2005 Cadillac DeVille Owner's Manual - Page 138

Reading Lamps Battery Load Management The battery load management feature is designed to monitor the vehicle's electrical load and determine when the battery is in a heavy discharge condition. During times of high electrical loading, the engine may idle at a higher revolutions per minute (rpm) setting than normal to make sure the battery charges. High electrical loads may occur when several of the following are on: headlamps, high beams, fog lamps, rear window defogger, the climate control fan at high speeds, heated seats and engine cooling fans. If the battery continues to discharge, even with the engine idling at a higher rpm setting, some electrical loads will automatically be reduced. When this occurs, the rear window defogger may take slightly longer to clear the glass, the heated seats may not get as warm as they usually do and the fan may cut back to a lower speed. For more battery saving information, see "Battery Saver Active Message" under DIC Warnings and Messages on page 3-60. The reading lamps are located on the overhead console on the headliner and in the rear door opening. These lamps come on automatically when any door is opened and it is dark outside. For manual operation, press the button to turn them on. Press it again to turn them off. If the reading lamps are left on, they automatically shut off 10 minutes after the ignition has been turned off. 3-22