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Citroen C3 Key Fob Replacement If your C3 key fob suddenly stopped working, it could be due to a faulty module. If the key fob works it could be due to other issues, such as water damage or a dead battery. Citroen hopes to meet the needs of the market of mass appeal by offering eC3. It has a range of features, including remote diagnostics via virtual technology and a dedicated customer support app. Dead coin battery If the unlock button on the key fob does not work, it may be that the battery for the coin is faulty. The battery is expected to last between three and four years with regular use but it is possible to die abruptly. Fortunately, automakers have built-in fail-safes that ensure you can start and lock your car even if the key fob is dead battery. The battery inside the key fob is held in place with metal clips that complete a circuit. The battery might not be able to run if these clips are dirty or worn. The battery should be of the correct size and type. If the battery is too small or large, it will not fit in the fob and will not function properly. Key fob batteries are often sold under various names, like CR2016 and CR2032 (though these are not interchangeable). The best way to determine which one to buy is to check your owner's manual, or look over the fob for an inscription that provides the exact information. Once you have the right battery, you can swap it in just a few minutes. Most fobs have a slider, gap, or switch that you can use to pry open the cover and swap out the original battery for the new one. Ensure that the new battery has the same voltage as the previous one and is correctly inserted. Water damage Water can be harmful to electronics, even if they have been through an wash cycle or dip. It can ruin a battery and cause serious damage to the electronic chip inside. Fortunately, there are citroen key shell can take to minimize the damage. It is crucial to get rid of the battery and dry out the interior and circuit board as much as possible. You can also clean the battery using a cotton-swab that is dipped in 90 percent alcohol. After you've cleaned the key fob, wait a few days for it to completely dry. You can accelerate the process by placing it on a shelf where it will not be disturbed. Once you're sure it's bone dry try putting in a new battery and operating it as usual. If the key fob does not work, you might have a defective receiver module that's not able to send signals to your car. It's costly to fix, but is worth it if you don't wish to replace your vehicle. The easiest method to fix a malfunctioning key fob, is to replace the battery. The battery change will restore the radio signal and make your key fob to work as it should. However, if the problem persists, you should seek professional assistance. The receiver module is not working properly. In some instances an issue with the receiver module of the key fob may prevent it from receiving or transmitting proper signals. In this case the car won't recognize the remote control key. It will not unlock or start. In this situation the replacement remote control is required. The steps to reprogram the key fob differs based on model and make, so consult your owner's manual before attempting to do it yourself. First, make sure that the battery in the key fob is in good health and that all of its buttons are working. Also, close the doors and disconnect any other aftermarket devices, such as radios or alarm systems from the vehicle. You can also clean the chip by using isopropyl or electronic cleaner. If the chip has become damaged it will likely need to be replaced. After you've cleaned your key fob, remove the circuit board. Clean the contacts with alcohol swabs and allow them to dry. After the contacts have dried, you can put them back together and test the key fob. If the key fob still isn't working, it might be required to replace the battery. Use a battery that has the same voltage that the original battery. It is recommended to ensure that the battery is in correctly because the contact points can be very sensitive. Faulty keyless entry system The key fob can be a fantastic feature for cars however it can be a hassle when it ceases to function. It's usually easy to get your key fob back up and running. The most common cause for a malfunctioning key fob is a dead coin battery, which can be replaced in minutes. Other causes include signal interference a bad receiver module or other electrical issues. The first step is to ensure that the battery is of the correct voltage and has been properly put in. The correct battery type is also crucial. The internal circuitry of the device may be damaged by using the wrong battery, or one that isn't the right size or one that is not polarized. Also, you should check the fuses to ensure they are not blown or melted. A transponder inside the key could be damaged or gone. This issue will require further investigation by a qualified mechanic or car dealer. Dealerships and auto locksmiths will reprogram the key fob on a vehicle for a fee. However it can be expensive. It may be worth it to reprogram your spare fob if you have one. It is possible to find instructions in the owner's manual. If you don't have the manual you can search for instructions online or on YouTube. Before you attempt to fix the key fob, it is vital to refer to the owner's manual.