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Citroen C3 Key Fob ReplacementIf your C3 key fob suddenly stopped functioning it could be due to a faulty module. If the key fob's function is functioning, the issue could be caused by something else, like water damage or a dead coin battery.The eC3 is targeting the mass market and hence Citroen has focused on making the service accessible to customers. It offers several features including virtual remote diagnosis and an app that is specifically designed for customer service.Dead coin batteryIf the unlock button on the key fob isn't working, or if the unlock button does not work, it could be that the battery in the coin is faulty. The battery should last between three and four years with regular use but it can fail abruptly. Luckily, car makers have built-in fail-safes to ensure that you can start and lock your vehicle even if your key fob is dead battery.The battery in the key fob is normally secured by metal clips that hold it in place. They complete the circuit. The battery may not be able to run if these clips are worn or dirty. The battery must be the right size and type. If the battery is too small or too large it will not fit on the fob and won't function properly.Key fob batteries are usually sold under various names, including CR2016 and CR2032 (though these are not interchangeable). Consult your owner's guide or look for a label on the fob that has the details.When you've got the proper battery and it's replaced, it's possible to replace it within a matter of minutes. Most fobs include a slider, a switch or a gap. These can be used to open the cover off and replace the old battery. Make sure that the new battery is the same voltage and that it is placed in the correct direction.Water damageEven if your key fob survived the wash cycle or an immersion in the pool, water is not ideal for electronics. It can damage the chip and destroy the battery. There are some things that you can do to limit the risk of damage.It's crucial to first eliminate the battery and then dry out the interior 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 a few days. You can speed up the process by placing it on a high shelf where it will not be disturbed. Once you're certain that the battery is totally dry, put in the new battery and use it in the same way as before.If your key fob is still not working, it could be that the receiver module in your car is damaged and is unable to transmit signals. It can be costly to fix, but it's worth trying to avoid having to buy a new one.The most straightforward method to fix a malfunctioning key fob, is to replace the battery. The radio signal will be restored and your key fob will function again after replacing the battery. If the issue persists you should seek professional assistance.Faulty receiver moduleIn some cases the key fob's transmitter module may have a defect that prevents it from receiving and transmitting the proper signal. In this scenario the car won't recognize the remote control key. It won't unlock or start. In this situation, you'll need to get another replacement.The steps for reprogramming the key fob differs based on make and model and model, so make sure you read the owner's manual before trying to do it yourself. First, ensure that the key fob's battery is in good condition and that all of its buttons are working. Close the doors and take out any aftermarket devices such as alarms or radios from your vehicle.You can also clean the chip using isopropyl or electronic cleaner. If the chip is fried, you will have to replace it.After you've cleaned the key fob, remove its circuit board. Then, use alcohol swabs to clean the contacts and let them dry in the air. Once the contacts have dried, you can put them back together and test the key fob. If it still doesn't work you may have to replace the battery. Make sure you choose an alternative battery that is able to provide the same voltage as your old one. Make sure to check the battery's position, because the contact points are very sensitive.Faulty keyless entry systemIt can be a hassle if the key fob stops working. The good news is that the majority of the time it's easy to get it working again. A dead coin battery is the most common reason for a malfunctioning fob. This can be easily replaced in a matter of minutes. Other causes include signal interferance or a damaged module, and other electrical problems.The first step is to ensure that the battery is properly installed and has the correct voltage. It is also essential to use the correct type. If you use a battery that is not properly sized or polarized battery can damage the internal circuitry. Also, you should check the fuses to make sure they're not blowing or melted.Another possibility is that the transponder inside the key could have been damaged or lost. This issue requires an examination by a professional mechanic or car dealer.Auto locksmiths and dealers will reprogram the key fob of the vehicle for a fee. However this can be costly. If you have an extra, it could be worthwhile to try reprogramming the fob yourself. In most cases, it is possible to find instructions in the owner's manual. If you don't have the manual, you can find instructions on the internet or on YouTube. It is imperative to check the owner's manual prior attempting any repairs to the key fob.