Cadillac 2006 CTS Navigation System Manual page 113

Battery Voltage High
This message indicates that 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 selecting Battery Voltage from the
Vehicle Information menu.
This symbol appears with
the Battery Voltage High
message.
Battery Voltage Low
This message will appear when the electrical system is
charging less than 10 volts or if the battery has been
drained.
If this message appears immediately after starting the
engine, it is possible that the generator can still recharge
the battery. The battery should recharge while driving
but may take a few hours to do so. Consider using
an auxiliary charger to boost the battery after returning
home or to a final destination. Be sure to follow the
manufacturer's instructions.
If this message appears while driving or after starting
your vehicle and stays on, have it checked by your dealer
immediately to determine the cause of this problem.
To help the generator recharge the battery quickly, you
can reduce the load on the electrical system by
turning off the accessories.
This symbol appears with
the Battery Voltage Low
message.
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