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Citroen C3 Key Fob Replacement If your C3's keypad stopped working all of a sudden, it could be due to a malfunctioning receiver module. If the key fob still functions, it could be due to something else, like water damage or a dead battery. Citroen hopes to meet the needs of the market of mass appeal with its eC3. It has a range of features including virtual remote diagnosis and an app specifically for customer service. Dead coin battery If the key fob's unlock function isn't working, there is a problem with the battery of the coin. 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 that permit you to start and lock the car even if your key fob is dead. The battery on the key fob is secured by clips made of metal that form an electrical 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 will not fit on the fob and will not perform as expected. Key fob batteries are sold under a variety of names including CR2016 and CR2032. They are not interchangeable. Consult your owner's guide or look for a sticker on the fob which contains the details. If you've found the right battery and it's replaced, it's possible to replace it in a matter minutes. Most fobs come with a slider, switch, or gap that can be used to pry open the cover and swap out the old battery to get an alternative. Make sure the new battery is of the same voltage and is inserted in the correct direction. Water damage Even the case that your key fob escaped the wash cycle or an immersion in the pool, it isn't good for electronics. It can damage the chip and damage a battery. Fortunately, there are ways to limit the damage. First, it's crucial to remove the battery and dry the interior and circuit board as much as you can. You can also clean the battery by using a cotton swab, which has been dipped into 90-percent alcohol. After cleaning the key fob you should let it dry for several days. You can speed up the process by placing it on a shelf where it will not be disturbed. Once you're certain that the battery is totally dry, insert the new battery and use it as usual. If your key fob is not working, it could be that the receiver module in your car is damaged and isn't able to transmit signals. It's costly to fix, but is worth it if your goal isn't to replace your vehicle. The simplest way to fix an faulty key fob, is to replace the battery. Changing the battery should bring back the radio signal and make the key fob to work as it should. However, if the problem persists then you should seek out assistance from a professional. The receiver module is not working properly. In certain situations the key fob's reception module could have a problem that is preventing it from receiving or transmitting the correct signal. If this is the case, your car won't recognize your remote control key, and will not allow you to unlock or start the engine. In this situation it is likely that a replacement remote will be needed. The steps for reprogramming keys differ based on model and brand therefore, you should consult the owner's manual before trying to do it yourself. Check that the battery on the key fob is in good health and that all buttons are functioning. Close the doors and take out any other devices from the aftermarket, such as radios or alarms from the vehicle. You can also try cleaning the chip with isopropyl Alcohol or electronic cleaner. If the chip is fried it is likely to be replaced. Once you've cleaned and dried the key fob, remove the circuit board. Then use alcohol swabs to clean the contacts and let them air dry. After the contacts have dried, you can reassemble and test the key fob. If it doesn't work, you may need to replace the battery. Be sure to choose an alternative battery that is able to provide the same voltage as the older one. It is also a good idea to ensure that the battery is installed correctly, as the contact points are very sensitive. Faulty keyless entry system It can be very frustrating when the key fob stops working. It's not difficult to get your key fob back up and running. The most typical cause of a malfunctioning key fob is a dead coin battery, which can be replaced in a matter of minutes. Other reasons include signal interference, the receiver module is defective and other electrical issues. The first step is to ensure that the battery is properly inserted and has the right voltage. The correct type of battery is also vital. Using a wrongly sized, or polarized battery can damage the internal circuitry. It is also advisable to check the fuses to make sure they're not blowing or melted. Another possible problem is that the transponder within the key could be damaged or destroyed. This problem will require further investigation by a qualified mechanic or car dealer. Auto locksmiths and dealers can reprogram the fob of the key in a vehicle for a fee. However this can be expensive. G28CarKeys might 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 do not have the manual, you can find the instructions online or on YouTube. Before you attempt to fix the key fob, it's crucial to consult the owner's guide.