Description And Operation - 12 Volt Battery System

WARNING: This page is about a different variant/trim than selected.

The 12 volt battery connects to the Power Distribution Center (PDC) to provide the electrical power for the vehicle modules and accessories. The battery will also absorb electrical spikes in the system. There is an Intelligent Battery Sensor (IBS) connecting in series on the negative battery cable which provides information about the battery to the Body Control Module (BCM) over a Local Interface Network (LIN) bus. The IBS monitors the current flow going out of the battery, and current flowing into the battery during charging to make these calculations. Some of the information stored and provided by the IBS are:

Battery voltage
Battery temperature
Battery State of Charge (SOC) - The battery SOC is the percentage of battery charge based on measured voltage, charge and discharge rates.
Battery State of Function (SOF) -The SOF is the calculated voltage that the battery will drop to when the starter is engaged to crank the engine.
Battery State of Health (SOH) - The SOH is the measurement of current battery capacity factoring the depreciation in battery health.

The BCM broadcasts this information over the CAN bus. The Powertrain Control Module will use the battery SOC to determine charge rates as well as when to allow features such as the Engine Stop/Start (ESS) system to function. The BCM will uses the battery information received from the IBS to make decisions on load shedding when battery SOC is determined to be low.