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Citroen C3 Key Fob Troubleshooting Citroen c3 key fobs can cease to function due to different reasons. Some of them include worn buttons or poor contact with the battery, water damage and receiver module problems. Check the 12 volt batteries. Deprogramming is a possible cause of your key fob not unlocking your car. This occurs when certain button combinations send a message to the onboard 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, check first if the battery is dead. The batteries contained in the fobs are tiny, round coins that can be replaced within a few moments. They can be found in general stores, home improvement stores and auto parts stores. Be sure to purchase the correct model, however. Fobs usually require CR2025 or CR2032, but you should consult your owner's manual to find out the specific type of battery that your car requires. Before replacing the battery, remove the button pad and rub it with cotton swabs and alcohol. This will help to remove corrosion and clean the contacts which are typically colored gold. After the contacts have been cleaned, you can then install the new battery. Just be careful not to mix the two kinds because they have different diameters and voltages. The next step is to check the voltage of the battery. You can obtain a precise reading using a multimeter, which is set to the battery's voltage range. If the battery's voltage is either above or below the threshold, it should be replaced. Try the car's start using an extra key, but this may not work in all situations. If the problem persists you should visit a CITROEN dealer with your V5 registration document and personal identification documents. A CITROEN dealer can obtain the code for the immobiliser on your vehicle and request a replacement battery. Water damage If the key fob is submerged it could lose its signal. If this occurs, it's a good idea to pull it out of the pool, puddle, or washing machine as soon as you can. After that dry the circuit board as much as you can with a cotton swab dipped in isopropyl ethanol or electronic cleaner. If the circuit board is still not working, it may be the right time to purchase a new key fob. Signal interference is another frequent cause of Citroen remote controls not working. TheKeyLab could happen when there is an intense electrical field in the vicinity of the car, or from other transmitters operating on the same frequency. When you leave the area of interference your key fob will be working normally again. The Citroen C3 key fob might not function because of worn buttons, signal interference issues, receiver module issues or a dead 12-volt battery or a malfunctioning chip. If this happens, you'll probably need to get it reprogrammed by an expert. This can be done by a qualified mechanic, or a Citroen dealer. If the issue is severe then you'll have to get it replaced. It's a simple and inexpensive fix. But you must be quick to act. The longer you put off fixing the issue, the more difficult it gets. It can be dangerous to you and your passengers if the problem is not fixed. Issue with the Receiver module If your key fob isn't working the receiver module could have developed an issue. This can be caused by a number of things, including water damage. This can happen if you lose your keys, or wash them. You can fix the problem by removing and cleaning the chip using isopropyl alcohol or electronic cleaner. This will prevent the chip from getting corroded. You can also reset the receiver module if you disconnect it from the battery, and wait 10 seconds. Then reconnect the battery to the vehicle and repeat the process. If this does not fix the issue, you can bring it to a dealer for replacement. Another reason why your key could stop working is due to interference. This could be caused by other transmitters that operate on the same frequency as your key fob, or by objects in your vehicle. If you are unable to resolve the issue, visit a dealer to have your key fob 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 is not accurate the receiver will not recognize the car key and display a message saying “key not recognized”. This could be a major issue especially when trying to start your car. Dead 12 volt battery It is possible that the key fob you have purchased has been damaged if it stops working after changing batteries. This is especially true when the key fob has been dropped or stepped on, however it can also happen after repair on your vehicle that requires removal and reinstallation of the panels. Wires are exposed when the panels are removed. If your fob is damaged, it might require replacement completely. A fob that is receiving interference from other devices and locations is a different possibility. The RF signals can cause to weaken and block the car from recognizing the remote. It is possible to reset the onboard computer in this situation by disconnecting the 12-volt battery for 15 minutes. This will remove any residual electrical energy, allowing the system to reboot. Before replacing the battery it is essential to ensure it's of the correct size and type. If the battery you replace is too small or has different voltage, it may damage the circuit board inside the key fob. Before installing a new battery, you should clean the chip of the fob in order to eliminate any harmful substances. Using the right type of battery will ensure that it is properly sealed and protected from moisture. Once the key fob's been installed, it should work normally. In most instances, you can use the second key to start your car, even when it displays an error message that reads “key not recognized.” You may have to press the button a few times before it responds.