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Citroen C3 Key Fob Troubleshooting The key fob of the Citroen C3 can stop working due to a variety of reasons. Some of them include worn buttons, poor contact with the battery, water damage, and receiver module issues. Check visit link . Deprogramming may be the cause the key fob's not unlocking your car. This happens 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 your C3's keys fob is not working the first thing to look for is if the battery is dead. The batteries in the fobs are tiny, 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. Be sure to purchase the correct type, though. For fobs, batteries are typically CR2025 or CR2032 However you should refer to the owner's manual of your vehicle to determine which kind of battery is needed. Remove the button pad and then use cotton swabs or alcohol to clean it. This will remove any corrosion, and clean the contacts that are typically gold-colored. After the contacts have been cleaned, it is now time to add the new battery. Be careful not to mix the two types as they have different voltages and diameters. The next step is to determine the voltage of the battery. You can obtain a precise reading with a multimeter that is calibrated to the battery's voltage range. If the battery's reading is above or below threshold, it should be replaced. Try starting your car with a spare key, but this may not work in all cases. If the issue continues then visit a CITROEN dealer with your V5 registration form and personal identifi cation documents. A CITROEN dealer can retrieve the code for your vehicle's immobiliser system and get the replacement battery. Water damage If the key fob falls under water, it could lose its signal to the car. It's best to remove it as fast as you can out of the pool or puddle. Once you've done that, use a cotton swab, isopropyl or electronic cleaner to dry the circuit board. If the key fob still does not work, it may be time to purchase a new one. Signal interference is another common reason for Citroen remote controls not working. This may occur when there is a strong electrical field near the vehicle or from other transmitters operating on the same frequency. The key fob will begin working once you have left the zone of interference. Additionally, the Citroen C3 key fob may not function due to worn buttons, signal interference, receiver module issues or a dead 12 Volt battery, or a malfunctioning electronic chip. You'll need to have it changed to a new program if this happens. This can be accomplished by a qualified mechanic or at a Citroen dealership. If the issue is severe, you may need to replace it. This is a relatively simple and affordable fix, but it's imperative to act swiftly. The longer you delay fixing the issue, the worse it gets. It could pose a risk to you and your passengers If the issue isn't fixed. Receiver Module Issue If your key fob is not functioning, the receiver module may have developed an issue. Water damage is one of the numerous reasons. It can happen when you lose your keys or wash them. You can try to repair the issue by removing the chip and cleaning it with isopropyl, or electronic cleaner. This will stop the chip from corrosion. You can reset the receiver module if you disconnect it from the battery for 10 seconds. Then, reconnect the battery to the vehicle and repeat the process. If this does not fix the issue, take it to a dealership to be repaired. Another reason why your key might stop working is due interference. It can be caused by other transmitters that operate on the same frequency or by objects in your vehicle. If you are unable fix the issue, take your key fob in to a dealer and have it changed to a different frequency. 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 in order the receiver module will not recognize the key and will display a key not detected message. This is a problem that can be frustrating particularly when trying to start your car. Dead 12 volt battery It is possible that your key fob has been damaged if it ceases to function after the change of batteries. This is most likely to happen in the event that the key fob was dropped or stepped upon, but it also can occur after service on your car which requires the removal and reinstallation of panels. When these panels are removed, wires are exposed. If your fob has been damaged, it might need to be replaced entirely. A remote that receives interference from other devices and locations is another possibility. This can make RF signals weaker and block the car from recognizing the remote. You can reset the on-board computer in this situation. You can do this by disconnecting the 12-volt battery for 15 minutes. This will erase any remaining power, allowing the system to restart. It is essential to verify the size and quality of the battery prior to replacing it. If the battery you replace isn't big enough or has an incompatible voltage, it may damage the circuit board within the fob's key. Before installing a battery, you must clean the chip inside the fob to remove any contaminants that could cause corrosion. The correct type of battery can ensure that the key fob is sealed and protected from moisture. Once the key fob has been reinstalled it should function normally. In the majority of instances, you will be able to use the second key to start your vehicle even when it displays a message of “key not detected.” It is possible to press the button several times before it responds.