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Citroen C3 Key Fob Replacement If your C3's key fob stops suddenly it could be due to a faulty receiver module. If the key fob still operates it could be due to another issue, such as water damage or a dead battery. The eC3 is aimed at the mass market, and Citroen has worked to make the service accessible to customers. It has a range of features, such as remote diagnostics through virtual computers and a dedicated customer service application. Dead coin battery If the unlock button on the key fob doesn't function, it could be that the coin battery is damaged. The battery should last between three and four years if used regularly, but it can die in a sudden manner. The car manufacturers have designed fail-safes which allow you to start and lock the car even if your key fob is dead. The battery in the key fob is normally secured by metal retaining clips that complete the circuit. The battery may not be able to run if these clips are worn or dirty. The battery must be of the correct size and type. If the battery is not big enough or large, it will not fit on the fob and won't work properly. Batteries for key fobs are sold under a variety of names including CR2016 and CR2032. These are not interchangeable. The best way to determine what type you should buy is to read your owner's manual or look at the fob to find an inscription that provides the exact information. If you've got the right battery, you can swap it in just a few minutes. Most fobs have the option of a slider, switch or a gap that can be used to open the cover open and replace the old battery. Make sure the new one has the same voltage and is inserted in the correct orientation. Water damage Even the case that your key fob escaped the wash cycle or taking a dip in the pool, it isn't good for electronics. It can cause damage to a battery and cause serious damage to the electronic chip inside. Fortunately, there are some ways to limit the damage. First, it's crucial to get rid of the battery and then dry out the interior and circuit board as much as is possible. You can also use a cotton swab dipped in 90-percent isopropyl alcohol to clean the battery as well as the circuit board. After you have cleaned the key fob, it is recommended to dry it for a few days. You can speed up the process by placing it on a shelf where it will not be disturbed. When you're sure the battery is completely dry, insert another battery and use it in the same way as before. If your key fob is not working it could be because the receiver module in your car is faulty and cannot transmit signals. This can be quite expensive to repair, but it's well worth trying to avoid the expense of a replacement. The easiest method to fix a damaged key fob is to replace the battery. The radio signal should be restored and your key fob will function again after replacing the battery. If the issue persists, you should seek assistance from a professional. Faulty receiver module In some instances the key fob's transmitter module may be affected by a fault that is preventing it from receiving or transmitting the proper signal. If this is the situation, your car will not recognize the remote control key and will not be able to unlock or start the engine. In this scenario you'll need another replacement. Refer to the owner's manual prior to attempting to program the key fob yourself. Make sure that the battery of the key fob is in good health and that the buttons are working. Close the doors and take out any accessories, such as alarms or radios from your vehicle. You can also try cleaning the chip using isopropyl alcohol or electronic cleaner. If the chip has been damaged, you'll need to replace it. After cleaning the key fob, take it off the circuit board. Then, clean the contacts with alcohol swabs, and let them dry. When the contacts are dry you can reassemble your key fob and test it. If it doesn't work you might need to replace the battery. Be sure to choose an alternative battery that is able to provide the same voltage as the previous one. Make sure to check the battery's position, as the contact points are very sensitive. Keyless entry systems with malfunctions The key fob can be a fantastic convenience in vehicles, but it can be frustrating when it ceases to function. It's usually easy to get your key fob back working. The most common cause of a malfunctioning key fob is a dead battery for the coin that is easily replaced in a matter of minutes. Other reasons include signal interference, a bad receiver module or other electrical issues. The first step is to ensure that the battery is running at the correct voltage and has been properly put in. The correct type of battery is also important. The internal circuitry of the device could be damaged if you use batteries that are not the proper size or the correct polarized. relevant webpage is also advisable to check the fuses to make sure they're not blown or have not been melted. A transponder inside the key may be damaged or gone. This issue will require further investigation by a qualified mechanic or dealer in cars. Many auto locksmiths and dealerships can reprogram a car's key fob for a small fee, but this can be expensive. If you have a spare, it could be worthwhile to try reprogramming the fob yourself. In most cases, you can get instructions from the owner's manual. If you don't have a manual, you can find instructions online or on YouTube. It is crucial to check the owner's manual before attempting any repairs on the key fob.