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Citroen C3 Key Fob Troubleshooting Citroen key fobs might malfunction due to a variety of causes. The most common reasons are worn buttons, poor contact with the battery, water damage and receiver module problems. Also, you should check the battery's 12 volts. Deprogramming may be the cause the key fob's not unlocking your car. This happens when certain button combinations send an alert to the onboard computer requesting that the key be removed from its list of keys. Dead coin battery If your Citroen C3's key fob is not working, the first thing to look for is if the battery is dead. Fobs use small, coin-shaped batteries that can be replaced in just a few minutes. You can find these at home improvement stores, and some auto parts stores. Be sure to buy the correct type. Fobs typically require CR2025 or CR2032, but you should look through the owner's guide to determine the type of battery your vehicle requires. Before you replace the battery, remove the button pad and rub it using cotton swabs and alcohol. These will help remove corrosion and clean the contacts which are typically colored gold. Once the contacts have been cleaned, you can insert the new battery. Be careful not to mix the two kinds as they have different voltages, sizes and diameters. The next step is to test the battery's voltage. You can get a precise reading with a multimeter that is set to the battery voltage range. If the battery has the value that is either above or below its threshold, it has to be replaced. You can also start your vehicle with a spare key. However, this may not always work. If the issue continues, go to a CITROEN dealership with your V5 registration as well as personal identification documents. A CITROEN dealer can locate the code for the immobiliser on your vehicle and request the replacement battery. Water damage If the key fob is submerged, it could lose its signal to the car. If this occurs, it's a good idea to fish it out of the puddle, pool or washing machine as soon as you can. After this make use of an swab of cotton and 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. Another reason that is commonly cited that can be the reason behind Citroen remote control c3 not working is signal interference. It can happen when there is a strong electrical field in the vicinity of the vehicle, or from other transmitters operating on the same frequency. When you leave the interference area, your key fob will be working normally again. citroen key remote might cease to function due to worn buttons or signal interference issues, receiver module problems as well as a dead 12-volt battery or a malfunctioning chip. You'll need it reset if this happens. This can be done by a trained mechanic or at a Citroen dealership. If the issue is severe, you'll need to have it replaced. This is a simple and inexpensive fix, but it's crucial to act fast. The longer you put off taking action to correct the issue the worse it will become. It could be dangerous for passengers and you when the issue is not addressed. Receiver Module Issue If your key fob is not working, the receiver module may have developed an issue. This could be due to many things, including water damage. It can happen when you lose your keys, or wash them. You can try to solve the issue by removing and cleaning the chip using isopropyl alcohol or electronic cleaner. This will prevent corrosion of the chip. You can also reset the receiver module when you disconnect it from the battery and then wait 10 seconds. You can then reconnect the battery and repeat the process. If this does not fix the issue, take it to a dealership to have it replaced. Interference can cause your key to stop working. It could be caused by other transmitters that operate on the same frequency, or by objects inside your vehicle. If you're unable to fix the issue, go to a dealer to get 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 isn't correct it will not recognize the car key and display a message saying “key not recognized”. 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 has been damaged if it stops working after a change of batteries. This is more likely when the key fob been dropped or stepped upon or stepped on, but it could also be the result of a service that requires the removal of panels and reinstallation. When the panels are removed, wires are exposed. If your fob is damaged, you may need to replace it completely. Another possibility is that the fob receives interference from other devices or locations. This can cause RF signals to become less effective and hinder the car from being able to recognize the remote. You can reset the onboard computer in this situation by disconnecting the 12-volt battery for 15 minutes. This will eliminate any remaining electricity, allowing the system to reboot. It is important to check the size and type of the battery before replacing it. The circuit board in the fob's circuit board could be damaged in the event that the replacement battery is too big or has different voltage. Before installing a battery, you should clean the chip inside the fob to eliminate any corrosive substances. The correct type of battery can ensure that the key fob is sealed and protected from moisture. After the key fob has been installed, it will function normally. In the majority of instances, you can use the second key to start your car even in the event that it displays a message saying “key not found.” It could be necessary to press the button a few times before it responds.