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Citroen C3 Key Fob Replacement If your C3 key fob suddenly stopped functioning, it could be because of an inoperative module. If the key fob works it could be because of other issues, such as water damage or a dead battery. The eC3 is targeting the mass market, and Citroen has worked to make service easy for customers. It offers several features including virtual remote diagnosis as well as an app specifically for customer service. Dead coin battery If the unlock button on the key fob doesn't work, it may be that the battery inside the coin is defective. Battery life should range between three and four years with regular usage. However, it could abruptly die. Luckily, car makers have built-in fail-safes that ensure you are able to start and lock your car even if the key fob has a dead battery. The battery in the key fob is typically secured by metal clips that hold it in place. They complete the circuit. The battery may not be charged if the clips are dirty or worn. The battery should be the right size and type. If the battery is too small or too large it won't fit into the fob and will not work properly. Key fob batteries are typically sold under different names, such as CR2016 and CR2032 (though they're not interchangeable). Refer to the owner's manual for your model or look for a sticker on the fob that has the details. Once you've found the correct battery that you want to replace, it can be done in just a few moments. Most fobs have a slider gap, or switch that you can use to pry open the cover and swap out the old battery to get the new one. Make sure the new one is of the same voltage and that it is placed in the correct orientation. Water damage Even even if your key-fob has survived the wash cycle or swimming in the pool, it isn't ideal for electronics. It can cause damage to batteries and cause significant damage to the electronic chip inside. Fortunately, there are a few actions you can take to limit the damage. First, it's important to get rid of the battery and then dry out the interior and circuit board as much as possible. You can also employ a cotton swab coated in 90 percent isopropyl ethanol to clean the battery and circuit board. 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 shelf that isn't disturbed. Once you're certain that the battery is totally dry, you can put in a new one and use it in the same way as before. If the key fob isn't working, you could have a faulty receiver module that's not transmitting signals to your car. It can be expensive to repair, but it's worth it if you don't wish to replace your vehicle. The easiest solution to fix a broken key fob, is to replace the battery. Change the battery will restore the radio signal and make the key fob to work as it should. If the issue continues, you should seek assistance from a professional. A malfunctioning receiver module In some cases the key fob's receiver module may be affected by a fault that hinders it from receiving and transmitting the proper signal. In this scenario the car will not recognize the remote control key. It will not unlock or start. In this case you'll need a replacement. Consult your owner's guide before trying to modify the key fob by yourself. First, ensure that the battery in the key fob is in good condition and that all of its buttons are working. You should also close the doors and disconnect any additional devices such as alarm systems or radios from the vehicle. You might also try cleaning your chip with isopropyl alcohol or electronic cleaner. If the chip has become damaged, it will probably need to be replaced. After cleaning the key fobs, remove the circuit board. Then use alcohol swabs to clean the contacts and let them air dry. When the contacts are dry then you can reassemble the key fob and test it. If it's still not working you might need to replace the battery. Be sure to choose the new battery with the same voltage as the older one. It is recommended to check that the battery is installed correctly because the contact points are very sensitive. Faulty keyless entry system It can be a hassle If the key fob ceases functioning. The good news is that most of the time it's simple to get it back up and running. citroen key replacement for a malfunctioning key fob is a dead coin battery that can be replaced in a matter of minutes. Other causes include signal interference, malfunctioning receiver modules or other electrical issues. The first step is to ensure that the battery has the right voltage and is properly installed. It is also crucial to use the correct 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 aren't blown out or melted. Another possibility is that the transponder inside the key could have been damaged or destroyed. This issue requires further testing by a dealer in the car or a professional mechanic. A lot of auto locksmiths and dealerships can reprogram the fob of your car's keys for a fee, however this can be expensive. It may be worth it to reprogram your spare fob if you own one. It is possible to find instructions in the owner's manual. If you don't have the manual you can look up instructions online or on YouTube. Before attempting to repair the key fob, it is important that you consult the owner's guide.