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Citroen C3 Key Fob TroubleshootingCitroen key fobs might not function due to a variety of causes. This includes worn buttons, poor battery contact, water damage and issues with the receiver module. Examine the 12 volt batteries.Deprogramming could be the reason the key fob's inability to unlocking your car. This happens when certain buttons send an alert to the onboard computer requesting that the key be removed from its list of keys.Dead coin batteryIf 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 small, round coins that can be easily changed in a matter of seconds. citroen nemo key replacement The Key Lab can be found in general stores, home improvement stores, and auto parts stores. Be sure to purchase the correct model, however. The majority of fobs require CR2025 or CR2032, but you should check the owner's manual to see the exact type of battery your vehicle requires.Remove the button pad and then use cotton swabs or alcohol to clean it. This will help to remove corrosion and clean the contacts, which are typically colored gold. After cleaning the contacts then you can put in the new battery. Be cautious not to mix the two kinds as they have different voltages, diameters and shapes.The next step is to assess 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 shows a value above or below its threshold, it needs to be replaced. You can also start your car with a spare keys. However, this might not always work. If the issue persists go to an CITROEN dealer with your V5 registration form and personal identification documents. A CITROEN dealer can obtain the code for the immobiliser on your vehicle and get an alternative battery.Water damageWhen the key fob gets underwater it may lose its signal to the car. It is recommended to get it out as soon as possible out of the pool or puddle. Once you do dry the circuit board as well as you can using an abrasive swab of cotton that's been soaked in isopropyl alcohol or an electronic cleaner. If it's still not working, it may be time to get a new key fob.Another common cause for Citroen remote control c3 not working is signal interference. This could happen when there is an intense electrical field close to the vehicle or from other transmitters operating on the same frequency. Once you leave the interference area your key fob should be working normally again.Finally, the Citroen C3 key fob may cease to function due to worn buttons signals, signal interference, receiver module issues, a dead 12 volt battery, or an indefective electronic chip. If this happens, you'll probably require it to be reset by a professional. This can be done by a certified mechanic or at a Citroen dealership. If the issue is severe it's time to have it replaced. It's an easy and affordable fix. But you should act quickly. The longer you delay to fix the issue, the more severe it will be. If the issue isn't resolved the issue could be a hazard for you and your passengers.Issue with the Receiver moduleIf your key fob is not functioning the receiver module could have developed a fault. It could be caused by various factors, including water damage. It can happen when you accidentally drop your keys or wash them. You can repair the issue by removing the chip and cleaning it with isopropyl or electronic cleaner. This will help to avoid the chip from becoming damaged.You can 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 solve the issue, you can go to a dealership and have it replaced.Interference can also cause your key to stop working. It can be caused by other transmitters operating on the same frequency or by objects in your vehicle. If you are unable to fix the issue, you can take your key fob in to a dealer to be 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 correct the receiver will not recognize the car key and display a message saying "key not detected". This can be a frustrating problem, especially when you're trying to start your car.Dead 12 volt batteryIt is possible that your key fob is damaged if it stops working after a change of batteries. This is most likely to happen when the key fob is dropped or stepped upon, but it also can occur after servicing on your car that requires removal and reinstallation of the panels. Wires become exposed when panels are removed. If your fob is damaged, you might require replacement completely.Another possibility is that the remote is getting interference from other devices or locations. This could make RF signals weaker and block the car's recognition of the remote. If this happens you can reset all computer systems on board by disconnecting the battery at 12 volts for about 15 minutes. This will take away any remaining electricity, allowing the system to restart.It is important to check the size and quality of the battery prior to replacing it. The circuit board in the key fob can 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 inside the fob before installing the new battery. Making sure you choose the right battery can help ensure that it is sealed and protected from moisture. Once the key fob is replaced, it should work normally. It is usually possible to use the second key if your car displays a message that reads "key not found." You may have to press the button several times before it responds.