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Citroen C3 Key Fob Replacement If your C3 key fob suddenly stopped working, it could be because of a faulty module. If the key fob operates it could be due to another issue, such as water damage or a dead battery. Citroen is aiming to reach the mass market by offering eC3. It offers several facilities such as remote diagnostics through virtual computers and a dedicated customer support application. Dead coin battery If the unlock button on the key fob isn't working, or if the unlock button does not work, it could mean that the battery inside the coin is faulty. Battery life should range between three and four years with regular use. However, it is possible for it to abruptly die. Luckily, car makers have built-in fail-safes that ensure you are able to start and lock your car even if your key fob has a dead battery. The battery in the key fob is normally secured by metal clips that form the circuit. The battery might not be charged if the clips are dirty or worn. The battery must be of the correct size and type. The battery will not fit into the fob if it's too big or too small. Key fob batteries are sold under a variety of names, including CR2016 and even CR2032. These are not interchangeable. The best way to determine which type to purchase is to check the owner's manual or look at the fob for an inscription which provides you with the precise information. If you've got the right battery, you can replace it within a couple of minutes. Most fobs have a slider switch, or gap that you can use to pry open the cover and swap the old battery to get the new one. Make sure that the new battery is of 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 destroy the battery and cause severe damage to the electronic chip inside. Fortunately, there are some actions you can take to limit the damage. It's crucial to first eliminate the battery, and then dry the inside as much as you can. You can also clean the battery by using a cotton swab that has been dipped into 90-percent alcohol. After you've cleaned the key fob, wait a few days for it to completely dry. You can accelerate the process by placing it on a shelf that isn't disturbed. Once you're sure that it's bone dry, try putting in a new battery and use it as usual. If the key fob still isn't working, it could have a problem with the receiver module that's not transmitting signals to your vehicle. It's expensive to repair, but worth it if you don't wish to replace your vehicle. The simplest method to fix a damaged key fob is to replace the battery. The radio signal should be restored and your key fob should function again after replacing the battery. However, if the problem persists you should seek professional help. Faulty receiver module In certain situations, the key fob's receiver module could be defective that is preventing it from receiving or transmitting the correct signal. In this situation the car won't recognize the remote control key. It will not unlock or start. In this scenario you'll have to purchase a new one. Read the owner's manual before trying to modify the key fob by yourself. First, check that the key fob's battery is in good condition and that all buttons are functioning. 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 using isopropyl alcohol, or an electronic cleaner. If the chip is fried, you will need to replace it. After cleaning the key fob, remove the circuit board. Then, citroen c1 remote programming to clean the contacts and let them air dry. After the contacts have dried you can reassemble your key fob and test it. If the key fob isn't working, it may be necessary to replace the battery. Be sure to choose the new battery with the same voltage as the old one. It is recommended to make sure the battery is placed in the correct position and that the contact points can be extremely sensitive. Keyless entry system malfunctions It can be quite frustrating If the key fob ceases functioning. The good news is that most times, it's easy to get it back in operation. A dead coin battery is the most frequent cause of a malfunctioning fob. This can be easily repaired in just a few minutes. Other reasons include signal interference, malfunctioning receiver modules, and other electrical problems. The first step is to make sure that the battery is running at the correct voltage and has been properly placed. The correct type of battery is also important. Using a wrongly sized, or polarized battery could damage the internal circuitry. You can also check the fuses to ensure they aren't blown out or melted. Another possibility is that the transponder in the key might have been damaged or destroyed. This will require a further investigation by a qualified mechanic or car dealer. Auto locksmiths and dealers will reprogram the key fob on a vehicle for a fee. However this can be expensive. It may be worth it to reprogram your spare fob if you own one. It is possible to find instructions in the owner's manual. If you don't own the manual, you can find instructions online or on YouTube. Before attempting to fix the key fob, it's crucial to consult the owner's manual.