Conditions for Setting the DTC

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

DTC B2615 02

The BCM detects a short to ground in the dome/courtesy lamps control circuit terminal 1 X7.
The BCM detects a short to ground or an open/high resistance in the F23DA (BCM 2) fuse B+ circuit.
The BCM detects a short to ground or an open/high resistance in the F35DA (BATT 1) fuse B+ circuit.