sad about it!