Battery Monitoring Sensor

WARNING: This page is about a different car, the 2013 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Unless the battery is being replaced, DO NOT reset the battery monitoring sensor using the scan tool. This reset is reserved for new battery installation. This reset clears the learned battery data, the battery time in service, and affects the aging parameters, which have been learned since the installation of the battery.

The battery monitoring sensor is attached to the negative battery terminal which provides a ground to the sensor. The battery monitoring sensor is integrated with the negative battery terminal clamp and cable assembly and cannot be serviced separately. The battery monitoring sensor measures voltage, current and temperature of the battery and uses these inputs to calculate the battery condition, transmitting this information through the LIN circuit to the BCM. The battery monitoring sensor has a 2-pin connector providing battery voltage and LIN connections. The battery monitoring sensor has to be recalibrated at regular intervals. This occurs during a rest period or when the battery closed-circuit current is less than 100mA. The rest period must last for at least 3 hours. This recalibration must take place every 7 days. If the system has been unable to carry out a recalibration within this time then it is impossible to confirm the exact state of charge of the battery. Any devices left attached to the power socket that draw in excess of 100mA (or less depending on other battery loads) = prevents a battery monitoring sensor recalibration.

The battery monitoring sensor is an input to the Electrical Energy Management software. If the sensor malfunctions due to wiring issues or failure, a DTC sets. In most cases the Electrical Energy Management functions are turned off until the sensor operation is restored

If the battery monitoring sensor is removed from the battery negative post, all internal parameters except battery time in service reset to a standard setting. These parameters are relearned during normal recalibration intervals. If the battery has been charged or jump started by connecting directly to the battery post or to the battery monitoring sensor, force an internal reset by removing the battery monitoring sensor from the battery negative post then reconnecting.