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Citroen C3 Key Fob Troubleshooting The Citroen c3 keyfob may cease to function due to many reasons. The most common reasons are worn buttons, poor contact with the battery, water damage and receiver module problems. You should also check the battery's 12 volts. Deprogramming could be the cause of your key fob not unlocking your car. 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 the fob that you use to open the door on your Citroen C3 is no longer working, first determine if the battery is dead. Fobs are small coin-shaped batteries which can be replaced in just a few minutes. You can find these at home improvement stores, as well as some auto parts stores. Make sure you buy the correct type, though. The batteries for fobs are usually CR2025 or CR2032, however you must consult the owner's manual of your vehicle to determine what type is required. Take off 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 have been cleaned, it is now time to put in the new battery. Just be careful not to mix the two types as they have different voltages and sizes. Next, you will need to assess the voltage of the battery. A multimeter calibrated to the battery's voltage range will give you an accurate reading. If the battery's current value is higher or lower than the threshold, it needs to be replaced. You could also try the car's start using a spare key, but this may not be successful in all instances. If the problem persists you should visit an CITROEN dealer with your V5 registration documents and personal identification documents. A CITROEN Dealer can locate the code for your vehicle's immobiliser, and then order a new battery. Water damage If the key fob falls submerged, it could lose its signal to the car. It's best to get it out as soon as possible from the pool or puddle. Once you do dry the circuit board as best you can using a cotton swab dipped in isopropyl alcohol, or electronic cleaner. If the circuit board is still not working It could be time to get a new key fob. Signal interference is another frequent cause of Citroen remote controls not working. It can happen when there is an electrical field in the vicinity of the car or other transmitters using the same frequency. When you leave the interference area the key fob will be working normally again. The Citroen C3 key fob might cease to function due to worn buttons signals, signal interference issues receiver module problems or a dead 12-volt battery or a damaged chip. It will need to be reset when this happens. This can be done either by a trained mechanic or a Citroen dealer. If the issue is serious it is possible to replace it. It's a relatively easy and affordable fix. But you have to be quick to act. The longer you wait to address the issue, the more deteriorated it becomes. It could be hazardous to passengers and yourself when the issue is not resolved. Receiver module issue If your key fob ceases working, it might be due to the receiver module having developed an issue. It could be caused by various factors, including water damage. It can happen when you lose your keys or wash them. You can attempt to fix the problem by removing and cleaning the chip with isopropyl alcohol or an electronic cleaner. This will prevent the chip from getting corroded. You can also try to reset the receiver module by disconnecting it from the car battery, and waiting for 10 seconds. You can then reconnect the battery and repeat the process. If this doesn't fix the issue, you can take it to a dealership to be repaired. Interference can also cause your key to stop working. This can be caused by other transmitters that operate on the same frequency as your key fob or by objects in your vehicle. If you're not able to solve the issue, you can bring your key fob to an authorized dealer to have it 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 will display a message that says “Key Not Detected. genuine citroen car keys could be a major issue especially when you attempt to start your vehicle. Dead 12 volt battery It is possible that the key fob you have purchased has been damaged if it ceases to function after changing batteries. This is more likely in the event that your key fob has been dropped or stepped upon However, it can happen after a service that requires the removal of panels and the reinstallation. Wires are exposed when the panels are removed. If your fob has been damaged, it may require replacement. A fob that is receiving interference from other devices and locations is also a possibility. This could cause the RF signals to weaken and stop the car from recognizing the remote. You can reset the on-board computer if this is the situation, by disconnecting the 12-volt battery for 15 minutes. This will eliminate any remaining electrical charge and let the system start from scratch. It is crucial to determine the size and type of the battery prior to replacing it. The circuit board on the key fob can be damaged in the event that the replacement battery is too large or has a different voltage. Before you install a battery you must clean the chip of the fob to eliminate any corrosive substances. Using the right battery will ensure that it is sealed and shielded from moisture. Once the key fob is replaced, it should work normal. In most instances, you will be able to use the second key to start your car even when it displays the message “key not detected.” You may have to press the button several times before it responds.