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Citroen C3 Key Fob Troubleshooting The Citroen c3 keyfob may cease to function due to different reasons. This includes worn buttons, poor battery contact, water damage and receiver module issues. You should also check the 12 volt battery. If the key fob does not unlock your car, it could be experiencing deprogramming. This occurs when certain buttons send an indication to the onboard computer to erase the key from its list of access. Dead coin battery If your Citroen C3's key fob no longer works the first thing to determine is if the battery is dead. The batteries in the fobs are small, round coins that can be easily replaced within a few moments. These can be found in general stores, home improvements stores and auto parts stores. Make sure you purchase the correct type. Fobs usually require CR2025 or CR2032, but you should check the owner's manual to determine the exact type of battery that your car requires. Remove the button pad and then use cotton swabs or alcohol to clean it. This will help remove corrosion, and clean the contacts that are typically gold-colored. After the contacts have been cleaned, you can then add the new battery. Be careful not to mix the two types because they differ in their voltages and diameters. The next step is to check the battery's voltage. A multimeter calibrated to the battery's voltage range should provide a precise reading. If the battery's value is higher or lower than the threshold, then it must be replaced. Try starting your car with an extra key, but it may not work in all cases. If the problem persists then visit an CITROEN dealer with your V5 registration form and personal identifi cation documents. A CITROEN dealer can find the code for your vehicle's immobiliser and order an upgrade to your battery. Water damage If the key fob is submerged it may lose its signal. If this happens, it's a great idea to get it out of the pool, puddle, or washing machine as fast as possible. After that, dry out the circuit board in the best way you can with an abrasive swab of cotton that's been soaked in isopropyl alcohol or electronic cleaner. If the key fob still isn't working, it may be time to get another one. Signal interference is a different reason for Citroen remote controls not working. This can occur when there is an electrical field near the vehicle or other transmitters operating on the same frequency. When you leave the interference area your key fob should begin working again. Finally, the Citroen C3 key fob may cease to function due to worn buttons or signal interference, receiver module issues or a dead 12 volt battery, or a damaged electronic chip. If this happens, you'll probably require it to be reset by a professional. This can be done by a trained mechanic or a Citroen dealer. If the problem is serious it may be necessary to replace the device. This is a fairly easy and inexpensive fix, but it's important to act quickly. The longer you wait to fix the issue, the more deteriorated it becomes. If the issue isn't resolved it could be a risk for you and your passengers. Issue with the Receiver module If your key fob is not working it could be because the receiver module might have developed a fault. Water damage is one of the many causes. This could happen if you drop your keys or wash them. You can fix the problem by taking off the chip and cleaning it with isopropyl, or electronic cleaner. This will keep the chip from becoming corroded. You can also reset the receiver module if you disconnect it from the battery and wait 10 seconds. Then, reconnect the battery and repeat the process. If this fails to fix the issue, you can go to a dealer to have it replaced. Another reason your key could stop working is due interference. This could be caused by other transmitters using the same frequency as your key fob or by objects inside your vehicle. If you are unable fix the issue, take your key fob to a dealer to be replaced. 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 telling you “key not recognized”. This can be a frustrating problem especially when you attempt to start your car. Dead 12 volt battery If your key fob ceases working after changing the battery it could be damaged. This is most likely to happen if your key fob has been dropped or stepped over however, it can also occur after a service that requires the removal of panels and reinstallation. Wires become exposed when panels are removed. If your fob is damaged, you may require replacement completely. Another possibility is that the remote receives interference from other devices or places. This can make the RF signals weaker and hinder the car from recognizing the remote. citroen key clip can reset the onboard computer if this is the situation. You can do this by disconnecting the 12-volt battery for 15 minutes. This will remove any residual electricity, allowing the system to restart. It is essential to verify the size and type of the battery prior to replacing it. The circuit board on the key fob can be damaged if the replacement battery is too large or has a different voltage. It is also recommended to clean any corrosive materials from the chip in the fob before installing the new battery. The correct type of battery can ensure that the key fob is sealed and protected against moisture. Once the key fob's been reinstalled, it should function normally. You can usually use the second key even the car displays a message saying “key not detected.” You may need to press the button a few times before it responds.