Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
The park neutral switch that sends the signal to turn on the rear lamps to the BCM requires battery voltage from the key being on. So that leaves the body control module as the faulty part for the reverse lights coming on while the vehicle is off.
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Which lights are you having the issue with the OEM reverse lights or the ones you have added?
The add ons, are they wired into the 7 pin trailer connector harness or another way?