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fiat ducato key fob contain a transponder chip which sends a signal to your car to unlock the doors or start the engine. However, the fob can stop working due to a variety of causes. A dead battery for the coin is the most frequent cause of key fob malfunctions. Other causes are water damage, malfunctioning receiver modules and signal interference. Dead Coin Battery If your key fob battery has died, the first thing to do is replace it. Choose a button battery with the same voltage, size and specification as your old one. If the key fob was exposed to water, such as a splash of rain or salt water at the beach, it needs to be cleaned before it can be used again. The best method is to use an old towel soaked in isopropyl or electronic cleaner. If the key fob is not working despite not being exposed water it could be due to a malfunction in the receiver module or internal electronic chip. In these instances it is possible that reprogramming the key fob with an OBDII scanner might aid. Water Damage You could have water damage if your key fob was submerged in a pool, puddle or washing machine. It is usually possible to get it working by taking out the batteries and cleaning the circuit board with ruby alcohol. It's a good idea let the fob dry completely prior to installing a new battery. You could have a damaged module in the event that your remote stops working after replacing the battery or changing the programming. You can find instructions for reprograming the majority of remote keys on YouTube or consult the owner's manual. You can also reset your computer of your car using the OBDII scanner tool. Faulty Receiver Module The key fob's chip is an electronic chip that communicates with the car's system. If the chip is damaged, it cannot longer send and receive signals to the vehicle. This could be due to dropping the key fob, or due to exposure to water. If the key fob stopped functioning after exposure to water, it could be possible to repair the issue by cleaning or cleaning the chip using isopropyl alcohol or an electronic cleaner. If the key fob does not respond to cleaning, it's possible that the module has issues and needs to be replaced. A damaged receiver module may also cause the remote control key to not function. This is usually due to electromagnetic interference. Faulty electronic chip The electronic chip in your key fob is a vital part of the anti-theft system in your vehicle. It sends a signal to the immobiliser device in the vehicle to determine whether or not the key is in fact valid. Your car won't start when the chip is damaged. A faulty chip may also be caused by interference from objects, bad weather or transmitters located near your vehicle. In this situation an upgrade to the fob will be required. Faulty Battery Contacts The battery contacts inside a key fob are very delicate and could be damaged through repeated use. If they are bent, or damaged, the fob will not send any signals to the receiver modules in the vehicle. Modern fobs are equipped with rubber seals that block out water. In the event of submerging them in water, even if it is just small splash or drizzle can harm the chip's electronic circuit. The key fob contains an electronic chip that communicates with the vehicle's immobilizer system to start it. The system is based on the red keys of older vehicles or the cryptocoding system found in newer vehicles. If the chip is defective it must be replaced. Faulty 12 Volt Batterie A defective battery can cause the remote to stop working. The car's computer won't recognize the remote when this occurs. Before replacing the battery, you should test it with a an voltmeter to gauge its capacity. A fully charged battery should read 12.6 volts. If the reading drops significantly then it's time to replace it. Install an electrical charge for a few seconds on the battery to gauge its capacity. This will eliminate approximately 1% of the surface charge. Then, test the voltage once more. The greater the battery's capacity, the longer it can keep its voltage. It is ideal to maintain close to 12 volts during several minutes. Faulty Radio Signal This is the main reason for keys not sending signals to cars. The battery could be replaced to fix this problem. But, it is essential to purchase a battery with the same size and voltage as the original. Fobs aren't impervious to damage and can be damaged by a lot. The battery buttons and contacts are delicate, so they can get bent or broken by excessive use. Other transmitters or objects using the same frequency may also interfere with the signal. For instance, a light-control panel close to your home can transmit interference on the same frequency that key fobs use. This can affect the remote control of your car. Incorrect OBDII Scan Tool There are many reasons scanners don't work. Certain are more complicated than others. Professional scan tools allow a mechanic to look over the car's networks and perform a variety of self-tests. These can be real time savers, however they can also be very expensive, out of the range of most DIYers. If your OBD2 scan tool won't power on, check voltage at terminals 16 (scantool power) and 4 (chassis earth). If they're both in good shape the chances are that a fuse has blown. This is the most typical reason for a scan tool to fail. It is generally easy to fix the problem by replacing the fuse that has blown.