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Citroen C3 Key Fob Troubleshooting The key fob of the Citroen C3 can cease to function due to many reasons. Some of these include worn buttons or poor contact with the battery, water damage, and receiver module issues. Also, you should check the battery's 12 volts. Deprogramming could be the cause that your key fob isn't unlocking your car. This occurs when certain button combinations send an electronic message to the computer, asking that the key be removed from its list of keys. Dead coin battery If the key fob on your Citroen C3 is no longer working, first determine if the battery has failed. The batteries inside the fobs are small round coins that can be changed in a matter of seconds. They can be found in general stores, home improvements stores, and auto parts stores. Make sure you buy the correct model, however. The batteries for fobs are usually CR2025 or CR2032, however you must consult the owner's manual for your vehicle to determine what type is required. Take off the button pad and use cotton swabs and alcohol to clean it. This will help to remove corrosion and clean the contacts which are typically colored gold. Once the contacts have been cleaned, you can install the new battery. Be careful not to mix the two batteries because they have different diameters and voltages. The next step is to determine the voltage of the battery. A multimeter calibrated to the battery's voltage range should give you a reliable reading. If the battery's voltage is above or below threshold, then it needs to be replaced. You can also start your vehicle by using a spare key. However, this may not always work. If the issue persists go to a CITROEN dealer with your V5 registration certificate and personal identifi cation documents. A CITROEN Dealer can obtain the code of the immobiliser on your vehicle and purchase the replacement battery. Water damage If the key fob is submerged, it could lose its signal. If this occurs, it's a good idea to remove it of the pool, puddle or washing machine as fast as possible. Once you do dry the circuit board as best you can using a cotton swab dipped in isopropyl ethanol or electronic cleaner. If the key fob isn't working, it may be time to invest in an entirely new one. Another common reason the most common reason for Citroen c3 remote control not working is signal interference. This can occur when there is an intense electrical field close to the car, or from other transmitters operating on the same frequency. Once you have left the area of interference your key fob will restart working. Lastly, the Citroen C3 key fob could cease to function due to worn buttons, signal interference, receiver module issues or a dead 12 Volt battery, or a malfunctioning electronic chip. If this happens, you'll probably need to get it changed by a certified expert. This can be accomplished by a qualified mechanic or at an Citroen dealership. If the issue is significant, you may need to replace the device. It's an easy and inexpensive fix. But you must take action quickly. If you put off fixing the problem, the worse it gets. If the problem isn't addressed it could pose a danger for the passengers and yourself. Receiver Module Issue If your key fob is not working it could be because the receiver module might have developed a fault. This could be due to several things such as water damage. This can happen when you drop your keys or wash them. You can try to solve the problem by removing your chip and cleaning it with isopropyl or an electronic cleaner. This will avoid the chip from becoming damaged. You can reset the receiver module if you disconnect it from the battery and wait 10 seconds. Then, reconnect the battery and repeat the procedure. If this does not resolve the problem, you can bring it to a dealer to have it replaced. Another reason why your key might be unable to function is due interference. It could be caused due to other transmitters using the same frequency as your key fob or by objects inside your vehicle. If you're not able to fix the issue, visit a dealer to 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 is not accurate the receiver will not recognize the car key and display a message saying “key not detected”. This can be a frustrating issue, especially when trying to start your car. Dead 12 volt battery It is possible that the key fob you have purchased has been damaged if it stops working after the change of batteries. This is particularly true in the event that the key fob was dropped or stepped on, but it also can occur after maintenance on your vehicle that requires removal and reinstallation of the panels. When citroen dispatch key fob www.thekeylab.co.uk are removed, wires are exposed. If your fob has been damaged, it may need to be replaced entirely. A fob that is receiving interference from other devices and locations is another possibility. The RF signals can cause to become weak and prevent the car from understanding the remote. If this happens, you can reset all on-board computers by disconnection of the battery at 12 volts for around 15 minutes. This will clear any residual power and let the system start over. It is crucial to determine the size and quality of the battery prior to replacing it. If the battery you replace is too small or has an incompatible voltage, it could harm the circuit board inside the fob's key. It is also recommended to clean any corrosive substances from the chip inside the fob before installing the new battery. Using the correct type of battery will ensure that it is properly sealed and protected from moisture. Once the key fob's been reinstalled, it should function normally. You should be able to use the second key even if your car displays a message that says “key not detected.” It could be necessary to press the button multiple times before it responds.