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Car Key Repair – How to Fix a Dead Remote Car remotes are a wonderful convenience for drivers. They can unlock doors, open trunks, and even start the engine. These remotes can stop working at the most inconvenient moments. If you discover that your key fob no longer working, try a few fixes before going to the dealer. These steps may save you money. Keyless Entry System There's no need to search for keys in your purse or pockets. Just walk to your car, push the button on the keyfob, and the doors will be opened and the engine will get started. It's a simple function that makes driving a car more comfortable and safe. But just like any device it's possible that the keyless entry system could fail due to repeated use or because of other factors. If you've had issues with yours, you have two options: Go to the dealership or call the local locksmith. Keyless entry systems operate by sending radio signals, and then scouring for a response signal from the key fob. If the system recognizes the signal, it triggers to unlock the vehicle doors and activate the computer onboard. Certain systems have a second transmitter on the trunk of the car that can be opened when you put one foot underneath it. Each key fob is assigned a unique digital identification code by the manufacturer. The fob is programmed by a unique process called “programming”. This involves turning the ignition of the car several times in a specific sequence, and could require pulling buttons or levers, or even removing the fuse. Once a key fob has been programmed into the keyless system of your car, it transmits a digital identification code as well as a function-code to instruct the car to (lock, unlock or open the trunk). The receiver in the car confirms that the transmitter is who it claims to be through an authentication and encryption process. The computer in the car will unlock the vehicle and start the engine if it's authenticated. There are concerns that a skilled criminal could intercept the code that's transmitted between the key fob and the car. This will require a device that records the transmission, and then retransmits it when the system doesn't expect it. To combat this, most keyless entry systems use a method called rolling code that ensures that every new signal from the transmitter received by the vehicle has a different counter value than the previous one. Batteries A dead battery is the most common reason for the car remote to not work. If you have an extra key fob it's a simple and inexpensive fix. you can try this out of fobs are powered by watch-style batteries that can be bought at big-box stores or hardware stores for less than $10. You can find instructions to disassemble the key fob on the internet or in your car's manual. Be careful not to harm any antennas or circuits in the case after you've removed your battery. If you do this, the key fob will be unprogrammable and won't work. If you must move them, do it slowly because some key fobs come with fasteners that are able to pop open and scatter key fob components throughout your living space. Most key fobs come with one hole that allows the screwdriver or another pry tool to open the case, but it's a good idea to use your tool to wedge it around the outside of the case first, like you were peeling an orange or apple. Do not apply too much pressure as the case of the key fob is usually composed of plastic and can crack or break when you exert too excessive force. When you're ready to replace the battery, be sure to match its size and type to the key fob. you can try this out require two batteries, whereas others have just one, and the wrong battery can quickly make your key fob remote useless. Once the new battery is installed, test your key fob for the second time to see if the battery has fixed your issue. If this fails, you will have to determine if the fob is experiencing an issue that is more complicated and requires a professional diagnosis. If this is the case, you may need to have it changed by a dealer or buy a replacement key fob completely. Buttons The tiny buttons on your key fob are pretty small, and are filled with delicate electronics. Therefore, it's not surprising that they're likely to fail from time to time. If your car key button suddenly stops working, you'll be able to usually fix it yourself. One of the most frequent reasons that a car key remote stops working is that dirt or crud has accumulated between the buttons. To get rid of this take care to remove both batteries and scrub each button by using a cotton swab, coated with alcohol rubbing. Make sure you dry the batteries completely before reinstalling them. It's possible that the key fob was harmed somehow, perhaps dropped on concrete, or perhaps damaged by something sharp. If this is the situation, you can check your key fob's functionality by using a different one. Another possibility is that the door lock sensor in your vehicle has stopped working. It's a tiny metal part that's connected to the door lock button on your key fob and it's not uncommon for this sensor to break following prolonged usage or exposure to harsh weather conditions. Press your key button a few times without locking or unlocking your doors. This resets the sensor. If all other options fail, you can test the functionality of a spare key by trying to open and close your doors with it. If the spare key doesn't work, it may be necessary to find an 24 hour locksmith that can offer automobile key repair in order to get your remote working again. You can reprogram your computer if your car key button works but does not lock or unlock the vehicle. If you've used the same key fob for a while, it may require reprogramming every few months to to work with your vehicle. It's not ideal, but it is better than having to purchase another remote.