Battery Management System (If Equipped)
The battery management system monitors battery conditions and takes actions to extend battery life. If excessive battery drain is detected, the system may temporarily disable certain electrical features to protect the battery. Those electrical accessories affected include the rear defrost, heated/cooled seats, climate control fan, heated steering wheel, audio and navigation system. A message may be shown in the information displays to alert the driver that battery protection actions are active. These messages are only for notification that an action is taking place, and not intended to indicate an electrical problem or that the battery requires replacement.
Electrical accessory installation
Note:   Charging and replacing the battery requires the driver power window to be re-initialized.  See   Windows and Mirrors
To ensure proper operation of the Battery Management System, any electrical devices that are added to your vehicle should not have their ground connection made directly at the negative battery post.
A connection at the negative battery terminal can cause inaccurate measurements of the battery condition and potential incorrect system operation.
When a battery replacement is required, you must use a recommended replacement battery that matches the electrical requirements of the vehicle.
After battery replacement, or in some cases after charging the battery with the external charger, the Battery Management System requires eight hours of vehicle sleep time (key off with doors closed) to relearn the new battery state of charge.Prior to relearning the state of charge, the Battery Management System may disable electrical features (to protect the battery) earlier than normal.