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Citroen C3 Key Fob Troubleshooting Citroen key fobs can malfunction due to a variety of causes. There are a variety of reasons, including worn buttons and poor contact with the battery, water damage, and receiver module issues. Also, you should check the 12 volt battery. If your key fob does not unlock your car, you may be experiencing deprogramming. This occurs when certain buttons send an email to the onboard computer, asking that the key be removed from its list of keys. Dead coin battery If your Citroen C3's key fob has stopped working, the first thing to check is if the battery is dead. The batteries contained in the fobs are small, round coins that can be easily changed in a matter of seconds. They can be found in general stores, home improvements stores, and auto parts stores. Be sure to buy the correct model. Batteries for fobs are usually CR2025 or CR2032 However, you should consult the owner's manual of your vehicle to determine what type is required. Before you replace the battery, remove the button pad and rub it with cotton swabs and alcohol. This will remove any corrosion, and clean the contacts, which are usually gold-colored. Once the contacts have been cleaned, it is now time to insert the new battery. Be careful not to mix the two types as they have different voltages, dimensions, and shapes. The next step is to test the battery's voltage. You can get a precise reading using a multimeter which is calibrated to the battery's 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 car with a spare keys. However, this may not always work. If the issue continues go to an CITROEN dealer with your V5 registration certificate and personal identification documents. A CITROEN dealer will be able to retrieve the code for your vehicle's immobiliser system, and order a 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 from the pool, puddle, or washing machine as fast as you can. Once you've done that, use the cotton swab along with isopropyl or electronic cleaner to dry the circuit board. If the circuit board is still not working then it's the time to replace your key fob. Signal interference is a different reason for Citroen remote control not working. This can happen when there is an electrical signal near the vehicle or other transmitters using the same frequency. When you leave the area of interference your key fob should be working normally again. Additionally, the Citroen c3 key fob can not function due to worn buttons signals, signal interference, receiver module issues or a dead 12 volt battery, or an indefective electronic chip. It will need to be reset when this happens. This can be done either by a trained mechanic or an Citroen dealer. If the issue is significant, you'll need to have it replaced. This is a relatively simple and inexpensive fix, but it's important to act quickly. The longer you wait to fix the problem, the worse it gets. If the issue isn't resolved, it can be dangerous for passengers and you. Receiver module issue If your key fob stops functioning, it could be due to the receiver module having developed a fault. Water damage is one of the numerous causes. It can happen when you drop your keys or wash them. It is possible to solve the issue by removing and cleaning the chip using isopropyl ethanol or electronic cleaner. This will avoid the chip from becoming damaged. You can also try to reset the receiver module by disconnecting it from the car battery, and waiting for 10 minutes. Then, reconnect the battery to the car and repeat the process. If this doesn't fix the issue, you can visit a dealership to have it replaced. Another reason why your key might stop working is due interference. This can be caused by other transmitters that operate on the same frequency as your key fob, or even objects in your vehicle. If you're unable fix the issue, you can go to a dealership 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 right the receiver will not recognize the car key and display a message stating “key not detected”. This could be a frustrating issue, especially if you're trying to start your car. Dead 12 volt battery If your key fob ceases working after the battery has been changed the device could be damaged. This is especially common when the key fob has been dropped or stepped on, however it could also occur following servicing on your car that requires removal and reinstallation of the panels. When these panels are removed, wires are exposed. If your fob is damaged, you might need to replace it completely. A remote that receives interference from other devices and locations is another possibility. The RF signals can cause to weaken and stop the car from recognizing the remote. If this happens, you can reset all computer systems on board by disconnecting the battery that is 12 volts for around 15 minutes. This will remove any residual electricity, allowing the system to reboot. It is essential to confirm the size and type of the battery before replacing it. If the replacement battery isn't big enough or has an incompatible voltage, it can damage the circuit board within the key fob. Before installing a battery you should clean the chip inside the fob to eliminate any contaminants that could cause corrosion. Using the right type of battery will ensure that it is properly sealed and protected from moisture. After citroen berlingo key fob The Key Lab has been put back in place, it should function normally. It is possible to use the second key if your car displays a message that reads “key not detected.” You may have to press the button several times before it responds.