Hello,
Two things come to mind for this problem, first would be a bad ground at one of the circuits, next would be a bad BCM. Here are some wiring diagrams and BCM location (below) along with a guide to help you do some testing.
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
Check the ground for power that's how you know the ground is not working.
Please run some tests and get back to us we are interested to see what it is.
Cheers, Ken
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Thursday, June 29th, 2017 AT 11:54 AM