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Car Key Fob Repair – How to Get Back on the Road Even If Your Keyless Entry isn't Working Over time, key fobs may experience problems such as losing functionality. While some issues may require professional attention, the majority can be fixed at home. The first step is typically to change the battery. Most fobs utilize flat watch-style batteries that are readily available in hardware stores or auto parts stores. Dead Battery It can be a major issue when a key fob's battery is dead. This is especially true when you are far from home. There are solutions to get your car back on the road in case your keyless entry system has stopped working. One of the first things you should examine is whether the buttons on the key fob work. If they do not then the issue could be with the car's locks. If the keys won't unlock you need to look for a mechanical key slot hidden in the trim of your door handle or somewhere else on the vehicle (consult your owner's manual). Insert the mechanical key and try again. If this fails to unlock the door, some cars come with an app that allows you to unlock it remotely. For example the FordPass Connect app, the myChevrolet mobile app, and myMazda app allow owners to unlock their doors using their smartphones. However, these apps are subject to a monthly cost. Also, you should ensure that your key fob isn't draining the car's battery by being plugged into it. A dead key fob can drain your battery fast, especially if it is used to control the TV or phone while you are watching. A key fob that's just low on battery can be activated by holding it until you hit the start button. It's a quick fix that can save you a trip to the dealership or even select Interstate All Battery Center locations. If your key fob doesn't work try testing it in a vehicle with an electronic starter button. If it doesn't, you might need to replace the fob battery. It's a great idea to keep an extra key fob in your bag or purse. Damaged Buttons If your key fob doesn't have the ability to open doors or start the car remotely, it's possible that one or more of its buttons are damaged. Your key fob is equipped with an electronic circuit that has “contact pads” which are covered by an electrically conductor film. The film wears off over time. The wear may cause your device to respond slower or not at all. The good news is that the pad inside the key fob of a car is simple to replace and can be done so using a simple flathead screwdriver. If, however, the key fob is badly smashed or harmed in any way, it may be more difficult to remove the case, and you'll have to take the fob into an auto repair shop to be repaired. It's not uncommon for keys to be dropped on hard surfaces, trodden on or exposed to water. All of these events can cause physical damage to the keys, which could result in them breaking or snapping them. This could also alter the internals of the fob which could result in an issue. This is why it's recommended to keep an extra key fob in your pocket or wallet in the event that you break the one you have. Make sure the battery is charged first If your key fob's buttons aren't responding in the way they should. Be aware that key fobs don't come with a particular type of electronic device – most of them run on the same batteries for two dollars that are used in watches and hearing aids, which are readily accessible at hardware stores, drug stores, and online. If the battery is functioning properly, the buttons may be dirty or worn out. You can easily clean them with a damp cloth. If the buttons do not work, you can test another car key fob. This will help you determine whether the issue is yours or a specific model. If the other key fob works, then yours may need to be reprogrammed or replaced. Reprogramming The hidden world of car keys fobs is more complex than many myths suggest. Basic fobs operate with radio frequency signals that are specific to each car. The fobs must be properly programmed to unlock and begin the vehicle. Reprogramming a key fob is not as easy as pressing several keys. It's usually done by the dealer. Check the owner's manual for specific instructions. Some manufacturers, such as Mercedes utilize proprietary technology that guarantees only dealerships can design an entirely new fob and then sync it with your vehicle. However, some independent shops can provide this service as well and you should check reviews and prices before selecting a shop. Some car models will erase all other fobs once they're reprogrammed. This means that you'll need to have any additional fobs programmed by an expert. This is an expensive proposition, especially if you're down to one functioning fob. It's always wise to have at minimum a backup mechanical key that you can use to unlock the trunk and doors even if it doesn't start the car. If you attempt to reprogram your fob on your own, be prepared for a gruelling journey. You'll be disappointed with the numerous online guides that claim to be successful. A lot of these guides were written by people with no experience in this area and often are founded on unsubstantiated claims. Some of them even claim that you can program your car key fob with just a few clicks, which is extremely misleading. The majority of key fobs are secured by a clip made of plastic which is easy to remove, however, the battery is within the circuit board, and you'll need to carefully pull it out using a tool. You should be able find the button battery. It's usually an insignificant battery for a watch, which can be purchased at any pharmacies or home improvement stores. The replacement of the battery is generally an easy process, but it's always a good idea to test this first before replacing the entire unit. Replacement If the car key fob has been damaged or fails to function, it's important to know there are several ways to fix the issue. A quick fix can be as simple as replacing the battery or changing the program on the key fob, but a more thorough repair may be required. A spare fob can be helpful in the event that one is lost or stolen. Modern key fobs are more expensive and difficult to replace since they have a physical key along with electronics. Some “smart fobs” include remote starters. It's important to understand that it could take up to an hour to cut and program an alternative fob for your vehicle. Fobs utilize a small radio transmitter mounted on circuit boards to communicate with the car's receiver. Pressing a button activates the transmitter, which transmits an RF signal unique to the car's receiver. The receiver detects the signal and checks it against the preprogrammed codes. This allows the driver to open the vehicle and start it from a distance, without inserting the key into the ignition or turning the lock. If the buttons on the fob you have purchased fail to respond or function intermittently, it can indicate that they've been damaged by water or other causes. You can fix the fob by taking it apart and examine for damaged or non-responsive buttons. If this doesn't fix the problem, you can try reprogramming the fob or buying an entirely new one. You should check with a local auto dealer or a locksmith before purchasing a replacement keyfob online to ensure it is compatible with the security system of your vehicle. Aftermarket fobs can be cheaper however, you must study the brands and read reviews prior to attempting to program them yourself. While remote key repairs can be repaired by a trusted locksmith, others require special equipment for programming that can only be used by a car dealer or auto technician.