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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 can have issues, such as a losing functionality. Some issues may need professional attention, but many are fixable at home. Changing the battery is often the first step. The majority of fobs are powered by flat watches-style batteries that is easily available in hardware or auto parts stores. Dead Battery When a key fob battery is dead, it could be a huge inconvenience, especially if you're away from home. There are methods to get your vehicle back on the road in case your keyless entry system has stopped working. One of the first things to check is to determine if the key fob's buttons still work. If they do not then the issue could be with the locks on your car. If the keys aren't unlocking try looking for a key slot with a mechanical lock concealed in the trim of your door handle or in another location on the car (consult the owner's manual). Insert the mechanical key, and try again. If this doesn't unlock the door, some cars come with an app that allows you to unlock it remotely. FordPass Connect MyChevrolet Mobile App, myMazda apps, for example let owners unlock their doors using smartphones. These apps charge a monthly fee for subscription. Also, you should ensure that your key fob isn't draining the car's battery by sitting on it. key repairs can drain your battery fast, especially if it is used to control the TV or phone while you're watching. A key fob that's low on battery can be activated by holding it right up to the start button. This quick fix can save you from having to visit your dealer or to certain Interstate All Battery Centers. You can also determine whether your key fob is actually dead by trying it in another vehicle with the push-button ignition. If it doesn't work, you might need to replace the battery in your fob. It's a great idea to keep a spare key fob in your purse or backpack. Damaged Buttons If your key fob doesn't have the ability to open doors or start your vehicle remotely, it's possible that one or more of its buttons are damaged. Your key fob is equipped with a circuit with “contact pads” that are covered with an electrically conductive film. This film wears off over time. This wear could cause your fob to respond more slowly, or even not respond at all. The good news is that the pad in the car key fob is simple to replace and can be done so with the help of an easy flathead screwdriver. If the key fob is severely damaged or broken in any way, it could be more difficult to open up the case, and you'll be required to take the fob to an auto shop for repair. It's not uncommon for keys to be dropped on hard surfaces, walked on or exposed to water. All of these events can cause physical damage, such as breaking and snapping keys. This can also affect the internals of the fob, which could lead to an issue. It's a good idea so, always keep a spare fob in your wallet or in your pocket in case the one you're using is damaged. Check the battery first if your key fob buttons aren't working like they should. Key fobs do not require any special electronic device. They utilize the same battery for two dollars that is used in hearing aids and watches. They are sold at hardware, drug, and online stores. If the battery is functioning properly, the buttons may be worn or dirty. You can easily clean them using a damp cloth. If the buttons still don't work, you could try another car key fob. This will help determine whether the issue is yours or a specific model. If the other fob works then it's likely the key fob you have needs to be reset or perhaps replaced entirely. Reprogramming The secret world of car keys fobs is more complex than the myths that surround it suggest. The basic fobs operate using radio frequency signals that are assigned to specific vehicles. 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 is usually handled by the dealer. Refer to the owner's manual for specific instructions. Some manufacturers, such as Mercedes utilize proprietary technology that ensures only dealerships can design an entirely new fob and then sync it to your vehicle. Some independent shops may also offer this service, so be sure to read reviews and prices before selecting the right shop. Some car models will erase other fobs after they've been changed, so you'll need to get any additional fobs professionally programmed. This can be costly, especially if your fob is no longer working. Even in the event that the mechanical key will not start the car, it's a good idea to have a backup option that can open the doors and trunk. If you do attempt to reprogram your fob yourself be prepared for a frustrating journey. You'll be disappointed with the numerous online guides that claim to be successful. Many of these guides were written by people who have no experience in this area, and they're often based on unsubstantiated claims. Some even claim that you can program your own car key fob in just a few clicks, which can be very false. The battery is usually held in place with a plastic clip, which is easily removed. However the circuit board houses the battery, and you'll need to pry the battery out using the aid of a tool. Once you get inside, you should be able locate the button cell battery, which is typically a tiny watch battery that is available at most pharmacies or at home improvement stores. It's typically easy to replace the battery. Before replacing the entire unit, it's worth trying first. Replacement If your car key fob has been damaged or isn't functioning it is important to know there are several ways to remedy the problem. An easy fix could be as simple as replacing the battery or reprogramming the key fob, but a more in-depth repair may be required. A spare fob can be useful in the event one is lost or taken. Modern key fobs are more expensive and difficult to replace due to the fact that they have the physical key along with electronic. Some “smart fobs” even come with a remote starter. It's important to know that it can take an hour or more to cut and program the replacement fob to your vehicle. Fobs utilize a small radio transmitter on circuit boards to communicate with the car's receiver. Pressing an appropriate button will activate the transmitter, which sends a unique RF signal to the car's receiver. The receiver receives the signal and checks it against preprogrammed codes. This allows a driver to start the car from a distance without the need to put the key in the ignition. If the buttons on your key fob fail to respond or function intermittently it could indicate that they've been damaged by water or other causes. It is possible to repair the fob by taking it apart and inspecting for any broken or non-responsive buttons. If this doesn't fix the issue, try reprogramming the fob or purchasing another one. Before you purchase a replacement fob on the internet, consult an expert locksmith or your local dealer to make sure it's compatible with the security system of your vehicle. The fobs from the aftermarket can be less expensive however, you must research brands and read reviews prior to trying to program them yourself. While some fobs can be replaced by a reputable locksmith others require special equipment to program them that can only be used by a car dealer or auto technician.