BMW X5 battery discharging issue with automatic window activation when locked on BMW X5

Some BMW X5 owners report experiencing battery discharge issues related to automatic window activation when the vehicle is locked. These problems may arise if the 12-volt battery has been replaced or disconnected, leading to windows that do not fully close automatically and require manual intervention. Additionally, a faulty Telematics Control Unit (TCU), which controls functions such as Teleservices and BMW Assist, can contribute to battery drainage. Owners may also encounter complications due to the vehicle's safety features, which prevent auto window movements if the door is open. Issues with window switches or control modules can further complicate automatic window activation. Lastly, some owners find that disconnecting the Intelligent Battery Sensor (IBS) harness from the negative battery cable can help isolate faults related to the battery system. It is recommended that owners perform appropriate diagnostics or seek professional assistance to resolve these concerns effectively.