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fiat keys replacement are equipped with a transponder, which sends an electronic signal from the fob to the car that allows it to unlock doors or turn on the motor. The fob can stop functioning due to a variety of reasons. A dead battery for the coin is the most common cause of malfunctioning keys. Other causes include water damages or a damaged module and interference signals. Dead Coin Battery If your key fob's battery has gone out of service, the first step is to replace it. Use a new button cell battery that is the same voltage, size, and specification like the previous one. If the key fob was exposed to water, like a splash of rain or salt water on the beach, it will have to be cleaned before it can be used again. A paper towel soaked with isopropyl alcohol or electronic cleaner will work wonders. If the key fob isn't working despite not being exposed to water it could be due a malfunction in the receiver module, or even in the internal electronic chip. In these situations, reprogramming the key fob using an OBDII scanner can aid. Water Damage There could be water damage if your key fob was submerged in a pool, puddle or washing machine. It's generally possible to get it back in working order by removing the batteries and cleaning the circuit board with rubbing alcohol. It's best to let the fob dry completely before putting in a brand new battery. You may have a faulty module when your key fob ceases working after replacing the battery or updating. You can find reprogramming instructions for most vehicles' remote key fobs on YouTube or in the owner's guide. You can also reset the computer in your car with the OBDII scanner tool. Faulty Receiver Module The key fob contains the chip that communicates the vehicle's system. The chip will stop sending and receiving signals to the car when it is damaged. A key fob falling off can cause this, as could water exposure. If the key fob you have purchased has stopped working due to water exposure and you are unable to fix it if you clean the chip with electronic cleaner or isopropyl alcohol. However, if the key fob does not respond after cleaning it, then it is likely that the module is faulty and will need to be replaced. A damaged receiver module may also cause the remote control key to stop working. This is usually due to electromagnetic interference. Faulty Electronic Chip The electronic chip inside your key fob is a vital function in the anti-theft security system of your car. It sends out a signal the immobiliser unit inside your vehicle to tell it whether the key is legitimate. If the chip is damaged or broken, the car will not start. A defective chip could be caused by interference caused by objects, bad weather or transmitters in the vicinity of your vehicle. In this instance, a new fob will be needed. Contacts to the battery are not working properly. The battery contacts on the key fob could be damaged by heavy usage. If they are broken or bent, the fob will not transmit any signals to the receiver modules inside the car. Modern fobs are designed with rubber seals to keep out water. A splash of water or a light rain is fine but submerging them into saltwater could damage the chip's electronic components. The key fob houses the chip that connects to the vehicle's immobilizer system in order to activate it. This system makes use of cryptocoding systems in vehicles that are more modern as well as the traditional red key system in older ones. If this chip is faulty it must be replaced. Problems with 12 Volt Batteries A damaged battery could cause the key fob to function. When this occurs the car's computer will not recognize that the remote is within the vehicle. Test the battery using a voltmeter before replacing it to determine its capacity. A fully charged battery will display 12.6 volts. If the reading falls significantly then it's time to replace the battery. To test the battery's power, place an electrical load on it for a couple of minutes. This will take away approximately 1% of the surface charge. Then take another measurement of the voltage. The better the battery's capacity, the longer it can keep its voltage. Ideal is to hold at or near 12 volts for several minutes. The radio signal is not working properly. Radio Signal This is the most typical reason for a key fob that stops sending signals to the car. The battery could be replaced to fix this problem. But, it is essential to choose a battery that is the same voltage and size as the original one. Fobs take a lot of abuse, and they aren't impervious to destruction. The battery buttons and the contacts are fragile and are susceptible to being bent or damaged from the force of. The signal could also be affected by other objects or transmitters who use the same frequency. A light control panel in your home, for instance can interfere with key fobs using the same bandwidth. This could interfere with the remote control of your car. Faulty OBDII Scan Tool There are many reasons why scanner tools may not work. Certain are more complicated than others. Professional scan tools enable a mechanic observe the car's networks and run various self-tests. These are great time savers, but they can be expensive and are out of the range of most DIYers. If your OBD2 scan tool isn't turning on, check the voltage at terminals 16 (scantool power) and 4 (chassis earth). If they're both in good shape it's likely that a fuse has been blown. This is one of the most common causes of a scan tool failing. It is generally simple to fix the issue by replacing the fuse that was blown.