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Citroen C3 Key Fob Troubleshooting Citroen c3 key fobs can not function for different reasons. The most common reasons are worn buttons and poor contact with the battery, water damage and receiver module issues. It is also recommended to check the battery's 12 volts. If the key fob will not unlock your car, you might be experiencing deprogramming. 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 the key fob on your Citroen C3 is no longer working, first make sure the battery has died. The batteries contained in the fobs are tiny, round coins that can be changed in a matter of seconds. These can be found in general stores, home improvement stores and auto parts stores. Be sure to purchase the right type. For fobs, batteries are typically CR2025 or CR2032 However you must consult the owner's manual for your vehicle to determine which type is required. Remove the button pad and then use cotton swabs or alcohol to clean it. This will help remove corrosion and clean the contacts that are usually gold-colored. Once the contacts are cleaned, you are able to install the new battery. Be cautious not to mix the two types as they have different voltages, dimensions, and shapes. The next step is to test the voltage of the battery. A multimeter that is calibrated to the battery's voltage range should give you an accurate reading. If the battery's current value is in the middle or above the threshold, then it must be replaced. You can also try to start your car using a spare key, however it may not be effective in all cases. If the problem persists then visit an CITROEN dealer with your V5 registration documents and personal identification documents. A CITROEN dealer will be able to retrieve the code for your vehicle's immobiliser and get an alternative battery. Water damage If the key fob is submerged, it could lose its signal to the car. If this happens, it's a good idea to get it out of the pool, puddle, or washing machine as fast as possible. After that, use an swab of cotton and isopropyl or electronic cleaner to dry the circuit board. If it doesn't work, it may be time to get a new key fob. Another common reason that can be the reason behind Citroen c3 remote control not working is signal interference. This can occur when there is an intense electrical field that is close to the vehicle, or from other transmitters operating on the same frequency. The key fob should start to work again once you leave the zone of interference. Lastly, the Citroen C3 key fob might stop working due to worn buttons, signal interference, receiver module issues, a dead 12 volt battery, or an indefective electronic chip. If this happens, then you'll have to have it reset by a professional. citroen c4 replacement key thekeylab.co.uk can be done either by a qualified mechanic, or a Citroen dealer. If the problem is severe then you'll have to get it replaced. It's an easy and inexpensive fix. However, you need to take action quickly. The longer you put off fixing the problem, the worse it becomes. It could be dangerous for you and your passengers If the issue isn't resolved. Issue with the Receiver module If your key fob stops functioning, it could be because the receiver module has developed an issue. It could be caused by a number of things, including water damage. This can happen if drop 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 keep the chip from getting damaged. You could also try to reset the receiver module by disconnecting it from the car battery and then waiting for 10 seconds. You can then reconnect the battery and repeat the procedure. If this isn't enough to fix the issue, you can take it to a dealership to be repaired. Another reason your key may stop working is due interference. This could be caused by other transmitters using the same frequency or by objects inside your vehicle. If you are unable to fix the issue, you can take your key fob to a dealer to be 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 is not correct, the receiver will not recognize the car key and display a message telling you “key not detected”. This could be a frustrating issue, especially when trying to start your vehicle. Dead 12 volt battery If your key fob stops working after changing the battery it could be damaged. This is especially common when the key fob is dropped or stepped on, but it can also happen following maintenance on your vehicle that requires the removal and reinstallation of the panels. Wires are exposed as panels are removed. If your fob is damaged, it might need to be replaced entirely. A remote that is receiving interference from other devices and locations is a different possibility. The RF signals can cause to weaken and stop the car from recognizing the remote. If this is the case you can reset the on-board computers by disconnecting the battery that is 12 volts for about 15 minutes. This will eliminate any remaining power and allow the system to start from scratch. Before replacing the battery, it's important to make sure that it's the right size and type. If the replacement battery is too small or has a different voltage, it could damage the circuit board inside the key fob. Also, you should clean any corrosive materials off the chip inside the fob prior to installing the new battery. The correct type of battery can ensure that the key fob is sealed and protected against moisture. Once the key fob is replaced, it should work normal. In most cases, you can use the second key to start your car even if it shows a message saying “key not detected.” It could be necessary to press the button multiple times before it responds.