In a car, the location of the battery sensor may vary. For gasoline engines, the battery sensor is usually installed in the engine compartment; for diesel engines, the battery sensor is located in the trunk.
For models such as Mercedes-Benz, when removing a battery equipped with a battery sensor, it is necessary not only to loosen the nut of the cable fixing head, but also to disconnect the plug of the sensor before disconnecting the battery cable. This is to avoid possible sparks or contact bounces that cause LIN bus communication failures, which would put the battery sensor into a passive working state and unable to transmit data to the back seat.
Therefore, when removing the battery sensor, it is necessary to follow the above steps to ensure that the sensor's plug connection is disconnected.