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Citroen C3 Key Fob Troubleshooting Key fobs from Citroen can stop working due to a variety of causes. These include worn buttons poor contact between the battery and the water, and receiver module issues. Also, you should check the battery's 12 volts. Deprogramming could be the cause the key fob's not unlocking your car. This occurs when certain button combinations send a message to the onboard computer asking that the key be removed from its list of keys. Dead coin battery If your Citroen C3's main fob has stopped working the first thing to check is if the battery is dead. The batteries that are in the fobs are small, round coins that can be easily changed in a matter of seconds. You can find these at general stores, home improvement stores, and a few auto parts stores. Be sure to purchase the correct one, however. Batteries for fobs are typically CR2025 or CR2032 However you should check the owner's manual of your vehicle to determine what type is required. Remove the button pad, and use cotton swabs and alcohol to clean it. They will remove the corrosion, and clean the contacts which are usually gold colored. Once the contacts have been cleaned, it is now time to insert the new battery. Be cautious not to mix the two types since they differ in voltage, diameters and shapes. The next step is to determine the voltage of the battery. You can get an accurate reading using a multimeter which is set to the battery's voltage range. If the battery's reading is above or below threshold, it should be replaced. You could also try the car's start using an extra key, but this might not be successful in all instances. If the issue persists then visit a CITROEN dealer with your V5 registration document and personal identification documents. A CITROEN Dealer can obtain the code for the immobiliser on your vehicle and purchase a new battery. Water damage If the key fob is underwater it may lose its signal to the car. If this happens, it's a good idea to get it out of the pool, puddle, or washing machine as soon as possible. After this then use a cotton swab, isopropyl or electronic cleaner to dry the circuit board. If the key fob isn't working, it may be time to invest in an entirely new one. Another reason that is commonly cited one of the main reasons for Citroen remote control c3 not working is signal interference. This could happen if there is an electrical signal near the car or other transmitters operating on the same frequency. When you leave the interference area your key fob will begin working again. The Citroen C3 key fob might cease to function due to worn buttons and receivers, signal interference, module issues, a dead 12 volt battery, or an indefective electronic chip. citroen car key cutting 'll need it reset if this happens. This can be done by a skilled mechanic or at an Citroen dealership. If the issue is serious it may be necessary to replace the device. It's a fairly simple and inexpensive fix. But you should get it done quickly. The longer you put off fixing the issue, the more serious it becomes. It could pose a risk to passengers and yourself If the issue isn't addressed. Receiver module issue If your key fob is not functioning it could be because the receiver module might have developed an issue. It could be caused by various factors such as water damage. This can occur when you accidentally drop your keys or wash them. You can repair the issue by removing the chip and cleaning it with isopropyl, or electronic cleaner. This will stop the chip from becoming corroded. You can also reset the receiver module by disconnecting it from the car battery and then waiting for 10 seconds. Then reconnect the battery to the vehicle and repeat the process. If this fails to fix the issue, you can visit a dealership to have it replaced. Another reason why your key could be unable to function is due interference. It could be caused by other transmitters using the same frequency as your key fob, or even objects in your vehicle. If you're unable fix the issue, visit a dealer to change the key fob's programming. 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 right the receiver module will not recognize the key and display a message that says “Key Not Detected. This could be a very frustrating issue, especially when trying to start your vehicle. Dead 12 volt battery It is possible that your key fob has been damaged if it ceases to function after a change of batteries. This is particularly true in the event that the key fob was dropped or stepped upon, but it can also happen following service on your car that requires removal and reinstallation of the panels. Wires are exposed as panels are removed. If your fob is damaged, you might require replacement completely. Another possibility is that the remote receives interference from other devices or locations. This could make RF signals weaker and block the car's recognition of the remote. If this happens you can reset all computer systems on board by disconnecting the battery at 12 volts for around 15 minutes. This will remove any remaining power and allow the system to start from scratch. It is important to check the size and type of the battery before replacing it. If the battery you replace is too small or has an unsuitable voltage, it could damage the circuit board inside the key fob. Before you install a battery you should clean the chip of the fob in order to eliminate any corrosive substances. The right battery type can ensure that the key fob is sealed and protected against moisture. After the key fob has been reinstalled, it should work normal. In most instances, you will be able to use the second key to start your car, even if it shows the message “key is not detected.” It is possible to press the button several times before it responds.