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Citroen C3 Key Fob Troubleshooting Key fobs from Citroen can malfunction due to a variety of reasons. This includes worn buttons, poor battery contact, water damage and receiver module problems. Check the 12 volt battery. If your key fob does not unlock your car, you could be experiencing deprogramming. This happens when certain button combinations send an alert to the onboard computer, asking that the key be removed from its list of keys. Dead coin battery If your Citroen C3's main fob is not working the first thing to look for is if the battery is dead. The batteries contained in the fobs are tiny, round coins that can be changed in a matter of seconds. They are sold in general stores, home improvement stores, and auto parts stores. Be sure to buy the correct type. The batteries for fobs are usually CR2025 or CR2032, however you should refer to the owner's manual for your vehicle to determine which type is required. Before you replace the battery, take off the button pad and rub it with alcohol and cotton swabs. They will remove the corrosion and clean the contacts, which are usually colored gold. Once the contacts are cleaned, you can install the new battery. Be cautious not to mix the two types as they differ in voltage, dimensions, and shapes. The next step is to check the battery's voltage. A multimeter that is set to the battery's voltage range will give you an accurate reading. If the battery's value is higher or lower than the threshold, it should be replaced. You can also start your car using a spare key. However, this may not always work. If the issue persists you should visit a CITROEN dealer with your V5 registration document and personal identifi cation documents. A CITROEN dealer can find the code of the immobiliser on your vehicle and purchase a new battery. Water damage If the key fob is submerged, it could lose its signal. If this happens, it's a great idea to fish it out from the pool, puddle or washing machine as fast as possible. Once you do, dry out the circuit board as well as you can with 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 common cause of Citroen remote control not working. It can happen when there is an intense electrical field that is close to the car, or from other transmitters operating on the same frequency. Once you leave the interference area your key fob will restart working. Additionally, the Citroen C3 key fob may not function due to worn buttons signals, signal interference, receiver module issues or a dead 12 Volt battery, or a damaged electronic chip. It will need to be replaced if this happens. This can be done by a certified mechanic or at an Citroen dealership. If the issue is serious, you may need to replace the device. This is a simple and cost-effective fix, however it's imperative to act swiftly. The longer you delay fixing the problem, the worse it gets. It could be hazardous to passengers and you when the issue is not fixed. Receiver Module Issue If your key fob is not functioning the receiver module could have developed an issue. Water damage is among the many causes. This could happen if you lose your keys, or wash them. You can fix it by removing the chip and cleaning it with isopropyl, or electronic cleaner. This will keep the chip from getting damaged. You can also try to 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 process. If this doesn't fix the issue, bring it to a dealer to have it replaced. Interference can also cause your key to stop working. This could be caused by other transmitters that use the same frequency as your key fob, or by objects within your vehicle. If you're not able to fix the issue, visit a dealer to 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 is not right it will not recognize the car key and display a message saying “key not detected”. This could be a frustrating issue, especially if you're trying to start your vehicle. Dead 12 volt battery If your key fob ceases working after an upgrade to a battery It could be damaged. This is especially common when the key fob is dropped or stepped upon, but it can also happen following service on your car that requires the removal and reinstallation of the panels. Wires are exposed as panels are removed. If your fob is damaged, you might require replacement completely. Another possibility is that the fob receives interference from other devices or places. This can make RF signals weaker and block the car from being able to recognize the remote. You can reset the onboard computer in this situation. You can do this by disconnecting the 12-volt battery for 15 minutes. This will eliminate any remaining electric current, allowing your system to reboot. It is crucial to determine the size and quality of the battery prior to replacing it. The circuit board inside the fob's key can become damaged in the event that the replacement battery is too large or has an incompatible voltage. Before installing Full Review should clean the chip of the fob to eliminate any contaminants that could cause corrosion. The proper type of battery will ensure that the key fob is sealed and shielded from moisture. Once the key fob is put back in place, it should function normally. You can usually use the second key the car displays a message saying “key is not recognized.” You may need to press the button several times before it responds.