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Citroen C3 Key Fob Troubleshooting Citroen key fobs can malfunction due to a variety of reasons. The most common reasons are worn buttons or poor contact with the battery, water damage and receiver module problems. Check the 12 volt battery. If your key fob does not unlock your car, you might be experiencing deprogramming. This occurs when certain buttons send an electronic message to the computer requesting that the key be removed from its list of keys. Dead coin battery If your Citroen C3's key fob no longer works the first thing you should examine is whether the battery is dead. The batteries that are in the fobs are small, round coins that can be easily changed in a matter of seconds. They are sold in general stores, home improvements stores and auto parts stores. Be sure to purchase the correct model, however. Fobs usually require CR2025 or CR2032, but you should check the owner's manual to determine the kind of battery your vehicle requires. Take off the button pad and use cotton swabs and alcohol to clean it. This will remove any corrosion and clean the contacts which are typically gold-colored. Once the contacts have been cleaned, you can put in the new battery. Be cautious not to mix the two types since they have different voltages, sizes and diameters. The next step is to examine the battery's voltage. You can obtain a precise reading using a multimeter that is calibrated to the battery's voltage range. If the battery's value is above or below threshold, then it needs to be replaced. You can also try getting your car started using an additional key, however this may not work in all cases. If the issue continues, visit an CITROEN dealership with your V5 registration and identity documents. A CITROEN dealer can find the code of your vehicle's immobiliser and can order new batteries. Water damage If the key fob is submerged it can lose its signal. It's best to get it out as soon as possible from the pool or puddle. After you've done this, use the cotton swab along with isopropyl or electronic cleaner to clean the circuit board. If it's still not working then it's time for a new key fob. Signal interference is another frequent reason for Citroen remote controls not working. It can happen when there is a strong electrical field close to the car or from other transmitters operating on the same frequency. Once you leave the area of interference the key fob will be working normally again. The Citroen C3 key fob may not function because of worn buttons or signal interference issues, receiver module problems as well as a dead 12-volt battery or a damaged chip. If this happens, you'll likely have to have it reset by a professional. This can be accomplished by a qualified mechanic or at an Citroen dealership. If the issue is severe you may have to replace it. This is a relatively simple and inexpensive fix, but it's crucial to act fast. The longer you wait to fix the issue, the worse it becomes. It could be hazardous to passengers and yourself If the issue isn't solved. Receiver Module Issue If your key fob stops functioning, it could be because the receiver module has developed a fault. Water damage is one of the many reasons. This could happen if you lose your keys or wash them. It is possible to solve the issue by removing and cleaning the chip with isopropyl alcohol, or electronic cleaner. This will keep the chip from corrosion. You can also reset the receiver module if you disconnect it from the battery for 10 seconds. Then reconnect the battery to the car and repeat the process. If this doesn't resolve the issue, you can go to a dealership and have it replaced. Another reason why your key might stop working is due to interference. This could be caused by other transmitters using the same frequency or objects inside your vehicle. If you're not able to fix the issue, you can go to a dealer to 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 isn't right, the receiver module will not recognize the key and will display a message that says “Key Not Detected. This could be a major issue, especially when trying to start your car. Dead 12 volt battery If your key fob ceases working after an upgrade to a battery It could be damaged. This is especially true when the key fob has been dropped or stepped on, however it also can occur after maintenance on your vehicle that requires removal and reinstallation of the panels. When the panels are removed, the wires are exposed. If your fob was damaged, it may require replacement. A fob that receives interference from other devices or locations is a second possibility. G28 Car Keys can cause to weaken and block the car from understanding the remote. If this is the case you can reset the computer systems on board by disconnecting the battery at 12 volts for around 15 minutes. This will erase any remaining electric current, allowing your system to restart. Before replacing the battery, it's crucial to ensure it's the correct size and type. The circuit board that is inside the fob's key could be damaged if the replacement battery is too large or has an incompatible voltage. It is also recommended to clean any corrosive substances from the chip in the fob before installing a new battery. Making sure you choose the right battery can help ensure that it is properly sealed and shielded from moisture. Once the key fob has been reinstalled, it should function normally. You can usually use the second key the car displays a message that says “key not detected.” It could be necessary to press the button several times before it responds.