2015 Cadillac ATS Owner Manual - Page 50

Keys, Doors, and Windows If the engine does not start and the security light stays on, there is a problem with the system. Turn the ignition off and try again. If the vehicle will not change ignition modes (ACC/ACCESSORY, ON/ RUN/START, OFF), and the RKE transmitter appears to be undamaged, try another transmitter. Or, you may try placing the transmitter in the transmitter pocket located in the center console. See Key and Lock Messages on page 5-36. If the ignition modes will not change with the other transmitter, your vehicle needs service. If the ignition does change modes, the first transmitter may be faulty. See your dealer. 2-19 The security light, in the instrument cluster, comes on if there is a problem with arming or disarming the theft-deterrent system. The system has one or more RKE transmitters matched to an immobilizer control unit in the vehicle. Only a correctly matched RKE transmitter will start the vehicle. If the transmitter is ever damaged, you may not be able to start your vehicle. When trying to start the vehicle, the security light comes on briefly when the ignition is turned on. It is possible for the immobilizer system to learn new or replacement RKE transmitters. Up to eight transmitters can be programmed for the vehicle. To program additional transmitters, see "Programming Transmitters to the Vehicle" under Remote Keyless Entry (RKE) System Operation on page 2-2. Do not leave the key or device that disarms or deactivates the theft-deterrent system in the vehicle.