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Citroen C3 Key Fob Replacement If the key fob on your C3 stopped functioning suddenly it could be due a defective receiver module. If the key fob still operates, it could be because of something else like water damage or a dead battery. The eC3 is aimed at the mass market and Citroen has worked to make service easy for customers. It comes with a variety of options, such as remote diagnostics through virtual computers and a specialized customer service app. Dead coin battery If the key fob's unlock button is not working, there may be a problem with the coin battery. citroen key should be between three and four year with regular usage. However, it is possible for it to suddenly die. The car manufacturers have designed fail-safes which allow you to start and lock the car even if the key fob is dead. The battery inside a key fob is usually held in place by metallic clips that form the circuit. The battery might not be powered if these clips are worn or dirty. The battery should be the right size and type. The battery won't fit into the fob if it's too big or too small. Key fob batteries are often sold under different names, including CR2016 and CR2032 (though they're not interchangeable). The best way to determine what type you should buy is to check your owner's manual or look at the fob for the label that provides the exact details. When you've got the proper battery you can replace it in a matter of seconds. Most fobs include an e-slider, a switch, or a gap that can be used to open the cover open and replace the battery that was used. Make sure that the new battery is of the same voltage as your old one and that it is inserted correctly. Water damage Water is harmful to electronics, even if they have survived washing cycles or a dip. It can damage the chip, and even destroy a battery. Fortunately, there are ways to limit the damage. It is essential to first get rid of the battery, and then dry the inside as much as you can. You can also clean the battery using a cotton swab that has been submerged in 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 shelf that won't be disturbed. Once you're sure it's bone dry, try putting in a brand new battery and operating it as normal. If your key fob still not working it could be because the receiver module in your car is faulty and cannot transmit signals. It's expensive to repair, but it's worth trying if you want to avoid having to buy a new one. The simplest way to fix a malfunctioning key fob is to change the battery. The radio signal will be restored and your key fob should work again after changing the battery. If the issue persists you should seek professional help. Faulty receiver module In some instances the key fob's receiver module may be affected by a fault that stops it from receiving and transmitting the proper signal. If this is the case, your car won't recognize your remote control and will not allow you to unlock or start the engine. In this scenario it is likely that a replacement remote will be required. The steps to reprogram the key fob are different for each make and model So, make sure to 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 function. Close the doors and remove any devices that are not from the market, like radios or alarms from the vehicle. You can also clean the chip using isopropyl or electronic cleaner. If the chip is fried it is likely to need to be replaced. Once you've cleaned and dried the key fob, take it off its circuit board. Then apply alcohol swabs clean the contacts and let them air dry. After the contacts are dry, you can reassemble and test the key fob. If it still doesn't work you may have to replace the battery. Choose a replacement battery that has the same voltage that the original battery. It is also a good idea to double-check that the battery is placed in the correct position and that the contact points can be very sensitive. Keyless entry system malfunctions It can be frustrating If the key fob ceases working. The good news is that, most times, it's easy to get it working again. A dead battery for the coin is the most frequent cause of a malfunctioning fob. It can be repaired in just a few minutes. Other causes include signal interference, the receiver module is defective or other electrical issues. The first step is to ensure that the battery is correctly inserted and has the right voltage. It is also essential to select the correct battery type. The internal circuitry of the device could be damaged by using a battery that is not the proper size or is not polarized. Examine the fuses for damage or been melted. A transponder inside the key may be damaged or absent. This problem will require an investigation by a professional mechanic or car dealer. Auto locksmiths and dealers will reprogram the fob of the key in the vehicle for a fee. However this can be expensive. If you have an extra, it could be worth attempting to reprogram the fob yourself. In most cases, it is possible to get instructions from your owner's guide. If you don't have the manual, you can look up instructions online or on YouTube. Before attempting to fix the key fob, it's essential to read the owner's manual.