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Citroen C3 Key Fob Replacement If your C3's key fob stops working all of a sudden it could be due to a defective receiver module. If the key fob is operational, the issue could be caused by something else, like water damage or a dead battery for the coin. Citroen hopes to meet the needs of the masses with its eC3. It offers several facilities including remote diagnostics via virtual technology and a dedicated customer service app. Dead coin battery If the key fob's unlock button is not working, there may be a problem with the coin battery. The battery should last between three and four years if used regularly but it is possible to die unexpectedly. Fortunately, car manufacturers include fail-safes in their products so that you can unlock and start your car even if the key fob is dead battery. The battery inside the key fob is secured with clips made of metal, which complete an electrical circuit. The battery may not be powered if these clips are worn or dirty. The battery also needs to be of the correct size and type. The battery will not fit into the fob if it's too big or too small. Key fob batteries are commonly sold under various names, including CR2016 and CR2032 (though these are not interchangeable). The best way to determine which one to buy is to check your owner's manual, or look at the fob to find the sticker with a label that gives you the specific information. If you've found the right battery, it can be replaced in a matter of seconds. Most fobs have a slider, switch, or gap that can be used to pry open the cover to swap out the original battery for a new one. Make sure the new one is the same size and voltage, and is inserted in the correct orientation. Water damage Water is harmful to electronics, even if they have survived a wash cycle or a dip. It can destroy the battery and cause severe damage to the electronic chip inside. Fortunately, there are options to minimize the damage. It is important to first take out the battery first, and then dry out the interior as much as you can. G28 can also clean the battery using a cotton swab that has been submerged in 90 percent alcohol. After you have cleaned the key fob, you must let it dry for several days. You can speed this process by placing it on a shelf so it won't get disturbed. Once you are sure that the battery is dry, you can put in an additional battery and continue using it as usual. If your key fob is not working, it could be that the receiver module inside your car is malfunctioning and is not able to transmit signals. This could be expensive to repair, but it's worth trying if you want to avoid having to buy a new one. The most straightforward solution to fix a broken key fob is to replace the battery. The radio signal will be restored and your key fob should work once you replace the battery. If the issue persists then you should seek out professional help. Receiver module that is defective In some cases, the key fob's receiver module could be defective that hinders it from receiving and transmitting the proper signal. In this instance the car won't recognize the remote control key. It will not unlock or start. In this case the replacement remote control will be needed. Consult your owner's guide before attempting to program the key fob yourself. First, check that the battery of the key fob is in good working order and that all buttons are functioning. Also, shut the doors and remove any accessories like radios or alarm systems from the vehicle. You can also try cleaning the chip using isopropyl alcohol or electronic cleaner. If the chip has been fried, you will have to replace it. After you've cleaned the key fob, take it off its circuit board. Then, clean the contacts using alcohol swabs and let them dry. After the contacts are dry you can reassemble them and test the key fob. If the key fob still does not work, it may be required to replace the battery. Make sure you choose a battery with the same voltage level that the original battery. It is recommended to make sure the battery is placed in the correct position and that the contact points are very sensitive. Keyless entry system malfunctions The key fob is a great feature for cars however it can be frustrating when it ceases to function. The good news is that, most times it's easy to get it back up and running. A dead coin battery is the most frequent cause of a malfunctioning fob. This can be easily repaired in just a few minutes. Other causes are signal interference, malfunctioning receiver modules or other electrical issues. The first thing to do is to ensure that the battery is running at the correct voltage and has been properly placed. The correct battery type is also vital. The internal circuitry of the device can be damaged in the event of using an unsuitable battery. the right size or polarized. It is also advisable to check the fuses to ensure they are not blown or have not melted. Another possible problem is that the transponder in the key could have been damaged or gone missing. This issue requires further diagnosis by a professional mechanic or dealer in cars. A lot of auto locksmiths and dealerships can reprogram a car's key fob at a cost, but this can be costly. If you have a spare, it might be worth attempting to reprogram the fob yourself. The instructions are usually found in the owner's manual. If you don't own the manual, you can locate instructions on the internet or on YouTube. It is essential to read the owner's manual prior attempting any repairs to the key fob.