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Citroen C3 Key Fob Troubleshooting Citroen key fobs might malfunction due to a number of reasons. The most common reasons are worn buttons and poor contact with the battery, water damage and receiver module issues. Also, you should check the 12 volt battery. If the key fob does not unlock your car, you may be experiencing deprogramming. This happens when certain button sequences send an instruction to the computer onboard to remove the key from its access list. G28CarKeys If the key fob on your Citroen C3 is no longer working, check first if the battery has died. Fobs have small, coin-shaped batteries that can be replaced in just a few minutes. They are sold in general stores, home improvements stores and auto parts stores. Make sure you buy the correct one, however. For fobs, batteries are typically CR2025 or CR2032, however, you should consult the owner's manual for your vehicle to determine what type is required. Take off the button pad and use cotton swabs and alcohol to clean it. This will remove any corrosion, and clean the contacts that are usually gold colored. Once the contacts are cleaned, you can then add the new battery. Be cautious not to mix the two types as they differ in voltage, dimensions and shapes. Next, you will need to test the voltage of the battery. You can get a reliable reading using a multimeter which is set to the battery voltage range. If the battery is at the value that is either above or below its threshold, it has to be replaced. You can also start your vehicle by using a spare key. However, this may not always work. If the issue continues, visit an CITROEN dealership with your V5 registration and identification documents. A CITROEN Dealer can obtain the code for the immobiliser on your vehicle and purchase the replacement battery. Water damage If the key fob is submerged, it could lose its signal. It is advised to remove it as quickly as you can from the pool or puddle. After this using a cotton swab and isopropyl or electronic cleaner to dry the circuit board. If it still doesn't work then it's time for a new key fob. Signal interference is another frequent reason for Citroen remote control not working. This could happen when there is a strong electrical field that is close to the car or from other transmitters operating on the same frequency. The key fob is expected to begin to function again after you are out of the zone of interference. Finally, the Citroen C3 key fob might cease to function due to worn buttons and receivers, signal interference, module issues or a dead 12 Volt battery, or a damaged electronic chip. You'll have to get it changed to a new program in the event of this. This can be done by a qualified mechanic, or a Citroen dealer. If the issue is significant the vehicle will need to be it replaced. This is a fairly easy and affordable fix, but it's imperative to act swiftly. The longer you put off taking action to resolve the issue, the more serious it will get. It could pose a risk to passengers and you if the problem is not addressed. Issue with the Receiver module If your key fob is not functioning the receiver module could have developed an issue. It could be caused by various factors, including water damage. This can happen if you lose 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 help to prevent corrosion of the chip. You can also try to reset the receiver module by disconnecting it from the car battery and then waiting for 10 minutes. Then, reconnect the battery and repeat the procedure. If this does not resolve the issue, bring it to a dealer for replacement. Interference can also cause your key to stop working. It could be caused by other transmitters that use the same frequency as your key fob, or even objects in your vehicle. If you're unable fix the issue, visit a dealer and change the key fob's programming. 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 will display a key not detected message. This can be a frustrating problem particularly when trying to start your vehicle. Dead 12 volt battery It is possible that your key fob may have been damaged if it ceases to function after changing batteries. This is most likely to happen when the key fob is dropped or stepped on, however it also can occur after maintenance on your vehicle which requires the removal and reinstallation of the panels. Wires become exposed when panels are removed. If your fob is damaged, you may need to replace it completely. Another possibility is that the remote may be receiving interference from other devices or locations. This could cause RF signals to weaken and block the car from being able to recognize the remote. If this happens you can reset all on-board computers by disconnection of the battery with 12 volts for around 15 minutes. This will erase any remaining power, allowing the system to restart. It is essential to confirm the size and type of the battery before replacing it. The circuit board that is inside the fob's key could be damaged in the event that the replacement battery is too big or has different voltage. It is also recommended to clean any corrosive substances from the chip in the fob prior to installing a new battery. Using the correct type of battery can help ensure that it is sealed and protected from moisture. After the key fob has been put back in place, it should function normally. You can usually use the second key in the event that your vehicle displays a message that reads “key not found.” It is possible to press the button several times before it responds.