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If your C3 key fob suddenly stopped functioning, it could be because of a faulty module. If the key fob is functional, the issue could be caused by something else, like water damage or a dead battery for the coin.

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Dead coin battery

If the key fob's unlock button doesn't functioning, there could be an issue with the coin battery. The battery is expected to last between three and four years with regular use but it can fail in a sudden manner. Luckily, citroen car key makers have built-in fail-safes so that you can still start and lock your vehicle even if the key fob has a dead battery.

The battery in the key fob is secured with clips made of metal, which complete the circuit. The battery might not be powered if these clips are dirty or worn. The battery should also be the right size and type. The battery will not fit into the fob if it's too big or too small.

Batteries for key fobs are available under various names such as CR2016, and even CR2032. They are not interchangeable. The best way to determine the type to buy is to refer to your owner's manual, or look at the fob for an inscription that contains the specific information.

Once you've found the correct battery, it can be replaced in a matter of seconds. Most fobs have a slider gap, or switch that you can use to pop open the cover and exchange the old battery to get an alternative. Make sure the new one is the same size and voltage, and that it is placed in the correct direction.

Water damage

Water is bad for electronics even if they've been through a wash cycle or a dip. It can cause damage to the chip, and even destroy a battery. Fortunately, there are a few actions you can take to minimize the damage.

It is important to first take out the battery, then dry out the interior as much as you can. You can also make use of a cotton swab that has been that has been dipped in 90 percent isopropyl alcohol to cleanse the battery and circuit board.

After you've cleaned your key fob, wait several days for it to completely dry out. You can accelerate the process by placing it on a high shelf that won't be disturbed. After you've confirmed that it is bone dry, try replacing the battery and running it in the same way as you normally would.

If the key fob doesn't work, you may have a malfunctioning receiver module that's not transmitting signals to your vehicle. It can be expensive to fix, but is worth it if you don't need to replace your car.

The easiest method to fix a broken key fob is to change the battery. The radio signal should be restored and your key fob should work once you replace the battery. If the issue continues, you should seek professional assistance.

Faulty receiver module

In some cases, the key fob's receiver module could be defective that stops it from receiving and transmitting the correct signal. If this is the case, your car won't recognize your remote control and will not be able to unlock or start the engine. In this case you'll have to purchase an alternative.

Consult your owner's guide before attempting to reprogram the key fob yourself. Make sure the battery of the key fob is in good shape and that all buttons are functioning. Also, shut the doors and disconnect any aftermarket devices like alarm systems or radios from the vehicle.

You may also try cleaning the chip with isopropyl alcohol or electronic cleaner. If the chip has become damaged it is likely to need to be replaced.

After cleaning the key fobs, remove the circuit board. Then, clean the contacts using alcohol swabs, and let them dry. After the contacts are dry then you can reassemble and test the key fob. If the key fob does not work, it may be required to replace the battery. Choose a replacement battery that has the same voltage that the original battery. It's recommended to double-check that the battery is placed in the correct position and that the contact points are extremely sensitive.

Keyless entry system malfunctions

The key fob is a great convenience for cars, but it can be frustrating when it ceases to function. The good news is that the majority times it's easy to get it working again. A dead battery for the coin is the most common reason for a fob that is malfunctioning. It can be replaced within minutes. Other causes include signal interferance or a malfunctioning module and other electrical problems.

The first step is to ensure that the battery is properly inserted and has the right voltage. The correct battery type is also essential. Using an incorrectly sized or polarized battery could damage the internal circuitry. Also, you should check the fuses to make sure they are not blown or have not melted.

Another possibility is that the transponder within the key could be damaged or even lost. This issue will require further investigation by a qualified mechanic or a dealer for cars.

Auto locksmiths and dealers will reprogram the key fob of vehicles for a small fee. However this can be expensive. If you have an extra key, it may be worth trying to reprogram the fob yourself. You will usually find the instructions in the owner's manual. If you don't have a manual, you can look up instructions online or on YouTube. Before attempting to repair the key fob, it's crucial to consult the owner's guide.