2007 Chevrolet Impala Owner's Manual - Page 113

Key In the Ignition Never leave your vehicle with the keys inside, as it is an easy target for joy riders or thieves. If you leave the key in the ignition and park your vehicle, a chime will sound, when you open the driver's door. Always remember to remove your key from the ignition and take it with you. This will lock your ignition and transaxle. Also, always remember to lock the doors. The battery could be drained if you leave the key in the ignition while your vehicle is parked. You may not be able to start your vehicle after it has been parked for an extended period of time. Retained Accessory Power (RAP) The vehicle has Retained Accessory Power (RAP), which will allow your vehicle's radio to work when the ignition key is in RUN or ACCESSORY. Once the key is turned from RUN to OFF the radio will continue to work 10 minutes or until the driver's door is opened. Also, the power windows will continue to work for up to 10 minutes or until any door is opened. 113