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Citroen C3 Key Fob Troubleshooting Citroen key fobs might stop working due to a variety of causes. Some of them include worn buttons and poor contact with the battery, water damage, and receiver module issues. You should also check the battery's 12 volts. Deprogramming is a possible cause of your key fob not 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 your Citroen C3's main fob is not working, the first thing to examine is whether the battery is dead. Fobs are small coin-shaped batteries which can be replaced in a few minutes. You can find these in general stores, home improvement stores, and even auto parts stores. Be sure to buy the correct kind. The majority of fobs require CR2025 or CR2032 However, you should consult your owner's manual to determine the exact kind of battery your vehicle requires. Before you replace the battery, remove the button pad and rub it using cotton swabs and alcohol. This will remove any corrosion, and clean the contacts that typically have a gold color. Once the contacts are cleaned and sanitized, you can then insert the new battery. Be careful not to mix the two types as they differ in voltage, sizes and diameters. Next, you will need to check the voltage of the battery. A multimeter that is set to the battery's voltage range should provide you with a precise reading. If the battery has a voltage that is higher or lower than its threshold, it needs to be replaced. Try getting your car started using a spare key, but it may not be effective in all cases. If the issue continues, go to an CITROEN dealership with your V5 registration and personal identity documents. A CITROEN dealer can locate the code for the immobiliser on your vehicle and purchase the replacement battery. Water damage When the key fob gets underwater, it may lose its signal to the car. If this occurs, it's a good idea to get it out of the puddle, pool or washing machine as quickly as possible. Once you do, dry out the circuit board as best you can with the help of a cotton swab, dipped into isopropyl alcohol or electronic cleaner. If it doesn't work It could be the time to replace your key fob. Another reason that can be cited one of the main reasons for Citroen remote control c3 not working is signal interference. This could happen if there is an electrical field near the car or other transmitters using the same frequency. When you leave the interference area the key fob will begin working again. The Citroen C3 key fob might not function because of worn buttons or signal interference issues, receiver module problems or a dead 12-volt battery or a malfunctioning chip. It will need to be replaced if this happens. This can be done either by a qualified mechanic or an Citroen dealer. If the issue is serious it may be necessary to replace it. It's a simple and cost-effective fix, however it's important to act quickly. The longer you delay to resolve the issue, the more severe it will be. If the issue doesn't get resolved it could pose a danger for passengers and you. Receiver Module Issue If your key fob stops working, it might be due to the receiver module having developed an issue. Water damage is one of the many causes. This could happen if you drop 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 also try to reset the receiver module by disconnecting it from the car battery and letting it sit for 10 minutes. Then, reconnect the battery to the car and repeat the process. If this doesn't solve the issue, go to a dealer to have it replaced. Interference can also cause your key to stop working. It can be caused by other transmitters using the same frequency, or by objects in your vehicle. If you're not able to fix the issue, you can bring your key fob to a 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 citroen xsara picasso key fob replacement doesn't match the receiver module won't recognize the key and display an error message that states the key is not detected. This is a problem that can be frustrating especially when you attempt to start your vehicle. Dead 12 volt battery It is possible that your key fob is damaged if it ceases to function after a change in batteries. This is especially true when the key fob has been dropped or stepped on. However, it could also occur following maintenance on your vehicle that requires removal and reinstallation of panels. When these panels are removed, the wires are exposed. If your fob has been damaged, it may require replacement. A fob that is receiving interference from other devices or locations is a second possibility. This can make the RF signals weaker and block the car from recognizing the remote. If this happens you can reset the on-board computers by disconnection of the 12 volt battery for about 15 minutes. This will erase any remaining power and allow the system to begin over. Before replacing the battery, it's important to make sure it's of the correct type and size. If the replacement battery is too small or has an unsuitable voltage, it could damage the circuit board inside the fob's key. Before installing a new battery, you should clean the chip inside the fob to eliminate any contaminants that could cause corrosion. Using the correct type of battery can help ensure that it is sealed and protected from moisture. After the key fob has been replaced, it should work normally. It is usually possible to use the second key even in the event that your vehicle displays a message saying “key not found.” You may need to press the button several times before it responds.