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If the key fob on your C3 stopped suddenly, it could be due to a malfunctioning receiver module. If the key fob remains functional, the issue may be due to something else, such as water damage or a dead coin battery.
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Dead coin battery
If the key fob’s unlock button isn’t functioning, there could be a problem with the battery of the coin. The battery should last between three and four years with regular use but it is possible to die in a sudden manner. The car manufacturers have designed fail-safes that let you lock and start your car even if your key fob is dead.
The battery inside the key fob is held in place by metal clips that form a circuit. The battery might not be able to run if these clips are dirty or worn. The battery must also be the right size and type. If the battery is too small or too large it will not fit into the fob and won’t work properly.
Key fob batteries are usually sold under various names, such as CR2016 and CR2032 (though these are not interchangeable). Consult your owner’s guide or look for a label on the fob which contains the details.
Once you’ve found the correct battery, it can be replaced in just a few moments. Most fobs feature a slider, switch, or gap that you can use to break open the cover and exchange the old one for the new one. Make sure that the new battery is of the same voltage as the old one and is inserted correctly.
Water damage
Water can be harmful to electronics even if they’ve survived an wash cycle or dip. It can ruin batteries and cause serious damage to the electronic chip inside. Fortunately, there are some ways to limit the damage.
It’s important to first remove the battery, then dry out the interior as much as you can. You can also clean the battery by using a cotton-swab that has been dipped in 90 percent alcohol.
After you’ve cleaned the key fob, wait several days for it to completely dry out. You can speed the process up by placing it on a shelf, so it isn’t disturbed. Once you are sure that the battery is totally dry, replace it with an additional battery and continue using it as usual.
If your key fob still not working it could be because the receiver module in your car is defective and cannot transmit signals. It’s costly to repair, but worth it if you don’t need to replace your car.
The most straightforward way to fix a broken key fob is to change the battery. The radio signal should be restored and your key fob will work once you replace the battery. If the issue continues, you should seek professional assistance.
Faulty receiver module
In some instances there are instances where a flaw in the receiver module of the key fob can cause it to stop receiving or transmitting the correct signals. In this case, the car will not recognize the remote control key. It will not unlock or start. In this scenario you’ll need another replacement.
Consult your owner’s guide before attempting to reprogram the key fob on your own. The first step is to ensure that the battery in the key fob is in good health and that all of its buttons are functioning. Close the doors and remove any other devices from the aftermarket, such as alarms or radios from your vehicle.
You can also clean the chip with isopropyl 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. Clean the contacts using alcohol swabs and allow them to dry. Once the contacts are dry then you can reassemble the key fob and test it. If the key fob still isn’t working, it might be necessary to replace the battery. Make sure you choose a battery with the same voltage that the original battery. Verify the battery’s position since the contact points are very sensitive.
A malfunctioning keyless entry system
The key fob is a great convenience in cars However, it can be frustrating when it stops working. It’s usually easy to get your key fob working. A dead battery for the coin is the most common reason for a broken fob. This can be easily repaired in just a few minutes. Other causes are signal interference, a bad module and other electrical issues.
The first step is to ensure that the battery is of the correct voltage and that it is correctly put in. The correct type of battery is also crucial. If you use a wrongly sized or polarized one could cause damage to the internal circuitry. It is also advisable to check the fuses to make sure they’re not blown or have not melted.
A transponder inside the key may be damaged or absent. This is a situation that will require further diagnosis by a dealer in the car or a professional mechanic.
Auto locksmiths and dealers will reprogram the key fob on vehicles for a small fee. However it can be expensive. If you have a spare, it might be worthwhile to try reprogramming the fob yourself. In most cases, you’ll get instructions from the owner’s manual. If you don’t own the manual, you can locate instructions online or on YouTube. It is important to consult the owner’s manual prior to making any repairs on the key fob.