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Citroen C3 Key Fob Troubleshooting Citroen key fobs might stop working due to a variety of causes. They can be due to worn buttons, poor battery contact, water damage and receiver module issues. Also, you should check the battery's 12 volts. Deprogramming may be the cause the key fob's not unlocking your car. This occurs when certain buttons send an alert to the onboard computer requesting that the key be removed from its list of keys. Dead coin battery If your Citroen C3's main fob no longer works The first thing you need to check is if the battery is dead. Fobs are small coin-shaped batteries which can be replaced in a few minutes. These can be found in general stores, home improvement stores, and auto parts stores. Be sure to buy the correct model. Fobs typically require CR2025 or CR2032, but you should consult your owner's manual to find out the specific kind of battery your vehicle requires. Remove the button pad and use cotton swabs and alcohol to clean it. These will help remove corrosion and clean the contacts which are usually colored gold. Once the contacts have been cleaned, you can insert the new battery. Be careful not to mix the two batteries because they differ in their voltages and diameters. Next, you will need to determine the voltage of the battery. You can get a reliable reading using a multimeter which is set to the battery voltage range. If the battery has an amount that is above or below its threshold, it needs to be replaced. You can also try to start your car using a spare key, however it may not be effective in all cases. If the issue continues, visit an CITROEN dealership with your V5 registration and identification documents. A CITROEN Dealer can locate the code for your vehicle's immobiliser and can order the replacement battery. Water damage If the key fob is underwater it may lose its signal to the car. It is best to get it out as soon as possible out of the pool or puddle. After that dry the circuit board as best you can with a cotton swab that has been dipped in isopropyl alcohol or an electronic cleaner. If it's still not working it could be time to get a new key fob. Signal interference is a different cause of Citroen remote controls not working. This can occur when there is an electrical field in the vicinity of the vehicle or other transmitters on the same frequency. Once you have left the area of interference the key fob will be working normally again. Lastly, the Citroen C3 key fob might stop working due to worn buttons signals, signal interference, receiver module issues or a dead 12 volt battery, or a defective electronic chip. You'll need it reset if this happens. This can be done by a qualified mechanic, or a Citroen dealer. If the issue is serious it may be necessary to replace the device. It's a simple and inexpensive fix. But you must act quickly. The longer you take to correct the issue the more severe it will be. It could be dangerous for passengers and yourself in the event that the issue isn't solved. www.g28carkeys.co.uk If your key fob is not working the receiver module could have developed an issue. This could be due to several things such as water damage. This can happen when you accidentally drop your keys or wash them. You can try to fix it by removing the chip and cleaning it with isopropyl or an electronic cleaner. This will keep the chip from corroding. You could also try to reset the receiver module by disconnecting it from the car battery and waiting for 10 minutes. Then, reconnect the battery and repeat the procedure. If this doesn't fix the problem, you can take it to a dealership for replacement. Interference can also cause your key to stop working. This can be caused by other transmitters that operate on the same frequency as your key fob or by objects within your vehicle. If you are unable to resolve the issue, you can go to a dealer to get 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 doesn't match the receiver module won't recognize the key and display a message that says “Key Not Detected. This can be a frustrating issue, particularly when trying to start your vehicle. Dead 12 volt battery If your key fob ceases working after the battery has been changed the device could be damaged. This is particularly true when the key fob has been dropped or stepped on, but it can also happen following service on your car which requires the removal and reinstallation of the panels. Wires become exposed when panels are removed. If your fob was damaged, it might require replacement. Another possibility is that the fob is receiving interference from other devices or locations. This could cause the RF signals to become weak and prevent the car from recognizing the remote. You can reset the on-board computer if this is the situation, by disconnecting the 12-volt battery for 15 minutes. This will remove any residual electricity, allowing the system to restart. Before replacing the battery it's important to make sure it's of the correct type and size. If the battery you replace is too small or has an unsuitable voltage, it could harm the circuit board in the fob's key. Before you install a battery you should clean the chip inside the fob to get rid of any contaminants that could cause corrosion. Making sure you choose the right battery will ensure that it is properly sealed and shielded from moisture. Once the key fob is been reinstalled it should function normally. You can usually use the second key the car displays a message stating “key not found.” You may need to press the button a few times before it responds.