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Citroen C3 Key Fob Troubleshooting Key fobs from Citroen can malfunction due to a number of causes. Some of these include worn buttons or poor contact with the battery, water damage and receiver module issues. Also, you should check the 12 volt battery. If the key fob will not unlock your car, you might be experiencing deprogramming. This occurs when certain button actions send a signal to the computer onboard to remove the key from its access list. Dead coin battery If the fob that you use to open the door on your Citroen C3 is no longer functioning, first check if the battery is dead. The batteries that are in the fobs are small, round coins that can be replaced in just a few minutes. They can be found in general stores, home improvements stores and auto parts stores. Make sure you purchase the right type. The majority of fobs require CR2025 or CR2032, but you should look through the owner's guide to find out the specific kind of battery your vehicle requires. Remove the button pad and use cotton swabs and alcohol to clean it. This will remove any corrosion and clean the contacts which typically have a gold color. After cleaning the contacts and sanitized, you can then insert the new battery. Be careful not to mix up the two types as they differ in voltage, dimensions and shapes. The next step is to test the battery's voltage. You can get a reliable reading using a multimeter, which is calibrated to the battery's voltage range. If the battery shows a value above or below its threshold, it will need to be replaced. Try the car's start using an extra key, but this may not be effective in all cases. If the issue continues then visit a CITROEN dealer with your V5 registration document and personal identification documents. A CITROEN Dealer can retrieve the code for your vehicle's immobiliser, and then order a new battery. Water damage When the key fob goes underwater, it may lose its signal to the car. If this occurs, it's a good idea to get it out of the puddle, pool, or washing machine as quickly as you can. Once you've done that, use a cotton swab and isopropyl or electronic cleaner to dry the circuit board. If the key fob still isn't working, it may be time to get another one. Another reason that can be cited for Citroen c3 remote control not working is signal interference. This may occur when there is a strong electrical field close to the car or from other transmitters operating on the same frequency. The key fob is expected to begin to function again after you leave the area of interference. The Citroen C3 key fob might not function because of worn buttons or signal interference issues, receiver module problems as well as a dead 12-volt battery or a defective chip. If this happens, you'll probably need to get it reprogrammed by an expert. This can be done by a certified mechanic or an Citroen dealer. If the issue is significant then you'll have to get it replaced. It's a simple and inexpensive fix. But Full File must get it done quickly. The longer you wait to fix the issue, the worse it becomes. It could pose a risk to passengers and yourself when the issue is not solved. Receiver module issue If your key fob ceases working, it could be due to the receiver module having developed an issue. Water damage is one of the numerous causes. This could happen if you lose your keys or wash them. You can try to fix it by removing the chip and cleaning it with isopropyl and electronic cleaner. This will prevent corrosion of the chip. You can also try to reset the receiver module by disconnecting it from the car battery and waiting for 10 seconds. Then, reconnect the battery to the vehicle and repeat the process. If this does not resolve the issue, take it to a dealer to have it replaced. Interference can cause your key to stop working. It can be caused by other transmitters on the same frequency, or by objects in your vehicle. If you're unable to fix the issue, you can take your key fob in to an authorized dealer and have it reset. 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 isn't correct, the receiver will not recognize the car key and display a message stating “key not recognized”. This can be a frustrating issue, particularly when trying to start your car. Dead 12 volt battery If your key fob stops working after an upgrade to a battery the device could be damaged. This is especially true if the key fob was dropped or stepped on. However, it could also occur following service on your car which requires the removal and reinstallation of the panels. When these panels are removed, the wires are exposed. If your fob is damaged, it might need to be replaced entirely. A remote that receives interference from other devices and locations is a different possibility. This can make the RF signals weaker and block the car from recognizing the remote. If this happens you can reset the computer systems on board by disconnecting the battery at 12 volts for approximately 15 minutes. This will eliminate any remaining electricity, allowing the system to restart. It is essential to confirm the size and quality of the battery prior to replacing it. The circuit board inside the fob's key could be damaged in the event that the replacement battery is too big or has an unrelated voltage. Before installing a new battery, you must clean the chip of the fob to get rid of any contaminants that could cause corrosion. Using the right type of battery will ensure that it is properly sealed and shielded from moisture. Once the key fob's been reinstalled, it should function normally. You should be able to use the second key the car displays a message that reads “key not detected.” It is possible to press the button multiple times before it responds.