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Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder, which sends signals from the fob to the car that allows it to unlock doors or start the motor. However, the fob may be inoperable due to various reasons. A dead coin battery is the most common cause of malfunctioning keys. Other causes are water damage or a damaged module and interference signals. Dead Coin Battery If the battery in your key fob has gone out of service, the first step is to replace it. Choose a new button battery that has the same voltage, size and specifications as the old one. If the key fob has been exposed to water, such as a splash of rain or salt water at the beach, it's going to need to be cleaned before it is able to be used again. A paper towel soaked with isopropyl alcohol or electronic cleaner will work wonders. If the key fob hasn't been exposed to water, but remains inoperable, there may be an issue with the receiver module or an internal electronic chip. In these instances you can reprogramme the key fob using an OBDII scanner might aid. Water Damage There could be water damage to your key fob if it was submerged in a pool, puddle or washing machine. It's generally possible to get it back in working order by getting rid of the batteries and cleaning the circuit board with rubbing alcohol. It is a good idea to let the fob dry completely before installing a new battery. If your key fob has stopped working even after replacing the battery and reconfiguring it, you may have a faulty receiver module. You can find the instructions for reprogramming most vehicles' remote keys on YouTube or in the owner's manual. You can also reset your computer in your car with the OBDII scanner tool. Faulty Receiver Module The key fob is equipped with a chip that communicates with the vehicle's system. If this chip becomes damaged, it will be unable to longer send and receive signals to the vehicle. A key fob falling off can result in this, as can exposure to water. If the key fob stops working after exposure to water it could be possible to repair the issue by cleaning or cleaning the chip with isopropyl alcohol, or 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 defective receiver can cause the key to stop working. This is usually due to electromagnetic interference. A defective electronic chip The chip inside your key fob is a vital part in the anti-theft security system of your car. It sends a signal the immobiliser device in your car to inform it whether the key is in fact valid. If the chip is damaged or broken, your vehicle will not start. A malfunctioning chip could be caused by interference signals from objects like bad weather conditions or transmitters on the same frequency in close proximity to your vehicle. In this case, you will need an entirely new key fob. Contacts for the battery that are defective The battery contacts on the key fob could be damaged through heavy use. If they are bent, or broken, the fob won't send any signals to receiver modules inside the vehicle. Modern fobs are constructed with rubber seals in order to keep out water. Submerging them in water, even if just small splash or drizzle could harm the chip's electronic circuit. The key fob houses an electronic chip that communicates with the vehicle's immobilizer to allow it to begin it. This system uses crypto coding systems in the latest vehicles and the older red key system in older models. This chip will have to be replaced if faulty. Faulty 12 Volt Batterie A damaged battery can cause the remote to stop working. The car's system will not recognize the remote if this occurs. Test the battery with a voltmeter before replacing it to determine its capacity. A fully charged battery should read 12.6 volts. If the reading falls significantly the time is now to replace it. To determine the capacity of a battery, place an electrical load on it for a few minutes. This will eliminate 1percent of the charges. Then measure the voltage again. The Keylab is, the longer it will maintain its voltage. Ideal is to hold close to 12 volts over several minutes. Faulty Radio Signal This is the most typical reason for the key fob not sending signals to the car. This problem can be solved by replacing the battery. It is crucial to buy a battery that has the same voltage and dimensions as the original. Fobs are not indestructible and are susceptible to damage. The battery contacts and buttons could be damaged through rough handling. A signal may also be interrupted by other objects or transmitters who use the same frequency. For instance, a light-control panel in your home could send interference over the same bandwidth that key fobs utilize. This can interfere with the remote control in your car. Faulty OBDII Scan Tool There are many reasons why a scan tool may not work. Certain are more complicated than others. Professional scan tools enable mechanics to monitor the car's network, and run various self-tests. These tools can save time, but are costly and not accessible to most DIYers. If your OBD2 scanner won't turn on examine the voltage at terminal 16 (scan tool power) and terminal 4 (chassis ground). If these are OK it's likely that a fuse has failed. This is among the most frequent causes of scan tool failure. It is typically easy to fix the problem by replacing the blown fuse.