2010 Cadillac STS Owner's Manual - Page 123

If a door, hood, or the trunk is opened without the keyless access transmitter, the horn will sound for 30 seconds and the lamps will flash for two minutes. The vehicle cannot be started without a keyless access transmitter. The Theft-Deterrent system will not arm if : . Testing the Alarm 1. From inside the vehicle, roll down the window, then get out of the vehicle, keeping the door open. 2. From outside of the vehicle, with the door open, lock the vehicle using the power door lock switch or the keyless access transmitter and close the door. Wait about 30 seconds until the security light goes off. 3. Reach in and open the door using the inside door handle. The horn will sound and the exterior lamps will flash. You can turn off the alarm by pressing the unlock button on the keyless access transmitter or by starting the car. If the alarm does not sound when it should, check to see if the horn works. The horn fuse may be blown. To replace the fuse, see Fuses and Circuit Breakers on page 6‑117. If the fuse does not need to be replaced, you may need to have your vehicle serviced. To reduce the possibility of theft, always arm the Theft-Deterrent system when leaving your vehicle. Do not leave the key or device that disarms or deactivates the theft deterrent system in the vehicle. The key is used to turn the key cylinder to the lock position. The driver's door is locked using the power door lock switch after the doors are closed. . The vehicle can be programmed to automatically unlock the doors and disarm the theft‐deterrent system when you approach the vehicle and the keyless access transmitter is with you. See Vehicle Personalization on page 3‑58. Pressing the unlock button on the keyless access transmitter or using the key to unlock the driver's door disarms the theft-deterrent system. Unlocking a door any other way while the system is armed will activate the alarm. 3-23