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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 functions it could be due to something else, like water damage or a dead battery. The eC3 is aimed at the mass market and hence Citroen has been working to make service easier for customers. It has a range of features, such as remote diagnostics through virtual computers and a specialized customer service application. Dead coin battery If the unlock button on the key fob doesn't work, it could be that the battery inside the coin is defective. The battery should last between three and four years if used regularly, but it can die unexpectedly. Fortunately, automakers have built-in fail-safes that ensure you are able to start and lock your car even if the key fob is dead battery. The battery inside a key fob is usually secured by metal clips that hold it in place. They complete the circuit. If these are worn or filthy, the battery might not be able to receive power. The battery must be the correct size and type. If the battery is too small or too large it will not fit into the fob and won't perform as expected. Batteries for key fobs are sold under various names including CR2016 and CR2032. They are not interchangeable. The best way to determine what type you should buy is to refer to the owner's manual or look at the fob to find the label that gives you the specific details. When you've got the proper battery and it's replaced, it's possible to replace it in a matter minutes. Most fobs include the option of a slider, switch or a gap which can be used to open the cover open and replace the battery that was used. Make sure that the new battery has the same voltage as the previous one and is properly inserted. Water damage Even the case that your key fob escaped the wash cycle or swimming in the pool, water isn't good for electronics. It can damage the battery and cause severe damage to the electronic chip inside. There are, however, some ways to limit the damage. It's important to first remove the battery, and then dry out the interior as much as you can. You can also make use of a cotton swab that has been dipped in 90-percent isopropyl alcohol to clean the battery and the circuit board. After you've cleaned the key fob, wait a few days for it to completely dry out. You can accelerate the process by placing it on a high shelf that won't be disturbed. Once you're certain that the battery is dry, replace it with another battery and use it in the same way as before. If your key fob not working it could be because the receiver module in your car is damaged and cannot transmit signals. This could be expensive to fix, but it's worth trying if you want to avoid a costly replacement. The most straightforward way to fix a broken key fob is to replace the battery. Removing the battery can bring back the radio signal and make your key fob work once more. If the issue persists, you should seek out professional help. Receiver module that is defective In some instances the key fob's transmitter module could be defective that is preventing it from receiving or transmitting the correct signal. If this is the situation, your car will not recognize your remote control and will refuse to unlock or start the engine. In this case an alternative remote control will be needed. Read the owner's manual before trying to modify the key fob by yourself. Check that the battery on the key fob is in good condition and that the buttons are working. Also, shut the doors and remove any additional devices such as radios or alarm systems from the vehicle. You could also try cleaning the chip using isopropyl alcohol, or an electronic cleaner. If the chip is damaged it will likely need to be replaced. After cleaning the key fob, remove the circuit board. Then apply alcohol swabs clean the contacts and let them air dry. When thekeylab.co.uk are dry, you can reassemble the key fob and test it. If the key fob doesn't work, it might be required to replace the battery. Use a battery that has the same voltage that the original battery. It's also a good idea to check that the battery is placed in the correct position in the first place, since the contact points can be very sensitive. A malfunctioning keyless entry system It can be frustrating If the key fob ceases functioning. It's generally easy to get your key fob back working. A dead coin battery is the most frequent reason for a malfunctioning fob. It can be replaced in a matter of minutes. Other causes are signal interference or a damaged module, and other electrical problems. The first step is to make sure that the battery is correctly fitted and has the correct voltage. It is also important to use the correct battery type. The internal circuitry of the device could be damaged in the event of using an unsuitable battery. the proper size or is not polarized. Also, you should check the fuses to make sure they are not blown or haven't melted. Another possible problem is that the transponder within the key may have been damaged or lost. This issue will require further diagnosis by a car dealer or a professional mechanic. Many dealerships and auto locksmiths can reprogram the car's key fob for a small fee, but it can be costly. If you have a spare, it could be worth trying to reprogram the fob yourself. The instructions are usually found in the owner's manual. If you don't have the manual, you can locate instructions online or on YouTube. Before you attempt to fix the key fob, it is important that you consult the owner's guide.