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Citroen C3 Key Fob Troubleshooting Citroen c3 key fob can stop working for many reasons. This includes worn buttons, poor contact with the battery, water damage and receiver module problems. You should also examine the 12 volt battery. Deprogramming may be the cause the key fob's inability to unlocking your car. citroen relay key fob occurs when certain buttons send a signal to the onboard computer to erase the key from its access list. 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 has gone out. The batteries that are in the fobs are tiny, round coins that can be easily replaced in a matter of minutes. They are available in general stores, home improvement stores, and some auto parts stores. Be sure to buy the correct kind. Batteries for fobs are typically CR2025 or CR2032, however, you should consult the owner's manual for your vehicle to determine what kind is required. Before you replace the battery, take off the button pad and rub it with cotton swabs and alcohol. They will remove the corrosion and clean the contacts, which are typically colored gold. Once the contacts are cleaned, you are able to add the new battery. Be careful not to mix the two types as they have different voltages and sizes. Next, you will need to determine the voltage of the battery. A multimeter that is set to the battery's voltage range will give you a reliable reading. If the battery is at the value that is either above or below its threshold, it needs to be replaced. You could also try getting your car started using an additional key, however this may not be successful in all instances. If the problem persists then visit an CITROEN dealer with your V5 registration form and personal identifi cation documents. A CITROEN Dealer can locate the code of your vehicle's immobiliser and can order the replacement battery. Water damage If the key fob is submerged, it could lose its signal. It is best to remove it as quickly as possible from the pool or puddle. After you've done this make use of the cotton swab along with isopropyl or electronic cleaner to clean the circuit board. If it doesn't work then it's time to get a new key fob. Signal interference is a common reason for Citroen remote controls not working. This could happen if there is an electrical field close to the car or other transmitters operating on the same frequency. The key fob should start to function again after you are out of the zone of interference. The Citroen C3 key fob can stop working because of worn buttons problems with signal interference, receiver module issues as well as a dead 12-volt battery or a damaged chip. If this happens, you'll likely require it to be reprogrammed by an expert. This can be accomplished by a qualified mechanic, or an Citroen dealer. If the issue is severe then you'll have to get it replaced. It's a simple and cost-effective fix, however it's imperative to act swiftly. The longer you put off taking action to address the issue, the more severe it will be. If the issue isn't fixed it could be a risk for passengers and you. Issue with the Receiver module If your key fob isn't functioning it could be because the receiver module might have developed an issue. This can be caused by many things such as water damage. This can happen if you drop your keys, or wash them. You can fix the problem by taking off the chip and cleaning it with isopropyl and electronic cleaner. This will stop the chip from corroding. You can also reset the receiver module if you disconnect it from the battery and wait 10 seconds. You can then reconnect the battery and repeat the process. If this does not fix the problem, you can take it to a retailer to be replaced. Another reason your key could be unable to function is due interference. This could be caused by other transmitters using the same frequency as your key fob or even objects in your vehicle. If you are unable to resolve the problem, you can visit a dealer and 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 an error message that states the key is not detected. This can be a frustrating issue, especially when trying to start your vehicle. Dead 12 volt battery It is possible that your key fob is damaged if it stops working after a change of batteries. This is more frequent when the key fob been dropped or stepped over, but can also occur after a service that requires the removal of panels and the reinstallation. Wires are exposed when these panels are removed. If your fob is damaged, you may need to replace it completely. Another possibility is that the fob receives interference from other devices or places. This could cause RF signals to weaken and block the car from acknowledging the remote. You can reset the onboard computer if this is the situation, by disconnecting the 12-volt battery for 15 minutes. This will eliminate any remaining electricity, allowing the system to restart. It is essential to verify the size and type of the battery prior to replacing it. If the battery you replace is too small or has an unsuitable voltage, it could harm the circuit board inside the fob's key. Before you install a battery you must clean the chip of the fob in order to eliminate any contaminants that could cause corrosion. The right battery type can ensure that the key fob is sealed and shielded from moisture. After the key fob has been reinstalled, it should function normally. It is usually possible to use the second key the car displays a message that says “key not found.” It might be necessary to press the button multiple times before it responds.