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How to Program a Car Key Modern cars use more than just a single key to start the engine, they also come with a remote that can lock and unlock doors. These key fobs have to be programmed in order to function. Certain keys for cars can be programmed by the owner themselves but it is best to speak with an expert. This will help to avoid any damage to the car's computer system and also ensure that the new key functions correctly. How do you program the key Up until the turn of the 21st century, the majority of cars had basic key systems. Keys were made from metal and had grooves to correspond to the internal parts of the ignition cylinder. As technology advanced the number of car manufacturers began to combine electronic and physical protocols to avoid theft. These key systems are referred to as transponder keys or chip keys, and are designed to make it difficult for thieves to start the vehicle. The key chips contain an unique serial number that transmits a message to the receiver inside your car. When programming car key is received it is compared to the code that is stored in the car's computer. If the codes are compatible, then the car will start. If the codes don't match, your vehicle won't start at all. This is one of the main reasons to keep a spare key in your car, especially in the case of an electronic transponder. If you want to learn how to program keys, you'll need certain equipment. You'll need an uncut key that matches your car model and make. You can purchase them from the locksmith shop or at a car dealership, but it's important to purchase the correct keys. If you use a key that is for another model, it will not work. To begin the process, insert the new key into the ignition and turn it to the “on” position. You'll need to keep the new key in this position for approximately 10 minutes and 30 seconds. After the time has passed, you can remove your key and see if the security indicator on your dashboard has gone out. If it did not you'll have to repeat the process a third time. Keep in mind that this method can only work on GM vehicles but it's not 100% secure. If you're looking for a more secure and reliable method, you should consult a professional locksmith or the dealer to have your car programmed with a chip. These professionals are equipped with the tools and equipment required to access the onboard diagnostics port of your vehicle and make the change. Keyless Entry Systems Keyless entry systems allow property access without requiring the use of a physical ID. Security is achieved through a combination between sensors and an onboard computer. It is possible to control and monitor the system from anywhere in the property. Keys and locks are not required. The system can also identify and disable stolen or lost cards. In addition, the newest models are cloud-based, allowing for remote management and configuration. Modern automobiles are equipped with keyless entry systems. The system works by emitting radio signals that are received by the keyfob. The signals are compared with the code that is stored in the car's computer, and if all is in order the car will be able to unlock. If the signals don't match then the car won't start. There are a variety of steps you can take to program your new key fob, if it isn't already programmed. First, you'll need to make sure that all doors except the driver's door are locked. Also, you'll need the original key fob, as well as any extras you'd like to program. You may also visit your local auto parts store to see if they have the appropriate tool for your car. If none of these methods work, you'll have to consult the owner's manual or a professional locksmith. Once you have the right tool, follow the manufacturer's instructions to begin reprogramming your key fob. This procedure is usually quick and simple. For instance, you may be asked to insert your new key into the ignition while keeping all doors shut and then press the button on the key fob within a brief time period. The car might respond by turning off the doors or emitting an audible chime, which is a sign that the key was successfully programmed. A lot of locksmiths have tools that let them bypass the built-in EEPROM security of the key fob of your car or remote. This is a dangerous method and can corrupt the data in your car's computer. This should be left to a professional who can lower the chance of data corruption and make sure that your keys are properly programmed. Transponder Keys Transponder keys, also referred to as chip keys, come with a microchip embedded in the head of the key. When the key is inserted into the barrel of the ignition lock and then turned to ON the antenna ring emits an energy burst through the transponder chip. The chip absorbs this energy, and then transmits a radiofrequency signal that contains an identification code. This code matches the unique digital serial numbers of the computer of the car. This is to prevent any attempts by anyone else to start the car as only the proper keys will be able to do so. It is believed that this technology will be more secure than conventional car keys because it makes it more difficult for thieves to “hot wire” the vehicle and get it started. It's not foolproof and thieves have found ways of tricking and defeating the system. So even cars with transponder key are not protected from theft. You may be able program a transponder key yourself if you have an instrument that works with your vehicle. The key programmer comes with a manual that walks you step-bystep through the process. Follow the instructions and switch on the security lights on your dashboard before you start your engine. You can ask a professional locksmith to help you if you are not confident with a key programmer or if you own a car that has more advanced features, like remote head keys or intelligent keys. They'll have the tools and equipment needed to cut an uncut key, erase the old one from the computer in the car, and then program the new key to function properly. This will help you save money and time, and keep your car's safety system functioning just as it should. It is also safer than making it yourself. Making use of the wrong key programmers or following unofficial guides can alter the information stored in the vehicle's system and result in the new key not functioning. Remotes You may need to reprogram your car keys if they don't work. This is a simple procedure for most modern vehicles that have key fobs. However, certain models are more complex and require programming with the aid of an instrument that is available from the auto locksmith or dealer. To decrease the risk of theft from vehicles, modern car manufacturers have improved the security of their key systems. The key system is designed to prevent hot-wiring (the method of using the key of another vehicle to start the engine) and other similar methods. To make this process work you'll require at minimum two key fobs that are functioning for your vehicle. It's essential to have at minimum two spare keys in your possession. The key fobs have electronic chips that communicate using radio signals with the car's receiver. The computer in the car then compares the key's code to the one stored in its database. If the codes match the car will begin. If the codes don't match then the car will not start or will remain dead. Most of these electronic key can be programmed and replaced by a professional locksmith or auto dealer using the appropriate equipment. The process should be relatively simple if you can find a cheap key programmer on the internet or at an auto parts store. You'll need to follow a set of steps that include inserting the key into the ignition, turning it on, without activating the engine, and then turning off the key. You will need to repeat the steps a specific number of times over the timeframe you specify to put your vehicle in programming mode. The door locks will be triggered or a chime will sound. Some modern vehicles are capable of being programmed using a tool that is connected to the onboard diagnostic port or EEPROM programming. These tools are expensive and therefore are not accessible to most car owners. Many experts in the field recommend consulting an experienced auto dealer or locksmith to program your keys.