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Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder that transmits signals from the fob to the car to open doors or turn on the motor. However, the fob could stop working due to a variety of causes. A dead battery for the coin is the most common reason for a key fob malfunction. Other causes include 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 with the same size, voltage and specifications as the old one. If the key fob was exposed to water, like a splash of rain or salt water on the beach, it needs to be cleaned before it can be used again. A paper towel soaked in isopropyl alcohol or electronic cleaner can do the trick. If the key fob has not been exposed to water but remains inoperable it could be a problem with the receiver module or an internal electronic chip. Reprogramming the keyfob by using an OBDII scan can help in these cases. Water Damage You could have water damage to your key fob if it was submerged in a puddle, pool or washing machine. It's usually possible to get it working by getting rid of the batteries and cleaning the circuit board with rubbing alcohol. It is best to let the board completely dry before installing batteries. If your key fob isn't working, even after replacing the battery and reconfiguring it, you may have a malfunctioning receiver module. Reprogramming instructions are available for most remote key fobs on YouTube or in the owner's guide. You can also reset the computer of your vehicle using the OBDII scanner tool. Faulty Receiver Module The key fob contains a chip that communicates with the car's system. If spare key fiat 500 becomes damaged, it cannot longer be able to send 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 stops working after water exposure it may be possible to repair the issue by cleaning or cleaning the chip using isopropyl ethanol or electronic cleaner. However, if the key fob continues to not respond after cleaning it, there is a good chance that the receiver module is not functioning properly and must be replaced. A defective receiver module could also cause the remote control key to stop functioning. This usually happens due to electromagnetic interference. Faulty Electronic Chip The electronic chip that is in your key fob plays an important part in the anti-theft security system of your car. It sends 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 can be caused by interference signals from objects like bad weather conditions or transmitters operating on the same frequency close to your car. In this situation you'll need a new key fob. Contacts for the battery that are defective The battery contacts in the key fob are delicate and may be damaged by repeated use. If they are bent, or broken, the fob won't send any signals to the receiver modules in the vehicle. Modern fobs are designed with rubber seals that keep out water. Submerging them in water, even if just an occasional drizzle or splash, can damage the electronic chip. The key fob has chips that communicate with the vehicle's immobilizer in order to activate it. The system relies on cryptocoding systems in the latest vehicles as well as the traditional red key system for older models. This chip will need to be replaced if malfunctioning. Faulty 12 Volt Battery A defective battery can cause the key fob to stop working. The car's computer will not recognize the remote when this occurs. Test the battery using an voltmeter prior to replacing it to determine its capacity. A fully charged battery will read 12.6 volts. If the reading falls dramatically then it's time to replace the battery. To test a battery's capacity test the battery's capacity by placing an electrical load on it for a few minutes. This will eliminate approximately 1 percent of the surface charge. Then, you can measure the voltage once more. The longer the battery is able to hold its voltage more effectively, the greater its capacity. Ideally, it should remain close to 12 volts several minutes. The radio signal is not working properly. Radio Signal This is the main reason for the key fob not sending signals to a car. This problem can be solved by replacing the battery. However, it is important to choose a battery that is the same voltage and size as the original. Fobs aren't impervious to damage and can take a lot. Contacts and buttons on batteries can be damaged through rough handling. Other transmitters or objects using the same frequency may also disrupt the signal. A light-control system in your home, for instance can interfere with key fobs using the same bandwidth. This could interfere with the remote control of your car. Afflicted OBDII scan tool There are a variety of reasons why scanners don't function. Certain are more complicated than others. Professional scan tools allow a mechanic to monitor the car's network and conduct a variety self-tests. These can be real time savers, but they're also expensive, and beyond the reach of most DIYers. If your OBD2 scan tool won't power on, check the voltage at terminals 16 (scantool power) and 4 (chassis earth). If they're all fine the fuse could have blown. This is the main reason for a scan tool to fail. It is often easy to fix the issue by replacing the fuse blowing up.