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Citroen C3 Key Fob Troubleshooting Citroen c3 key fobs can not function for many reasons. These include worn buttons, poor contact between the battery and the water and receiver module problems. You should also check the battery's 12 volts. Deprogramming could be the reason the key fob's not unlocking your car. This happens when certain key sequences send a signal to the onboard computer to remove the key from its access list. Dead coin battery If your Citroen's C3's key fob isn't working The first thing you need to examine is whether the battery is dead. Fobs use small coin-shaped batteries which can be replaced in a few minutes. They are available in general stores, home improvement stores, and auto parts stores. Be sure to purchase the correct type. Fobs typically require CR2025 or CR2032, but you should consult your owner's manual to see the exact kind of battery your vehicle requires. Before replacing the battery, remove the button pad and rub it with cotton swabs and alcohol. This will remove any corrosion and clean the contacts that are usually gold colored. Once the contacts have been cleaned, it is now time to insert the new battery. Be cautious not to mix the two kinds as they have different voltages, dimensions and shapes. The next step is to examine the battery's voltage. You can get an accurate reading using a multimeter, which is set to the battery voltage range. If the battery's reading is higher or lower than the threshold, it should be replaced. You can also start your vehicle using a spare key. However, this might not always work. If the issue continues you should visit a CITROEN dealer with your V5 registration certificate and personal identification documents. A CITROEN dealer can retrieve the code for your vehicle's immobiliser system and request the replacement battery. Water damage If the key fob is submerged, it can lose its signal. If genuine citroen key fob replacement happens, it's a good idea to pull it out of the puddle, pool or washing machine as quickly as possible. After that then use a cotton swab, isopropyl or electronic cleaner to clean the circuit board. If it doesn't work, it may be time for a new key fob. Signal interference is another common cause of Citroen remote control not working. It can happen when there is an electrical field near the car or other transmitters on the same frequency. Once you have left the interference area the key fob will start working again. The Citroen C3 key fob might stop working because of worn buttons problems with signal interference, receiver module issues or a dead battery or a defective chip. It will need to be reprogrammed when this happens. This can be done by a qualified mechanic, or a Citroen dealer. If the problem is serious you may have to replace it. It's a relatively easy and inexpensive fix. However, you need to take action quickly. The longer you put off taking action to address the issue, the more severe it will be. It could be hazardous to passengers and yourself in the event that the issue isn't solved. Issue with the Receiver module If your key fob isn't functioning, the receiver module may have developed an issue. It could be caused by several things like water damage. It can happen when you drop your keys, or wash them. It is possible to solve the problem by removing your chip and cleaning it with isopropyl and electronic cleaner. This will help to prevent corrosion of the chip. You can also 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 procedure. If this isn't enough to fix the problem, you can take it to a dealer for replacement. Interference can cause your key to stop working. It could be caused by other transmitters that use the same frequency as your key fob, or by objects within your vehicle. If you are unable fix the issue, you can take your key fob to a dealer to be 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 accurate it will not recognize the car key and display a message telling you “key not recognized”. This is a problem that can be frustrating especially when trying to start your car. Dead 12 volt battery It is possible that your key fob is damaged if it ceases to function after a change of batteries. This is especially true when the key fob has been dropped or stepped on, but it also can occur after service on your car that requires removal and reinstallation of the panels. When the panels are removed, wires are exposed. If your fob was damaged, it might require replacement. Another possibility is that the remote receives interference from other devices or locations. This can cause RF signals to become weak and prevent the car from acknowledging the remote. If this is the case it is possible to reset all on-board computers by disconnecting the 12 volt battery for about 15 minutes. This will remove any residual electrical energy, allowing the system to restart. It is important to check the size and quality of the battery prior to replacing it. The circuit board inside the key fob can be damaged if the replacement battery is too big or has an unrelated voltage. It is also recommended to clean any corrosive substances from the chip in the fob prior to installing the new battery. The right battery type can ensure that the key fob is sealed and protected against moisture. Once the key fob is installed, it will function normal. In the majority of cases, you can use the second key to start your vehicle even if it shows the message “key not detected.” You may have to press the button a few times before it responds.