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Citroen C3 Key Fob Replacement If the key fob on your C3 stopped completely, it could be due to a defective receiver module. If the key fob is functional, the issue could be due to something else, like water damage or a dead coin battery. Citroen is aiming to reach the market of mass appeal with its eC3. It comes with a variety of features, including virtual remote diagnosis and an app specifically designed for customer service. Dead coin battery If the unlock button on the key fob does't work, it could mean that the coin battery is not working properly. genuine citroen key fob replacement should last between three and four years if used regularly but it can fail abruptly. Fortunately, automakers have built-in fail-safes to ensure that you can still unlock and start your car even if your key fob has a dead battery. The battery inside the key fob is held in place with metal clips that complete the circuit. If they're worn or filthy, the battery might not receive electricity. The battery must be the correct size and type. If the battery is too small or large, it won't fit into the fob and won't function properly. Batteries for key fobs are sold under many names such as CR2016, and even CR2032. These batteries are not interchangeable. Consult your owner's guide or look for a label on the fob that has the details. Once you have the right battery, you can replace it in just a few minutes. Most fobs have either a slider or switch, or a gap that can be used to pry the cover open and replace the old battery. Be sure that the new battery is of the same voltage as the previous one and is inserted correctly. Water damage Water is bad for electronics, even if they have been through an wash cycle or dip. It can cause damage to the chip, and even destroy a battery. There are, however, some ways to limit the damage. First, it's important to remove the battery and dry the interior and circuit board as much as is possible. You can also clean the battery by using a cotton swab, which has been dipped into 90-percent alcohol. After you've cleaned the key fob, wait a few days for it to completely dry. You can speed up the process by placing it on a high shelf that isn't disturbed. Once you're certain that the battery is totally dry, insert a new one and use it as usual. If the key fob does not work, you might have a problem with the receiver module that's not transmitting signals to your vehicle. It can be expensive to repair, but it's worth it if you don't want to replace your car. The most straightforward solution to fix a broken key fob is to replace the battery. The radio signal should be restored and your key fob should work once you replace the battery. If the issue continues, you should seek out professional help. The receiver module is not working properly. In some cases the key fob's receiver module could be defective that is preventing it from receiving or transmitting the proper signal. In this instance the car will not recognize the remote control key. It will not unlock or start. In this scenario, a replacement remote control will be needed. Read the owner's manual before attempting to modify the key fob by yourself. Ensure that the battery of the key fob is in good working order and that all buttons function. Close the doors and remove any devices that are not from the market, like radios or alarms from the vehicle. You might also try cleaning your chip using isopropyl alcohol or electronic cleaner. If the chip is fried it is likely to be replaced. After you've cleaned your key fob, remove its circuit board. Then use alcohol swabs to clean the contacts and let them air dry. After the contacts have dried you can reassemble your key fob and test it. If the key fob still doesn't work, it might be required to replace the battery. Choose a new battery that has the same voltage as the old battery. Double-check the battery's placement, as the contact points of the battery are extremely sensitive. Keyless entry systems with malfunctions It can be quite frustrating when the key fob stops functioning. It's not difficult to get your key fob back functioning. The most frequent cause of a malfunctioning key fob is a dead coin battery which is easily replaced in a matter of minutes. Other causes include signal interference, malfunctioning receiver modules, and other electrical problems. The first step is to ensure that the battery is properly installed and has the correct voltage. It is also essential to select the correct battery type. If you use a battery that is not properly sized or polarized one could cause damage to the internal circuitry. You can also check the fuses to make sure they're not blown or have not been melted. Another possibility is that the transponder contained in the key could be damaged or even lost. This will require a an investigation by a professional mechanic or a dealer for cars. Auto locksmiths and dealers can reprogram the key fobs of vehicles for a small fee. However it can be expensive. If you have an extra, it could be worth attempting to reprogram the fob yourself. In most cases, you can locate the steps in the owner's manual. If you don't own the manual, you can find instructions online or on YouTube. It is essential to read the owner's manual prior attempting any repairs to the key fob.