2015 Cadillac CTS Owner Manual - Page 179

6-8 Lighting Lighting Features Entry Lighting The headlamps, taillamps, back-up lamps, license plate lamps, dome lamps, and most of the interior lights turn on briefly at night when K is pressed on the Remote Keyless Entry (RKE) transmitter. See Ignition Positions on page 9-16. After about 30 seconds the exterior lamps turn off, then the dome and remaining interior lamps dim to off. Entry lighting can be disabled manually by changing the ignition out of the OFF position, or by pressing Q on the RKE transmitter. This feature can be turned on or off. See "Vehicle Locator Lights" under Vehicle Personalization on page 5-47. Exit Lighting The headlamps, taillamps, back-up lamps, parking lamps, and license plate lamps come on at night, or in areas with limited lighting, when the key is removed from the ignition. The dome lamps also come on when the key is removed from the ignition. The exterior lamps and dome lamps remain on after the door is closed for a set amount of time, then automatically turn off. If equipped with Keyless Access, the exterior lamps and dome lamps automatically turn on when the driver door is opened after the ignition is turned off. See Ignition Positions on page 9-16. The exterior lamps turn off immediately by turning the exterior lamp control off. This feature can be changed. See Vehicle Personalization on page 5-47. Battery Load Management The vehicle has Electric Power Management (EPM), which estimates the battery's temperature and state of charge. It then adjusts the voltage for best performance and extended life of the battery. When the battery's state of charge is low, the voltage is raised slightly to quickly bring the charge back up. When the state of charge is high, the voltage is lowered slightly to prevent overcharging. If the vehicle has a voltmeter gauge or a voltage display on the Driver Information Center (DIC), you may see the voltage move up or down. This is normal. If there is a problem, an alert will be displayed. The battery can be discharged at idle if the electrical loads are very high. This is true for all vehicles. This is because the generator (alternator) may not be spinning fast