2008 Buick LaCrosse Owner's Manual - Page 77

Keys {CAUTION: Leaving children in a vehicle with the ignition key is dangerous for many reasons, children or others could be badly injured or even killed. They could operate the power windows or other controls or even make the vehicle move. The windows will function with the keys in the ignition and they could be seriously injured or killed if caught in the path of a closing window. Do not leave the keys in a vehicle with children. The key can be used for the ignition and all locks. The key has a bar-coded key tag that the dealer/retailer or qualified locksmith can use to make new keys. Store this information in a safe place, not in your vehicle. The vehicle has the PASS-Key® III vehicle theft system. The key has a transponder in the key head that matches a decoder in the vehicle's instrument panel. The key will have PK3 stamped on it. If a replacement key or an additional key is needed, it must be purchased from your dealer/retailer or certified locksmith. 2-3