Circuit/System Description
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
The accessory wakeup serial data 2 circuit is energized by the K114B Hybrid/EV Powertrain Control Module 2 to immediately activate the G1 A/C Compressor connected to this circuit when the K9 Body Control Module signals the K114B Hybrid/EV Powertrain Control Module 2 that serial data is required.