Circuit/System Description
WARNING: This page is about a different car, the 2016 Chevrolet Malibu Limited. However, it is still accessible from the selected car via links, so may be relevant.
The B110 Battery Sensor Module (BSM) provides current data to the ECM. The ECM uses a Battery State Estimator (BSE) algorithm to determine the state of charge of the primary 12 volt battery for use in controlling the stop/start feature. The BSE monitors the current differences between the battery current sensor and the BSM.