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Citroen C3 Key Fob Troubleshooting Citroen c3 key fobs can stop working for different reasons. They can be due to worn buttons, poor contact between the battery and the water, and receiver module issues. You should also examine the battery's 12 volts. If the key fob does not unlock your car, you could be experiencing deprogramming. This happens 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's C3's key fob no longer works The first thing you need to determine is if the battery is dead. The batteries that are in the fobs are small round coins that can be changed in a matter of seconds. citroen berlingo key can find these at home improvement stores, and some auto parts stores. Make sure you purchase the correct kind. Fobs typically require CR2025 or CR2032 However, it is recommended to look through the owner's guide to see the exact type of battery your car requires. Take off the button pad and then use cotton swabs or alcohol to clean it. This will help remove corrosion and clean the contacts, which are typically gold-colored. Once the contacts are cleaned, you can insert the new battery. Just be careful not to mix the two types as they have different voltages and sizes. The next step is to determine the voltage of the battery. You can get a precise reading with a multimeter that is set to the battery voltage range. If the battery shows a voltage that is higher or lower than its threshold, it needs to be replaced. You can also start your vehicle with a spare keys. However, this might not always work. If the issue persists, go to an CITROEN dealership with your V5 registration number and personal identification documents. A CITROEN dealer can obtain the code for your vehicle's immobiliser and order an alternative battery. Water damage When the key fob goes underwater, it may lose its signal to the car. If this happens, it's a great idea to fish it out from the pool, puddle or washing machine as quickly as you can. Once you have done that dry the circuit board in the best way you can using the help of a cotton swab, dipped into isopropyl alcohol or electronic cleaner. If the key fob does not work, it may be time to get an additional one. Signal interference is a different cause of Citroen remote controls not working. This can happen when there is an electrical signal near the car or other transmitters operating on the same frequency. The key fob will begin to work again once you have left the zone of interference. Finally, the Citroen c3 key fob can stop working due to worn buttons, signal interference, receiver module issues and a dead 12 volt battery, or a malfunctioning electronic chip. You'll have to get it reprogrammed in the event of this. This can be done by a certified mechanic or at an Citroen dealership. If the problem is severe then you'll have to get it replaced. It's a simple and inexpensive fix. But you have to get it done quickly. The longer you delay fixing the issue, the worse it gets. It could be dangerous for passengers and you in the event that the issue isn't addressed. Receiver Module Issue If your key fob ceases working, it could be due to the receiver module having developed an issue. This could be due to many things such as water damage. This could happen if you lose your keys or wash them. You can fix it by removing the chip and cleaning it with isopropyl and electronic cleaner. This will prevent the chip from corroding. You could 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 vehicle and repeat the process. If this doesn't fix the issue, take it to a dealer to be repaired. Another reason why your key could stop working is due to interference. This can be caused either by other transmitters that operate on the same frequency, or by objects in your vehicle. If you're unable to fix the problem, you can go to a dealership to have your key fob 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 doesn't match, the receiver module will not recognize the key and display a key not detected message. This can be a frustrating issue especially when trying to start your vehicle. Dead 12 volt battery If your key fob stops working after an upgrade to a battery the device could be damaged. This is especially true when the key fob is dropped or stepped on, but it can also happen after servicing on your car which requires the removal and reinstallation of panels. When the panels are removed, the 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 weaken and block the car from understanding the remote. If this is the case you can reset all on-board computers by disconnection of the battery with 12 volts for approximately 15 minutes. This will eliminate any remaining electricity and allow the system to start from scratch. It is crucial to determine the size and quality of the battery before replacing it. The circuit board in the fob's key could be damaged when the replacement battery is too large or has an incompatible voltage. It is also recommended to clean any corrosive material from the chip inside the fob before installing the new battery. The correct type of battery can ensure that the key fob is sealed and shielded from moisture. After the key fob has been installed, it will function normal. You should be able to use the second key when your car displays a message saying “key not detected.” It could be necessary to press the button multiple times before it responds.