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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 is still functional, the issue could be caused by something else, such as water damage or a dead battery for the coin. Citroen intends to cater to the masses by offering eC3. It comes with a variety of options, including virtual remote diagnostics and a dedicated customer support app. Dead coin battery If the key fob's unlock button isn't working, there is an issue with the coin battery. The battery should last between three and four years with regular usage but it is possible to die abruptly. Fortunately, automakers have built-in fail-safes to ensure that you can still start and lock your vehicle even if your key fob has a dead battery. The battery on the key fob is held in place by metal clips that form an electrical circuit. If they're worn or dirty, the battery may not receive the power. The battery must be the correct size and type. If the battery is too small or large it will not fit in the fob and won't function properly. Batteries for key fobs are available under various names, including CR2016 and even CR2032. These are not interchangeable. Consult your owner's guide or look for a label on the fob that has the information. If you've got the right battery, you can swap it in a few minutes. Most fobs come with a slider, gap, or switch that can be used to pry open the cover and exchange the old one for an alternative. Make sure the new one is of the same voltage and that it is placed in the correct direction. Water damage Even even if your key-fob has survived the wash cycle or a dip in the pool, water is not ideal for electronics. It can harm the chip and damage the battery. There are a few steps you can do to prevent the risk of damage. It is important to first take out the battery first, and then dry out the interior as possible. You can also make use of a cotton swab, dipped in 90-percent isopropyl alcohol to cleanse the battery and circuit board. After you have cleaned the key fob, you must let it dry for several days. You can speed the process up by placing it high on a shelf so it won't get disturbed. When you're certain that it is bone dry, put in a new battery and operating it as usual. If your key fob is still not working, it could be that the receiver module in your car is damaged and is not able to transmit signals. It's costly to repair, but worth it if your goal isn't to replace your car. The most straightforward way to fix a broken key fob is to change the battery. The radio signal will be restored and your key fob will work once you replace the battery. If the issue persists, you should seek professional help. Receiver module that is defective In some instances the key fob's reception module may have a defect that hinders it from receiving and transmitting the proper signal. In this situation, the car will not recognize the remote control key. It won't unlock or start. In this scenario the replacement remote control will be required. Refer to the owner's manual prior to attempting to program the key fob yourself. The first step is to ensure that the battery in the key fob is in good shape and that all buttons are working. You should also close the doors and remove any additional devices such as radios or alarm systems from the vehicle. You could also try cleaning the chip with isopropyl Alcohol or electronic cleaner. If the chip has become fried, you will have to replace it. Once you've cleaned and dried the key fob, take it off its circuit board. Then, use alcohol swabs to clean the contacts and let them dry in the air. After the contacts have dried, you can reassemble and test the key fob. If it's still not working, you may need to replace the battery. Make sure you use the latest battery that has the same voltage as your old one. It's also a good idea to check that the battery is placed in the correct position, as the contact points are very sensitive. Faulty keyless entry systems The key fob can be a fantastic convenience in vehicles However, it can be frustrating when it ceases to function. The good news is that, most times, it's easy to get it back up and running. The most common cause for a malfunctioning key fob is a dead battery for the coin which can be replaced within minutes. Other causes are signal interference, the receiver module is defective or other electrical issues. The first thing to do is to make sure that the battery is of the right voltage and is correctly inserted. It is also essential to use the correct battery type. The internal circuitry inside the device can be damaged if you use an unsuitable battery. the proper size or is not polarized. You can also check the fuses to ensure they aren't blown out or melted. A transponder in the key may be damaged or missing. This is a scenario that will require further diagnosis by a dealer in the car or professional mechanic. Auto locksmiths and dealerships can reprogram the key fobs of vehicles for a small fee. However this can be expensive. It might be worth it to reprogram your spare fob, if you have one. In citroen key battery type , you can locate the steps in your owner's guide. If you don't have the manual, you can search for instructions online or on YouTube. It is imperative to check the owner's guide before making any repairs to the key fob.