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Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder that sends a signal from the fob to the car to open doors or start the motor. However, the fob may stop working due to a variety of causes. A dead coin battery is the most frequent reason for key fob malfunctions. Other causes include water damage, a faulty module, and interference signals. Dead Coin Battery If the battery in your key fob is dead, the first thing to do is replace it. Make use of a button cell battery that has 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 on the beach, it will have to be cleaned before it is able to be used again. The best way to do this is using a paper towel that has been soaked in isopropyl, or electronic cleaner. If the key fob is not working even though it is not exposed to water it could be due to a glitch in the receiver module or internal electronic chip. In these instances you can reprogramme the key fob with an OBDII scanner may aid. Water Damage It is possible to get water damage if your key fob was submerged in a puddle, pool or washing machine. You can usually restore it's functionality by taking the battery off and cleaning the circuit board with isopropyl alcohol. It is best to let the circuit board completely dry prior to installing batteries. You could have a damaged module in the event that your key fob stops working after replacing the battery or reprogramming. You can find the instructions for changing the programming of most remote keys on YouTube or refer to the owner's manual. You could also try resetting the car's onboard computer with the OBDII scan tool. Faulty Receiver Module The key fob's chip is the chip that communicates with the car's system. The chip will stop sending and receiving signals to the car if damaged. This could be due to dropping the key fob, or through exposure to water. If the key fob is not functioning after exposure to water, it is possible to fix it by cleaning the chip with isopropyl alcohol or electronic cleaner. However, if the key fob continues to not respond after cleaning it, then it is likely that the module is defective and will need to be replaced. A faulty receiver module can also cause the remote control key to cease functioning. This is often caused by electromagnetic interference. Faulty electronic chip The electronic chip inside your key fob is a vital part in the anti-theft security system in your car. It sends a signal the immobiliser device in your vehicle to tell it whether or not the key is legitimate. If the chip is damaged or broken, your car will not start. A damaged chip could be caused by interference signals from other objects, bad weather conditions or transmitters on the same frequency in close proximity to your vehicle. In this case you'll require an entirely new key fob. Contacts to the battery are not working properly. The battery contacts of a key fob can be damaged by heavy usage. If they're bent or broken, the fob won't send any signals to receiver modules inside the vehicle. Modern fobs are made with rubber seals in order to keep out water. In the event of submerging them in water, even if just a light drizzle or splash could harm the chip's electronic components. The key fob houses a chip that communicates with the vehicle's immobilizer system in order to begin it. This system uses crypto coding systems in the latest vehicles or the red key system in older models. The chip must be replaced if damaged. The 12 Volt Battery is faulty A defective battery can cause the key fob not to work. When this occurs, the car's computer system will not recognize that the remote is inside the vehicle. Test the battery using an voltmeter prior to replacing it to determine its capacity. A fully charged battery should display 12.6 volts. If the reading falls significantly it is time to replace the battery. To test a battery's capacity, place an electrical load on it for a couple of minutes. This will eliminate 1% of the surface charges. Then, you can measure the voltage again. The higher the capacity of the battery is, the longer it will keep its voltage. Ideal is to hold close to 12 volts for several minutes. Faulty Radio Signal This is the most common reason for the key fob to stop sending signals to the car. The battery could be replaced to fix this problem. It is essential to purchase a battery with the same voltage and dimensions as the original. spare fiat 500 key to damage and can be damaged by a lot. The battery contacts and buttons could be damaged by rough handling. Other transmitters or objects that use the same frequency may also interfere with a signal. A light-control system in your home, for instance could interfere with key fobs that have the same bandwidth. This could interfere with the remote control of your car. Problems with OBDII Scan Tool There are many reasons why a scanner could not work. Certain are more complicated than others. Professional scan tools permit mechanics to examine the car's systems and perform a variety of self-tests. These can be real time savers but they can be expensive and are out of the budget of most DIYers. If your OBD2 scan tool fails to turn on, test the voltage at terminals 16 (scantool power) and 4 (chassis earth). If they are all OK the fuse could have been blown. This is one of the most common causes of failures in the scan tool. It is generally simple to fix the issue by replacing the fuse that was blown.