Circuit/System Description

The battery current sensor is a 3-wire hall effect current sensor. The body control module (BCM) supplies 5 V and ground to the battery current sensor. The battery current sensor measures the amount of current flowing to or from the battery, and supplies a pulse width modulation (PWM) signal to the BCM. The signal has a normal range of 4-96 percent duty cycle. The BCM also monitors the current polarity, to detect if the sensor is installed backwards or on the wrong cable. The current should be negative when the engine is OFF, if the sensor is installed correctly.