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 K114B Hybrid/EV Powertrain Control Module 2 activates the accessory wakeup serial data 2 circuit, when the vehicle power mode is in ACCESSORY mode or Ignition ON/Vehicle In Service Mode. The accessory wakeup serial data 2 circuit wakes up the devices for serial data bus communication.