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Fiat Panda Key Fob Replacement Fiat Panda key fobs contain a transponder chip which sends signals to your car to open the doors and start the engine. The fob can stop functioning for a variety. A dead coin battery is the most frequent cause of the malfunction of a key fob. Other causes are water damage, a faulty module, and interference signals. Dead Coin Battery If your key fob battery is dead, the first step is to replace it. Use a new button cell battery that is identical in size, voltage, and specification like the previous one. If the key fob was exposed to water (such as saltwater or rain at the beach) it must be cleaned prior to using it again. A paper towel soaked in alcohol or electronic cleaner will help. If the key fob isn't working despite not being exposed water it could be due to a problem in the receiver module, or even in the internal electronic chip. Reprogramming the keyfob by using an OBDII scan could help in these cases. Water Damage If your key fob took a bath in the puddle or pool or walked down the wash machine, it could have some water damage. It's usually possible to restore it's functionality by taking off the battery and then scrubbing the circuit board with isopropyl alcohol. It's best to let the fob dry completely prior to installing a new battery. If your key fob has stopped working even after replacing the battery and changing the program, you could have a defective receiver module. You can find reprogramming instructions for most remote key fobs on YouTube or in your owner's guide. You can also reset your computer in your car with the OBDII scanner tool. Faulty Receiver Module The key fob's chip is an electronic chip that communicates with the vehicle's system. If this chip becomes damaged, it can no longer transmit or 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 working after exposure to water, it is possible to repair it by cleaning the chip using isopropyl alcohol or an electronic cleaner. If the key fob continues to not respond following cleaning, it is likely that the module is defective and will need to be replaced. A faulty receiver can also cause the key to stop working. This is usually due to electromagnetic interference. A defective electronic chip The electronic chip inside your key fob is a crucial part of the anti-theft system in your car. It transmits a signal to the immobiliser unit of the vehicle to determine whether the key is valid. If the chip is damaged or broken, your vehicle will not start. A defective chip could be caused by interference from other objects, bad weather or transmitters near your vehicle. In this case you'll require an entirely new key fob. Contacts with the battery may be damaged. The battery contacts in the key fob are fragile and are susceptible to damage by repeated use. If they're bent, or broken, the fob won't transmit any signals to receiver modules inside the vehicle. Modern fobs are constructed with rubber seals to keep out water. Submerging them in water even if it's just an occasional drizzle or splash could harm the chip's electronic components. The key fob houses a chip that communicates with the vehicle's immobilizer in order to allow it to start. The system is based on the old red keys for older vehicles, or the crypto coding system in newer vehicles. If G28 Car Keys is damaged it will have to be replaced. Faulty 12 Volt Battery A malfunctioning battery could cause the key fob to cease working. When this happens the car's computer won't recognize that the remote is inside the vehicle. Test the battery with an voltmeter prior to replacing it to determine its capacity. A fully charged battery should display 12.6 volts. If the reading drops dramatically the time is now to replace it. Install an electrical charge for a few seconds on the battery to gauge its capacity. This will remove 1percent of the surface charges. Then, measure the voltage once more. The greater the battery's capacity and the longer it can keep its voltage. Ideal is that it stays at or near 12 volts for several minutes. Faulty Radio Signal This is the most frequent reason behind a key fob that ceases to send signals to the car. The battery is able to be replaced to resolve this problem. It is important to buy a battery with the same voltage and dimensions as the original. The buttons are not impervious to destruction and are susceptible to damage. Contacts and buttons on batteries can be damaged by rough handling. Other transmitters or objects using the same frequency could also interfere with the signal. For example, a light-control panel in your home could transmit interference on the same bandwidth that key fobs use. This could interfere with the remote control in your car. Afflicted OBDII Scan Tool There are many reasons why a scan tool might not work. Some are more complex than others. Professional scan tools allow mechanics to observe the car's networks and run a variety of self-tests. These are great time savers but they're also expensive, and out of the budget of most DIYers. If your OBD2 scan tool fails to turn on, check the voltage at the terminals 16 (scantool power) and 4 (chassis earth). If they're all fine it could be that a fuse has failed. This is the most typical reason for failure of the scan tool. The easiest solution is to replace the fuse that is blowing up.