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Citroen C3 Key Fob Troubleshooting Key fobs from Citroen can stop working due to a variety of causes. This includes worn buttons, poor contact with the battery, water damage, and receiver module issues. Check the 12 volt battery. If the key fob does not unlock your car, you might be experiencing deprogramming. This happens 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 the fob that you use to open the door on your Citroen C3 is no longer working, first make sure the battery has gone out. The batteries that are in the fobs are tiny, round coins that can be replaced in just a few minutes. They are sold in general stores, home improvement stores and auto parts stores. Make sure you purchase the correct battery, however. Batteries for fobs 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. Before you replace the battery, take off the button pad and rub it with cotton swabs and alcohol. This will help remove corrosion and clean the contacts which are usually gold colored. Once the contacts are cleaned it is time to insert the new battery. Be careful not to mix the two kinds because they have different voltages and sizes. The next step is to examine the battery's voltage. You can obtain a precise reading using a multimeter which is set to the battery's voltage range. If the battery's value is either above or below the threshold, then it must be replaced. You could also try starting your car with an extra key, but this might not be successful in all instances. If the problem persists you should visit a CITROEN dealer with your V5 registration form and personal identification documents. A CITROEN Dealer can locate the code for the immobiliser on your vehicle and purchase an upgrade to your battery. Water damage If the key fob is submerged, it could lose its signal. It is recommended to remove it as fast as you can from the puddle or pool. Once you have done that dry the circuit board in the best way you can with a cotton swab that has been dipped in isopropyl alcohol or an electronic cleaner. If it doesn't work It could be time to get a new key fob. Another common reason the most common reason for Citroen remote control c3 not working is signal interference. This can happen when there is an electrical field close to the car or other transmitters using the same frequency. The key fob should begin to work again once you have left the area of interference. The Citroen c3 key fob can cease to function due to worn buttons and receivers, signal interference, module issues or a dead 12 volt battery, or a malfunctioning electronic chip. If this happens, you'll probably have to have it replaced by a skilled technician. This can be done by a skilled mechanic or at a Citroen dealership. If the issue is significant the vehicle will need to be it replaced. This is a simple and inexpensive fix, but it's crucial to act fast. The longer you delay to correct the issue the more severe it will be. If the issue isn't resolved it could be a risk for passengers and you. Receiver Module Issue If your key fob is not functioning the receiver module could have developed a fault. This could be due to several things, including water damage. It can happen when you lose your keys, or wash them. You can attempt to solve the issue by removing and cleaning the chip with isopropyl alcohol, or electronic cleaner. This will stop the chip from corroding. You can also reset the receiver module when you disconnect it from the battery, and wait 10 seconds. You can then reconnect the battery and repeat the procedure. If this isn't enough to fix the issue, take it to a retailer for replacement. Another reason why your key might stop working is due to interference. It could be caused by other transmitters operating on the same frequency or objects inside your vehicle. If you're unable to solve the issue, you can bring your key fob 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 module won't recognize the key and display the message “Key not detected. This could be a very frustrating issue, particularly when trying to start your car. Dead 12 volt battery If your key fob ceases working after a battery change It could be damaged. This is more frequent when the key fob been dropped or stepped upon However, it can happen after a service that requires the removal of panels and then reinstallation. When the panels are removed, the wires are exposed. If your fob is damaged, you might have to replace it completely. Another possibility is that the fob may be receiving interference from other devices or places. This can cause RF signals to become weaker and block the car's recognition of the remote. It is possible to reset the onboard computer if this is the situation. You can do this by disconnecting the 12-volt battery for 15 minutes. This will erase any remaining electric current, allowing your system to restart. citroen berlingo replacement key is essential to confirm the size and type of the battery prior to replacing it. If the battery you replace is too small or has a different voltage, it could damage the circuit board in the key fob. You should also remove any corrosive materials off the chip in the fob prior to installing a new battery. The proper type of battery will ensure that the key fob is sealed and protected against moisture. After the key fob has been reinstalled, it should function normally. In most instances, you will be able to use the second key to start your car even when it displays a message saying “key not detected.” It is possible to press the button a few times before it responds.