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Citroen C4 Key Fob Replacement The Citroen C4 Picasso is a compact SUV that is small enough for a family, and has several truly innovative features. It's spacious enough for five people, and is an excellent way to get around town. Sometimes, a key fob stops working due to pairing issues. If you follow the steps correctly, the issue will be fixed easily. However, a professional with specific equipment is required to fix certain types of vehicles. Dead coin battery A dead battery is the most frequent problem affecting remote key fobs. But, it's an easy fix. All you need to do is replace the battery in the coin. The batteries look like small silver coins, and can be purchased at your local automotive store. Once you've replaced the battery, then you'll be secure enough to lock and unlock your vehicle. Interference is another reason your key fob may not work. It can be caused by several factors, such as objects, weather conditions, or other transmitters using the same frequency. If this happens, it may be necessary to take out the ignition key and try again. Another reason why your key fob might not work could be because the fob is not programmed properly. This can happen if your key is exposed to water or it is not removed properly after replacing the battery. Typically, you can repair the car's programming by following the instructions provided in the owner's manual. If you're unable to do this, consult a professional locksmith dealer for assistance. Water damage The Citroen C4 is a highly reliable vehicle, but it's an auto with hundreds of interconnected components. Like any other car it is likely to have a breakdown from time to occasion. In some instances, the issue is fixable. In some cases, you may need to contact assistance or visit an expert. The most frequent reasons for the C4 key fob not functioning are a dead coin battery, water damages, signal interference and receiver module issues. Water damage can be caused by sweat or moisture on the circuit board. This could cause the circuit to become shorted, which can lead to a battery drain or a dead key fob. Keep your key fob out of the water and in the bag of plastic. A multimeter can be used to test the voltage of your battery. A successful test will produce numbers between 12 and 13 If your battery fails to produce these values, then it could be defective. This means you'll have to replace your battery. A malfunctioning receiver module A damaged receiver module may cause the key fob to stop working. Citroen owners often encounter this issue because the key fob needs to send an indication to the door handle in order to unlock the vehicle and start it. If the key fob is unable to transmit this signal, it won't work and must be replaced. This is typically handled by a mechanic or a dealership. There are a variety of things that can go wrong with your Citroen C4 key fob. This includes a dead coin battery, water damage, signal interference, or a defective electronic chip. To begin troubleshooting, check the key fob batteries and look for obvious indications. This can be done by opening the keyfob, then removing its battery to take a closer view. Replace the battery if drained. Make sure that the new battery is of the same voltage, size and specifications. Also, ensure that the fob is completely snapped together before replacing it. Faulty 12 volt battery Most newer cars come with key fobs that let you to lock and unlock your vehicle from some distance. These devices transmit a signal to the car to control the locks and operate on battery power. Batteries may fail over time. The good part is that the replacement battery is inexpensive and easy to replace. You can take the fob out using a flat-bladed screwdriver, or you could find instructions in the owner's manual. Replace the battery with a battery of the same size and type as the original. Different batteries may have different voltages which can cause your fob to stop working or display a low battery warning. Remember to also orient the battery in such a way that the plus and negative signs match the original orientation. This will ensure that the chip receives the correct signals. In other cases, the issue could be caused by a faulty receiver module. In G28CarKeys , it is recommended that you contact the dealer for further diagnosis and repairs. Unpaired key requiring reprogramming The remote for your car's ignition can fail to function due to various reasons. Fortunately, the majority of these problems can be fixed quickly and easily. Most of the time an inoperable coin-cell battery is the cause. This can be easily replaced in a couple of moments at most auto parts shops. It is essential that the new battery be installed correctly. Metal clips for retaining must be properly tightened and contacts of the battery should be cleaned. A defective receiver module or signal interference is another possibility. If the key fob is not receiving a sufficient signal from the receiver, it may not be able to lock or unlock doors and start the car or use the hands-free system. In these instances you can reset the receiver by dismantling the battery for a couple of minutes. Smart keys, which have an integrated security chip that disarms the vehicle's immobiliser system They are more expensive than traditional metal keys and can cost upwards of $500 to replace. To avoid these costly costs it's a good idea to have at minimum two working keys for your C4. The replacement remote key fob is rebuilt and tested with brand new internal components before it is sent to you.