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Fiat Panda Key Fob Replacement Fiat Panda key fobs contain a transponder chip which sends an alert to your car to unlock the doors or start the engine. However, the fob can be inoperable due to various reasons. The most common reason for key fob failure is a dead coin battery. Other causes include water damages or a damaged module and interference signals. Dead Coin Battery Replace the battery if the key fob has failed. Choose a new button battery with identical in size, voltage and specifications as the original. If the key fob was exposed to water, like a splash of rain or salt water at the beach, it needs 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 has not been exposed to water, but remains inoperable, there may be a problem with the receiver module or an internal electronic chip. Reprogramming the keyfob by using an OBDII scan may help in these cases. Water Damage If your key fob has taken immersed in a pool or puddle or gone through the washing machine, you might have some water damage. It's possible to get it working by taking out the batteries and cleaning the circuit board using rubbing alcohol. It's best to allow the fob to dry completely before installing a new battery. If your key fob stopped working, even after replacing the battery and programming it again, you might have a defective receiver module. You can find the instructions for reprogramming most vehicles' remote keys on YouTube or consult the owner's manual. You can also try resetting the car's computer onboard using the OBDII scan tool. Faulty Receiver Module The key fob contains a chip that connects to the car's system. If this chip becomes damaged, it will no longer send and receive signals to the vehicle. This could be due to dropping the key fob, or by exposure to water. If your key fob isn't functioning due to exposure to water it is possible to fix it by attempting to clean the chip using electronic cleaner or isopropyl alcohol. However, if the key fob does not respond even after cleaning it you can be sure that the receiver module is not functioning properly and will need to be replaced. A faulty receiver can also cause the key to stop working. This is usually caused by electromagnetic interference. Faulty Electronic Chip The electronic chip inside the key fob is a crucial part of the anti-theft system in your car. It sends a signal to the immobiliser device in the vehicle to determine whether the key is legitimate. Your car will not start when the chip is damaged. A damaged 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 scenario an upgrade to the fob will be needed. Contacts to the battery are not working properly. The battery contacts of a key fob are very delicate and may be damaged by repeated use. If they are damaged or bent, the key fob will not be able to send any signals to the receiver modules in the car. Modern fobs come with rubber seals in order to keep out water. Submerging them in water, even if it is just the slightest splash or drizzle can harm the chip's electronic circuit. The key fob has a chip which communicates with the immobilizer system of the vehicle to start it. This system makes use of cryptocoding systems in modern vehicles or the red key system in older ones. This chip needs to be replaced if defective. Poor 12 Volt Battery A defective battery can cause the key fob to cease working. The car's system will not recognize the remote if this happens. Test the battery with the help of a voltmeter to determine its capacity. A fully charged battery will read 12.6 volts. If the reading drops significantly then it's time to replace it. To test a battery's capacity put an electrical load on it for a few minutes. This will eliminate one percent of the surface charges. Then, you can measure the voltage. The longer a battery can hold its voltage and the higher its capacity. It should be at 12 volts or less for several minutes. Faulty Radio Signal This is the most typical reason behind a key fob that stops sending signals to the car. This problem can be solved by replacing the battery. It is however important to purchase a battery that is the same size and voltage as the original one. Fobs aren't indestructible and can withstand a lot. The battery contacts and buttons could be damaged by rough handling. Other transmitters or objects using the same frequency may also disrupt a signal. For example, a light-control panel that is near your home could send interference on the same bandwidth that key fobs utilize. This could interfere with the remote control in your car. Incorrect OBDII scan tool There are many reasons why scanner tools may not work. Certain are more complicated than others. spare key fiat 500 let mechanics to look over the car's network, and run various self-tests. These tools can help save time, but they are costly and not accessible to most DIYers. If your OBD2 scanner doesn't work, check the voltage on terminal 16 (scan tool power) and terminal 4 (chassis ground). If these are both present it's possible that a fuse has failed. This is among the most frequent reasons for failure of the scanner. The easiest solution is to replace the fuse which has blown.