Circuit/System Description
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
The body control module, upon receipt of a cargo unlock command from the remote keyless entry transmitter, will switch the cargo door unlock relay control circuit to battery positive voltage. This will energize the cargo door unlock relay activating the cargo door latch assembly