2003 Cadillac CTS Owner's Manual - Page 248

Navigation/Radio System (Option) Your vehicle may be equipped with an AM-FM radio navigation radio system that includes digital sound processing (DSP), Radio Data System (RDS) with program type selections (PTY) that will seek out the kind of music you want to listen to. The radio system can also communicate with your navigation system to broadcast announcements on traffic, weather and emergency alert communications. For information on how to use this system, see the "Navigation/Radio System" supplement. THEFTLOCKR is designed to discourage theft of your radio. Your vehicle has a "built-in" theft-deterrent feature on each radio that is automatic -- there is no programming required. The radio in your vehicle cannot be used in any other vehicle. When the radio was originally installed in your vehicle at the factory, it stored the Vehicle Identification Number (VIN). Each time the ignition is turned on, the VIN is verified. If the vehicle's VIN does not match the VIN stored in the radio, THEFTLOCK will be activated and the audio system will not play. If the radio is removed from your vehicle, the original VIN in the radio can be used to trace the radio back to your vehicle. Theft-Deterrent Feature Navigation/Radio Display and Controls The display screen is located in the center of the instrument panel. 3-27