1999 Cadillac DeVille Owner's Manual - Page 193

yellowblue Theft-Deterrent Feature THEFTLOCKR is designed to discourage theft of your Audio Steering Wheel Controls Some audio controls can be adjusted at the steering wheel. They include the following: 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. VOLUME: Press the up arrow lever to increase volume and the down arrow lever to decrease volume. 3-37