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Citroen C3 Key Fob Replacement If your C3's keypad stopped completely, it could be due to a faulty receiver module. If the key fob's function is functional, the issue could be caused by something else, such as water damage or a dead coin battery. The eC3 is targeting the mass market, so Citroen has focused on making service easier for customers. It has a range of features including virtual remote diagnosis and a dedicated app for customer service. Dead coin battery If the unlock button on the key fob doesn't work, it could mean that the battery inside the coin is not working properly. The battery is expected to last between three and four years if used regularly but it can fail abruptly. Fortunately, car manufacturers have built-in fail-safes that ensure you can still lock and start your vehicle even if the key fob is dead battery. G28 Car Keys in the key fob is normally secured by metal retaining clips that complete the circuit. The battery might not be powered if the clips are dirty or worn. The battery should also be the correct size and type. If the battery is too small or large it won't fit into the fob and won't function properly. Key fob batteries are available under various names including CR2016 and CR2032. They cannot be interchanged. Read the owner's guide for your particular model or look for a sticker on the fob that contains the information. When you've got the proper battery and it's replaced, it's possible to replace it within a matter of minutes. Most fobs feature a slider, gap, or switch that you can use to break open the cover and swap the original battery for a new one. Make sure the new battery is of the same voltage and that it is placed in the correct orientation. Water damage Water is harmful to electronics even if they've been through the wash cycle or a dip. It can ruin batteries and cause serious damage to the electronic chip inside. There are some things that you can do to limit the risk of damage. It's important to first remove the battery first, and then dry the inside as possible. You can also use a cotton swab that has been dipped in 90 percent isopropyl alcohol to cleanse the battery and circuit board. After cleaning the key fob you should let it dry for several days. You can speed it by placing it on a shelf to ensure it doesn't get smashed. When you're certain that it is bone dry, try putting in a new battery and running it as usual. If the key fob isn't working, it could have a problem with the receiver module that's not transmitting signals to your car. It can be costly to fix, but it's worth trying if you want to avoid having to buy a new one. The easiest method to fix a faulty key fob is to replace the battery. The radio signal will be restored and your key fob should work again after changing the battery. If the problem persists you should seek professional assistance. Receiver module that is defective In some instances, the key fob's receiver module could be defective that prevents it from receiving and transmitting the proper signal. In this scenario the car won't recognize the remote control key. It will not unlock or start. In this scenario it is likely that a replacement remote is required. Check out the owner's guide prior to attempting to modify the key fob by yourself. First, check that the battery in the key fob is in good condition and that all of its buttons are functioning. Close the doors and remove any devices that are not from the market, like alarms or radios out of the vehicle. You can also clean the chip using isopropyl or electronic cleaner. If the chip has become damaged, you'll need to replace it. After cleaning the key fob, remove the circuit board. Then use alcohol swabs to clean the contacts and let them air dry. When the contacts are dry then you can reassemble the key fob and test it. If the key fob doesn't work, then it may be necessary to replace the battery. Use a battery that has the same voltage as the old battery. It's recommended to check that the battery is in place, as the contact points can be extremely sensitive. Keyless entry system that isn't working properly It can be quite frustrating if the key fob stops working. The good news is that the majority of the time it's a breeze to get it working again. A dead battery in the coin slot is the most common reason for a fob that is malfunctioning. It can be replaced in a matter of minutes. Other causes include signal interferance or a malfunctioning module and other electrical issues. The first thing to do is to make sure that the battery is running at the correct voltage and that it is properly placed. It is also crucial to use the correct type. Using a wrongly sized, or polarized one could cause damage to the internal circuitry. Examine the fuses to determine if they are damaged or been melted. Another possibility is that the transponder inside the key could have been damaged or gone missing. This issue requires further examination by a car dealer or a professional mechanic. A lot of auto locksmiths and dealerships can reprogram the fob of your car's keys for a fee, however this can be expensive. It might be worth it to reprogram your spare fob if you own one. The instructions are usually found in the owner's manual. If you do not have the manual, you can find the instructions online or on YouTube. Before you attempt to repair the key fob, it's essential to read the owner's guide.