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Citroen C3 Key Fob Troubleshooting Citroen key fobs can stop working due to a variety of causes. Some of them include worn buttons and poor contact with the battery, water damage and receiver module issues. Make sure the batteries are 12 volts. Deprogramming may be the cause that your key fob isn't unlocking your car. This occurs when certain buttons send an electronic message to the computer asking that the key be removed from its list of keys. Dead coin battery If the fob that you use to open the door on your Citroen C3 is no longer working, check first if the battery is dead. The batteries in the fobs are small round coins that can be replaced in a matter of minutes. They are sold in general stores, home improvement stores, and auto parts stores. Make sure you buy the correct type, though. The majority of fobs require CR2025 or CR2032, but you should look through the owner's guide to determine the type of battery your vehicle requires. Remove the button pad, and then use cotton swabs or alcohol to clean it. This will remove any corrosion, and clean the contacts which typically have a gold color. Once the contacts have been cleaned, you are able to add the new battery. Be careful not to mix up the two types as they have different voltages, diameters and shapes. The next step is to check the battery's voltage. A multimeter set to the battery's voltage range will provide you with a precise reading. If the battery's voltage is higher or lower than the threshold, it needs to be replaced. You could also start your car with a spare keys. However, this may not always work. If the issue continues then visit a CITROEN dealer with your V5 registration document and personal identifi cation documents. A CITROEN Dealer can obtain the code of your vehicle's immobiliser, and then order an upgrade to your battery. Water damage If the key fob is submerged it may lose its signal. It's best to remove it as fast as you can out of the pool or puddle. Once you do dry the circuit board as best you can using a cotton swab that has been dipped in isopropyl alcohol or an electronic cleaner. If the circuit board is still not working it could be time to get a new key fob. Signal interference is a common cause of Citroen remote controls not working. This could happen if there is an electrical field close to the car or other transmitters on the same frequency. The key fob should start working once you leave the area of interference. The Citroen C3 key fob may stop working because of worn buttons, signal interference issues, receiver module problems or a dead 12-volt battery or a damaged chip. If this happens, you'll likely have to have it changed by a certified expert. This can be done by a trained mechanic or at an Citroen dealership. If the issue is severe it is possible to replace the device. It's a simple and affordable fix, but it's imperative to act swiftly. The longer you wait to fix the issue, the worse it becomes. If the issue isn't fixed the issue could be a hazard for passengers and you. Issue with the Receiver module If your key fob is not functioning the receiver module could have developed an issue. Water damage is one of the numerous causes. It can happen when you drop your keys, or wash them. You can fix the problem by removing and cleaning the chip with isopropyl alcohol or an electronic cleaner. This will avoid the chip from becoming damaged. You can also try to reset the receiver module by disconnecting it from the car battery and letting it sit for 10 seconds. Then, reconnect the battery to the vehicle and repeat the process. If this doesn't fix the problem, you can bring it to a dealer to be repaired. Interference can cause your key to stop working. It could be caused by other transmitters that utilize the same frequency as your key fob or by objects within your vehicle. If you're unable fix the issue, you can visit a dealer and have your key fob reprogrammed. The key fob contains a short-range radio transmitter/radio-frequency identification (RFID) chip and antenna, which sends a distinct coded signal to the receiver module in your car. If the signal doesn't match, the receiver module will not recognize the key and will display a key not detected message. This can be a frustrating problem especially when trying to start your car. citroen keyless entry is possible that your key fob is damaged if it stops working after a change of batteries. This is most likely to happen when the key fob been dropped or stepped upon However, it can be the result of a service that requires the removal of panels and the reinstallation. Wires become exposed when panels are removed. If your fob is damaged, it might need to be replaced entirely. Another possibility is that the fob may be receiving interference from other devices or places. This can cause RF signals to weaken and stop the car from acknowledging the remote. You can reset the on-board computer in this scenario by disconnecting your 12-volt battery for 15 minutes. This will clear any residual electricity and allow the system to start again. Before replacing the battery it's important to make sure it is the correct size and type. If the replacement battery is too small or has an incompatible voltage, it may damage the circuit board within the fob's key. Before installing a new battery, you must clean the chip of the fob to get rid of any corrosive substances. Using the right battery can help ensure that it is properly sealed and shielded from moisture. After the key fob has been put back in place, it should function normally. You can usually use the second key when your car displays a message that reads “key not detected.” You may have to press the button several times before it responds.