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Citroen C3 Key Fob Replacement If your C3 key fob suddenly stopped functioning, it could be because of an issue with the module. If the key fob is still functional, the issue could be caused by something else, like water damage or a dead coin battery. The eC3 is going after the mass market and Citroen has worked on making the service accessible to customers. It comes with a variety of options, including virtual remote diagnostics and a dedicated customer support app. Dead coin battery If the unlock button on the key fob does't work, it may be that the battery for the coin is not working properly. Battery life should be between three and four year with regular usage. However, it could suddenly die. Fortunately, most car manufacturers have built-in fail-safes that ensure you can still unlock and start your car even if the key fob has a dead battery. The battery inside a key fob is usually secured by metal retaining clips that complete the circuit. If they're worn or dirty, the battery might not be able to receive power. The battery should be the correct size and type. The battery won't fit into the fob if it's too large or too small. Key fob batteries are often sold under various names, such as CR2016 and CR2032 (though they're not interchangeable). The best way to determine which type to purchase is to refer to your owner's manual, or examine the fob for a sticker with a label which provides you with the precise details. When you've got the proper battery, it can be replaced in a matter minutes. Most fobs include either a slider or switch or a gap that can be used to pry the cover open to replace the old battery. Make sure the new battery is of the same voltage as your old one and that it is inserted correctly. Water damage Even the case that your key fob escaped the wash cycle or taking a dip in the pool, it isn't ideal for electronics. It can damage the battery and cause severe damage to the electronic chip inside. Fortunately, there are things you can do to limit the damage. It's important to first remove the battery, then dry out the interior as possible. You can also make use of a cotton swab that has been that has been dipped in 90 percent isopropyl alcohol to clean the battery and circuit board. After you've cleaned your key fob, you should wait a few days for it to completely dry out. You can speed it up by placing it on a shelf so it doesn't get smashed. Once you're sure that it's bone dry try replacing the battery and operating it as usual. If your key fob not working it could be because the receiver module in your car is defective and is unable to transmit signals. It's expensive to repair, but worth it if you don't want to replace your vehicle. The easiest method to fix a damaged key fob is to change the battery. Change the battery will bring back the radio signal and make your key fob work once more. If the issue continues, you should seek professional assistance. The receiver module is not working properly. In some cases an issue with the receiver module of the key fob may stop it from receiving or transmitting proper signals. If this is the case, your car won't recognize the remote control key and will refuse to unlock or start the engine. In this scenario you'll have to purchase another replacement. Read the owner's manual before attempting to modify the key fob by yourself. Check that the battery on the key fob is in good working order and that all buttons are functioning. Close the doors and remove any other devices from the aftermarket, such as alarms or radios from the vehicle. You could also try cleaning the chip with isopropyl alcohol or electronic cleaner. If the chip is in a state of disintegration it is likely to need to be replaced. Once you've cleaned and dried the key fob, you can remove its circuit board. Then, use alcohol swabs to clean the contacts and let them dry in the air. When the contacts are dry you can put them back together key fob and test it. If the key fob still does not work, it might be necessary to replace the battery. Make sure you choose the latest battery that has the same voltage as the old one. It is also a good idea to make sure the battery is placed in the correct position and that the contact points can be very sensitive. Keyless entry systems that aren't working properly It can be very frustrating if the key fob stops working. The good news is that most of the time it's easy to get it working again. A dead coin battery is the most common reason for a broken fob. It can be replaced within minutes. Other causes are signal interference, the receiver module is defective and other electrical issues. The first step is to ensure that the battery is properly fitted and has the correct voltage. It is also crucial to use the correct battery type. The internal circuitry of the device could be damaged in the event of using the wrong battery, or one that isn't the proper size or is not polarized. You should also examine the fuses to make sure they are not blown or have not been melted. A transponder that is inside the key could be damaged or not functioning properly. This is a problem that requires further testing by a car dealer or a professional mechanic. Auto locksmiths and dealerships can reprogram the car's key fob for a fee, however it can be costly. If you have a spare, it might be worth trying to reprogram the fob yourself. In the majority of cases, you will find instructions in your owner's guide. If G28 don't have the manual, you can find instructions online or on YouTube. Before attempting to fix the key fob, it's essential to read the owner's guide.