2010 Cadillac CTS Owner's Manual - Page 259

Driving and Operating 8-19 Ignition Positions (Keyless Access) You can turn the ignition control knob to four different positions. To shift out of P (Park), ignition must be in the ON/RUN or ACC/ ACCESSORY and the regular brake pedal must be applied. Make sure the keyless access transmitter is inside the vehicle when trying to turn the ignition control knob. A (LOCK/OFF): The ignition control knob cannot be removed from the vehicle. The keyless access transmitter must be inside the vehicle to start the engine. This position locks the ignition and shifter on automatic transmission vehicles, and the ignition and steering wheel on manual transmission vehicles. B (ACC/ACCESSORY): This position allows you to use things like the radio and the windshield wipers when the engine is off. This position will allow you to turn off the engine. C (ON/RUN): This position is for driving. It is the position the ignition switch returns to after the engine starts, and the control knob is released. If you need to shift the transmission out of P (Park), the ignition control knob has to be in ACC/ ACCESSORY or ON/RUN. The battery could be drained if you leave the key in the ACC/ ACCESSORY or ON/RUN position with the engine off. You may not be able to start your vehicle if the battery is allowed to drain for an extended period of time. D (START): This position starts the engine. Retained Accessory Power (RAP) These vehicle accessories can be used for up to 10 minutes after the engine is turned off: ... Audio System Power Windows Sunroof (if equipped) Using a tool to force the ignition control knob from its cylinder could damage it. Power to the audio system will work up to 10 minutes or until the driver door is opened.