Component Description

WARNING: This page is about a different car, the 2015 Ford C-Max. However, it is still accessible from the selected car via links, so may be relevant.

Battery Monitoring Sensor

The Battery Monitoring Sensor continuously monitors the condition and the state of charge of the 12V battery and provides the BCM with this information. The Battery Monitoring Sensor also estimates losses in the battery capacity over time. The Battery Monitoring Sensor should only be reset when the battery is replaced. It is urgently recommended that the replacement battery has the exact same specification as the original battery. If it does not, the accuracy of the Battery Monitoring Sensor outputs will be compromised.

The Battery Monitoring Sensor is clamped directly to the negative terminal of the battery and grounds to the vehicle at the chassis ground connection point through the negative battery cable and eyelet. It is part of the negative battery cable and cannot be serviced separately. For more information, Refer to: Battery and Cables - System Operation and Component Description .

External customer loads must only be connected to the vehicle at the customer battery connection point. If an external customer load is connected at the negative battery post, the Battery Monitoring Sensor accuracy cannot be guaranteed. It is recommended that the Battery Monitoring Sensor pole clamp is not removed unless a battery replacement is required. Should the battery need to be isolated, this should be done by disconnecting the ground eyelet at the chassis ground.

Body Control Module (BCM)

The BCM monitors the Battery Monitoring Sensor and provides the PCM with battery state of charge information. For more information on the BCM, Refer to: Module Controlled Functions - System Operation and Component Description .

Powertrain Control Module (PCM)

The PCM provides desired voltage set point to the Direct Current/Direct Current (DC/DC) converter control module. For more information on the PCM, Refer to: Electronic Engine Controls - System Operation And Component Description .

Direct Current/Direct Current (DC/DC) converter control module

The Direct Current/Direct Current (DC/DC) converter control module is responsible for maintaining and charging the 12V battery. It is enabled when the high voltage battery contactors have closed, providing high-voltage power to the Direct Current/Direct Current (DC/DC) converter control module. For more information, Refer to: Direct Current/Direct Current (DC/DC) Converter Control Module - System Operation and Component Description .