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Car Key Repair – How to Fix a Dead Remote Car remotes offer great convenience to drivers. They can unlock doors, open trunks, and even start the car. Remotes that work with these remotes may stop working at the most inconvenient of moments. If you discover that your key fob is no longer working, try a few simple fixes before heading to the dealership. These tips could save you money. Keyless Entry System There's no need to search for keys in your pockets or purse. Just walk up to your car, push the button on the keyfob, and the doors will unlock and the engine will get started. It's a simple function that makes driving a car more comfortable and secure. But, like all devices that has a keyless entry system, the keyless entry system may fail due to repeated use or because of other factors. If you've experienced problems with yours, you have two options: Go to the dealer or contact the local locksmith. The way a keyless entry system works is by sending radio signals and then looking for a corresponding response from the key fob. If the system recognizes the signal, it triggers to unlock the vehicle doors and also activate the computer onboard. Some systems have another receiver mounted on the trunk of the car that will open automatically when you waggle your foot under it. Each key fob comes with an individual digital identity code that's issued by the manufacturer. The fob is programmed by a proprietary process called “programming”. car key immobiliser repair involves turning the ignition of the vehicle multiple times in a particular sequence. It could include pulling or pushing different buttons and levers, or taking out fuses. Once the key fob has been programmed into the keyless system of your car, it transmits a digital identification code and a function code to tell the car what to (lock, unlock or open the trunk). The car's receiver checks the authenticity of the transmitter by an authentication and encryption process. The onboard computer will unlock the vehicle and start the engine when it is authorized. A clever criminal could intercept and use the code sent between the keyfob and vehicle. This will require a device that records the transmission and then retransmits it when the system doesn't anticipate it. Most keyless entry systems use rolling codes to stop this. This ensures that each new transmitter signal received by a vehicle has a counter value that differs from the previous one. Batteries The most frequent cause of the car remote key fob not working is the battery is dead. If you have an extra key fob, it's a simple and inexpensive fix. Most fobs are powered by watches-style batteries, which are available at big-box stores or hardware stores for less than $10. A quick search on the internet or in your vehicle's owner manual should provide instructions on how to take apart your key fob and swap out the battery. Be careful not to damage any of the circuits or antennas within the case after you've removed the battery. If you do this the key fob will become unprogrammable and will not function. If you must move the key fobs, be careful. Certain key fobs could have fasteners that can easily be removed and scatter key fob pieces all over your living space. Most key fobs have a single hole for an screwdriver or similar tool to pop open the case, but it's a good idea put your tool on the outside of the case first, just as you would peeling an apple or orange. Don't apply too much pressure, as the case of the fob is usually constructed of plastic and could crack or break if you apply too much force to it. Make sure you match the size and type of the battery to the key fob when replacing it. Some key fobs have two batteries while others only need one. The wrong battery could render your remote keyfob useless. After the new battery is in place, test your key fob once more to see if it solves your problem. If it doesn't work then you'll be required to determine if your fob is experiencing a more complex issue that requires a professional diagnosis. It could be necessary to have your key fob reset at a dealer or buy a new one. Buttons The buttons on your key fob might be tiny but they're loaded with electronics. It's not a surprise that they malfunction from time to time. The good news is, when your car's key button fails to function, there's typically something you can do to fix it yourself. The most common reason that a car remote stop working is due to dirt or crud have trapped between the buttons. To fix this, remove the batteries with care and clean each button using the help of a cotton swab which has been submerged in ruby alcohol. Make sure to dry them completely before replacing the batteries. It's also possible that the key fob has been damaged in some way, possibly dropped on concrete or accidentally scratched by a sharp object. If this is the case, you can test your key fob's functionality by using another one. Another possibility is that the door sensor for your car's lock isn't working anymore. The sensor is a tiny metal component attached to the key fob's door lock button. It's not common for it to fail due to weather conditions or extended use. To activate the sensor again, simply try pressing your key fob a few times without locking or unlocking your doors to reset it. If all else fails, you can always test the functionality of a spare key by opening and locking your doors using it. If the spare key doesn't work, it could be necessary to find an emergency locksmith who can provide car key repair to get your remote working again. If your car key button is working, but it's still not locking or unlocking the vehicle, try to re-programme your computer system. If you have had the same key fob for a time, it might need to be reset every few months to continue working with your vehicle. It's not an ideal situation, but it's better than having to replace your remote completely.