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Citroen C3 Key Fob Replacement If your C3's key fob stops working all of a sudden, it could be due to a malfunctioning receiver module. If the key fob remains functioning, the issue could be due to something else, such as water damage or a dead coin battery. The eC3 is going after the mass market, so Citroen has worked on making service easy for customers. It offers several facilities such as remote diagnostics through virtual computers as well as a specialized customer service app. Dead coin battery If the unlock button on the key fob does't work, it could be that the battery in the coin is not working properly. Battery life should range between three and four years with regular use. However, it is possible that it will suddenly die. The automakers have created fail-safes that permit you to start and lock the car even if your key fob is dead. The battery in the key fob is typically secured by metal clips for retaining that complete the circuit. The battery may not be charged if the clips are worn or dirty. The battery should also be the correct size and type. The battery won't fit into the fob if it is too big or too small. Key fob batteries are typically sold under different names, such as CR2016 and CR2032 (though these are not interchangeable). Read the owner's guide for your particular model or look for a sticker on the fob with the details. If The Key Lab found the right battery that you want to replace, it can be done in just a few moments. Most fobs come with a slider, switch, or gap that can be used to pry open the cover and exchange the old battery to get a new one. Make sure that the new battery has the same voltage and is inserted in the correct way. Water damage Water is bad for electronics even if they've been through a wash cycle or a dip. It can ruin the battery and cause severe damage to the electronic chip inside. There are some things that you can do to reduce the risk of damage. First, you must get rid of the battery and dry out the inside and circuit board as much as is possible. You can also employ 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, you should wait several days for it to completely dry. You can speed it by placing it on a shelf so that it will not be disturbed. When you're sure the battery is dry, replace it with a new one and use it as usual. If the key fob still doesn't work, you may have a faulty receiver module that's not able to send signals to your vehicle. It's expensive to fix, but it's worth it if you don't wish to replace your vehicle. The most straightforward way to fix a faulty key fob is to change the battery. The radio signal will be restored and your key fob will function again after replacing the battery. If the problem continues, you should seek assistance from a professional. The receiver module is not working properly. In some cases, the key fob's receiver module may have a defect that stops it from receiving and transmitting the correct signal. In this scenario the car won't recognize the remote control key. It won't unlock or start. In this instance an alternative remote control will be needed. Consult your owner's guide before trying to reprogram the key fob on your own. First, check that the battery in the key fob is in good working order and that all of its buttons are working. Also, close the doors and remove any other aftermarket devices, such as radios or alarm systems from the vehicle. You might also try cleaning your chip with isopropyl Alcohol or electronic cleaner. If the chip has become fried, you will need to replace it. After you've cleaned your key fob, you can remove its circuit board. Then, use alcohol swabs to clean the contacts and let them dry in the air. After the contacts are dry then you can reassemble and test the key fob. If it doesn't work you may have to replace the battery. Use a battery that has the same voltage that the original battery. Double-check the battery's placement, because the contact points are very sensitive. Keyless entry system that isn't working properly It can be quite frustrating If the key fob ceases working. The good news is that, most of the time it's a breeze to get it back up and running. The most common cause of a malfunctioning key fob is a dead battery for the coin that can be replaced in minutes. Other reasons include signal interference, an ineffective receiver module and other electrical issues. The first step is to ensure that the battery is properly placed and has the proper voltage. The correct battery type is also essential. The internal circuitry inside the device can be damaged if you use the wrong battery, or one that isn't the right size or is not polarized. Examine the fuses to determine if they are damaged or been melted. A transponder in the key may be damaged or gone. This is a problem that requires further examination by a car dealer or a professional mechanic. Dealerships and auto locksmiths will reprogram the key fobs of a vehicle for a fee. However it can be expensive. If you have a spare, it might be worth attempting to reprogram the fob yourself. You can usually find instructions in the owner's manual. If you don't have the manual, you can find the instructions online or on YouTube. Before you attempt to repair the key fob, it is vital to refer to the owner's manual.