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.

This diagnostic monitors the internal battery communication status between the K114B Hybrid/EV Powertrain Control Module 2 and the K112 Hybrid/EV Battery Interface Control Modules. The diagnostic monitors K112 Hybrid/EV Battery Interface Control Modules data availability whenever this private communications bus is active. The communication network between K114B Hybrid/EV Powertrain Control Module 2 and K112 Hybrid/EV Battery Interface Control Modules is in a daisy-chain architecture. Therefore, a break at any point in the communication bus results in a loss of K112 Hybrid/EV Battery Interface Control Modules communication with the K114B Hybrid/EV Powertrain Control Module 2. If any data is received, the diagnostic will report a pass. If no data is received for greater than 4.5 s, the K114B Hybrid/EV Powertrain Control Module 2 will attempt to initiate the K112 Hybrid/EV Battery Interface Control Modules into a communication mode where the K112 Hybrid/EV Battery Interface Control Modules can perform their own internal communication loop back, bypassing the daisy-chain. If this is the first K112 Hybrid/EV Battery Interface Control Module in the daisy-chain that the K114B Hybrid/EV Powertrain Control Module 2 cannot re-establish communication with, this diagnostic will fail.