2007 Buick LaCrosse Owner's Manual - Page 107

PASS-Key® III Operation Your vehicle is equipped with PASS-Key® III (Personalized Automotive Security System) theft-deterrent system. The starter will not work and fuel will stop flowing to the engine. If someone tries to start the vehicle again with the wrong key, the vehicle will not start. Anyone using a trial-and-error method to start the vehicle will be discouraged to do so because of the high number of electrical key codes. When trying to start the vehicle, if the engine does not start and the STARTING DISABLED warning message on the Driver Information Center (DIC) comes on, the key may have a damaged transponder. Turn the ignition off and try again. If the engine still does not start, and the key appears to be undamaged, try another ignition key. At this time, you may also want to check the fuse. See Fuses and Circuit Breakers on page 450. If the engine still does not start with the other key, the vehicle needs service. If the vehicle does start, the first key may be faulty. See your dealer who can service the PASS-Key® III to have a new key made. In an emergency, contact Roadside Assistance. See Roadside Assistance Program on page 484 for more information. PASS-Key® III is a passive theft-deterrent system. This means nothing special needs to be done to arm or disarm the system. It works when the key is inserted or removed from the ignition. PASS-Key III® uses a transponder in the ignition key that matches a decoder in the vehicle. When the PASS-Key® III system senses that the wrong key has been inserted into the ignition, it shuts down the vehicle's starter and fuel systems. 107