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If your citroen c3 key's key fob stops working all of a sudden it could be due a defective receiver module. If the key fob still operates it could be because of another issue, such as water damage or a dead battery.

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Dead coin battery

If the unlock button on the key fob does't work, it could mean that the battery in the coin is damaged. The battery should last between three and four years with regular use but it is possible to die abruptly. The car manufacturers have designed fail-safes that allow you to unlock and start the vehicle even if the key fob is dead.

The battery in a key fob is usually held in place by metallic clips that form the circuit. The battery may not be powered if the clips are dirty or worn. The battery should be the correct size and type. If the battery is too small or large, it will not fit on the fob and won't function properly.

Batteries for key fobs are sold under a variety of names, including CR2016 and even CR2032. These are not interchangeable. Read the owner's guide for your particular model or look for a sticker on the fob with the information.

Once you've got the right battery you can replace it in a matter of seconds. Most fobs feature a slider, gap, or switch that you can use to break open the cover and swap out the old battery to get an alternative. Be sure that the new battery is of the same voltage as the old one and that it is inserted correctly.

Water damage

Even the case that your key fob escaped the wash cycle or an immersion in the pool, it isn't suitable for electronics. It can cause damage to the chip and ruin a battery. Fortunately, there are a few actions you can take to minimize the damage.

It's crucial to first eliminate the battery and then dry out the interior as possible. You can also clean the battery using a cotton swab which is dipped in 90 percent alcohol.

After you've cleaned your key fob, wait for a few days to completely dry. You can speed it up by placing it high on a shelf so that it doesn't get smashed. When you're certain that it's bone dry put in a new battery and running it as usual.

If the key fob isn't working, it could have a faulty receiver module that isn't able to transmit signals to your car. It can be costly to repair, but it's worth trying to avoid having to buy a new one.

The easiest method to fix a damaged key fob, is to replace the battery. The radio signal should be restored and your key fob should work again after changing the battery. If the issue persists and you are unable to resolve it, you should seek professional assistance.

Faulty receiver module

In some instances the key fob's reception module may have a defect that is preventing it from receiving or transmitting the correct signal. In this scenario the car will not recognize the remote control key. It won't unlock or start. In this scenario the replacement remote control is required.

Read the owner's manual before attempting to reprogram the key fob yourself. Ensure that the battery of the key fob is in good shape and that all buttons are functioning. Close the doors and remove any aftermarket devices such as alarms or radios from your vehicle.

You can also try cleaning the chip with isopropyl Alcohol or electronic cleaner. If the chip has become 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. Once the contacts are dry, you can put them back together and test the key fob. If it's not working you might need to replace the battery. Make sure you choose a new battery that provides the same voltage as the old one. Verify the battery's position because the contact points are very sensitive.

Faulty keyless entry systems

The key fob is an excellent convenience for cars, but it can be frustrating when it ceases to function. It's usually easy to get your key fob back functioning. A dead battery for the coin is the most frequent reason for a malfunctioning fob. It can be replaced in a matter of minutes. Other causes include signal interference malfunctioning receiver modules and other electrical issues.

The first step is to ensure that the battery is correctly placed and has the proper voltage. The correct type of battery is also crucial. If you use a battery that is not properly sized or polarized batteries could harm the internal circuitry. You should also examine the fuses to make sure they aren't blown out or haven't melted.

Another possibility is that the transponder contained in the key could be damaged or lost. This is a scenario that will require further diagnostics by a dealer in the car or professional mechanic.

A lot of auto locksmiths and dealerships can reprogram a car's key fob for a small fee, but it can be costly. If you have an extra, it could be worth trying to reprogram the fob yourself. The instructions are usually found in the owner's manual. If you don't have the manual, you can look up instructions online or on YouTube. Before attempting to fix the key fob, it is essential to read the owner's manual.