Description And Operation: Description

Vehicles have many control units that need large amounts of electricity. These units control their own system based on information from diverse sensors. It is important to maintain a stable power supply as these sensors give a variety of information. Battery sensor is mounted on battery (-) terminal. It transmits battery voltage, current, temperature information to ECM. ECM controls generating voltage by duty cycle based on these signals.

Courtesy of HYUNDAI MOTOR AMERICA

CAUTION:

When Battery Sensor signal fault occurs, check whether the parasitic draw is not abnormal.
(Refer to VEHICLE PARASITIC CURRENT INSPECTION )

NOTE: It takes a few hours for a new battery sensor to detect the battery state correctly.
Perform the following process after replacing the battery sensor.

Turn the ignition switch ON/OFF.
Leave the vehicle in parking mode for more than 4 hours.
After 4 hours, check that the SOC (State of Charge) of battery is displayed on GDS properly.

CAUTION: For the vehicle equipped with a battery sensor, be careful not to damage the battery sensor when the battery is replaced or recharged.

When replacing the battery, it should be the same (type, capacity and brand) as originally installed on your vehicle. If a battery of a different type is installed, the battery sensor may recognize the battery to be abnormal.
When installing the ground cable on the negative post of battery, tighten the clamp with specified torque of 3.9-5.9 N.m (0.4-0.6 kgf.m, 3.0-4.4 lb-ft). An excessive tightening torque can damage the PCB internal circuit and the battery terminal.
When recharging the battery, ground the negative terminal of the booster battery to the vehicle body.