2005 Cadillac STS Owner's Manual - Page 207

BATTERY NOT CHARGING SERVICE CHARGING SYS (System) This symbol appears with the BATTERY NOT CHARGING SERVICE CHARGING SYS message. BATTERY VOLTAGE HIGH This symbol appears with the BATTERY VOLTAGE HIGH message. This message will display when a problem with the charging system has been detected. Have your vehicle serviced by your GM dealer. This message will display when the electrical charging system is overcharging the battery. When the system detects that the battery voltage is above approximately 16 volts, this message will be displayed. To reduce the charging overload, use the vehicle's accessories. Turn on the exterior lamps and radio, set the climate control on AUTO and the fan speed on the highest setting, and turn the rear window defogger on. The normal battery voltage range is 11.5 to 15.5 volts when the engine is running. You can monitor battery voltage on the DIC by pressing the information button until you find BATTERY VOLTS. BATTERY SAVER ACTIVE This message will display when the system detects that the battery voltage is dropping beyond a reasonable level. The battery saver system will start reducing certain features of the vehicle that you may not be able to notice. At the point that the features are disabled, this message is displayed. It means that the vehicle is trying to save the charge in the battery. Turn off all unnecessary accessories to allow the battery to recharge. The normal battery voltage range is 11.5 to 15.5 volts. You can monitor battery voltage on the DIC by pressing the information button until you find BATTERY VOLTS. 3-75