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Citroen C3 Key Fob ReplacementIf the key fob on your C3 stopped working all of a sudden, it could be due to a defective receiver module. If the key fob still is working, it could be because of something else like water damage or a dead battery.Citroen is aiming to reach the market of mass appeal by offering eC3. It comes with a variety of options, like remote diagnostics that can be performed remotely and a dedicated customer support application.Dead coin batteryIf the key fob's unlock function isn't working, there may be an issue with the coin battery. Battery life should be between three and four year with regular usage. However, it is possible for it to suddenly stop working. Fortunately, car manufacturers include fail-safes in their products so that you can still start and lock your vehicle even if your key fob has a dead battery.The battery on the key fob is secured by metal clips that form a circuit. The battery might not be able to run if these clips are worn or dirty. The battery should be the correct size and type. The battery won't fit into the fob if it's too large or small.Key fob batteries are typically sold under different names, like CR2016 and CR2032 (though they aren't interchangeable). Consult your owner's guide or look for a sticker on the fob that has the details.Once you've found the correct battery, it can be replaced in a matter of seconds. Most fobs have a slider gap, or switch that you can use to break open the cover and swap the old one for the new one. Be sure that the new battery is of the same voltage as the older one and is inserted correctly.Water damageWater is bad for electronics even if they've been through the wash cycle or a dip. It can ruin the battery and cause severe damage to the electronic chip inside. There are, however, some actions you can take to limit the damage.First, it's important to get rid of the battery and dry out the inside and circuit board as much as possible. You can also clean the battery by using a cotton-swab that has been dipped in 90 percent alcohol.After cleaning the key fob you need to let it dry for several days. You can speed the process up by placing it on a shelf to ensure it doesn't get smashed. Once you are sure that the battery is dry, replace it with another battery and use it as normal.If the key fob isn't working, you could have a defective receiver module that's not able to send signals to your vehicle. It can be costly to repair, but it's worth trying to avoid a costly replacement.The easiest method to fix a damaged key fob, is to replace the battery. Changing the battery should restore the radio signal and make the key fob work once more. However, if the problem persists, you should seek professional help.A malfunctioning receiver moduleIn some instances an issue with the receiver module of the key fob might cause it to stop receiving or transmitting the right 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 case, you'll need to get a replacement.Consult your owner's guide before trying to reprogram the key fob yourself. Ensure that the battery of the key fob is in good shape and that all buttons function. Close the doors and take out any devices that are not from the market, like radios or alarms from the vehicle.You might also try cleaning your chip with isopropyl Alcohol or electronic cleaner. If the chip has become damaged, it will probably need to be replaced.After you've cleaned your key fob, you can remove its circuit board. Then, clean the contacts using alcohol swabs and let them dry. Once the contacts are dry you can reassemble them and test the key fob. If it doesn't work you might need to replace the battery. Make sure you choose a battery with the same voltage as the battery you replaced. It's also a good idea to check that the battery is placed in the correct position because the contact points can be very sensitive.Faulty keyless entry systemThe key fob is a great convenience for cars However, it can be a hassle when it ceases to function. It's typically easy to get your key fob back running. The most typical cause of a malfunctioning key fob is a dead coin battery which can be replaced in minutes. Other causes include signal interferance or a defective module, as well as other electrical issues.The first step is to make sure that the battery is correctly fitted and has the correct voltage. It is also crucial to use the correct battery type. The internal circuitry of the device can be damaged if you use the wrong battery, or one that isn't the correct size or polarized. Examine the fuses for damage or if they have melt.A transponder in the key could be damaged or missing. click for source will require further diagnosis by a professional mechanic or a dealer for cars.Auto locksmiths and dealers will reprogram the key fob on vehicles for a small fee. However it can be expensive. If you have an extra key, it may be worthwhile to try reprogramming the fob yourself. In most cases, it is possible to find the instructions in your owner's guide. If you don't have the manual you can search for instructions online or on YouTube. It is important to consult the owner's manual before attempting any repairs on the key fob.