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Fiat Panda Key Fob Replacement Fiat Panda key fobs contain a transponder chip that sends the signal to your vehicle to open the doors or start the engine. However, the fob may stop working due to a variety of causes. A dead coin battery is the most common cause of malfunctioning keys. Other causes are water damage, the receiver module is defective, and signal interference. Dead Coin Battery If your key fob battery has died, the first step is to replace it. Choose a new button battery that is identical in size, voltage and specification as the original. If the key fob was exposed to water (such as rain or saltwater at the beach) It must be cleaned prior to being used again. The best method is to use a paper towel soaked with 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 problem in the receiver module or an internal electronic chip. In these situations it is possible that reprogramming the key fob with an OBDII scanner can assist. Water Damage If your key fob has taken immersed in a puddle or pool, or taken a trip down the wash machine, you might have some water damage. You can usually restore it's functionality by getting rid of the battery and scrubbing the circuit board with isopropyl alcohol. It is best to let the board completely dry before putting in a battery. If your key fob has stopped working, even after replacing the battery and changing the program, you could have a faulty receiver module. You can find information on changing the programming of most remote keys on YouTube, or consult your owner's manual. You could also try resetting the car's onboard computer by using 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 when it is damaged. A key fob falling off can result in this, as can water exposure. If your key fob isn't working due to exposure to water and you are unable to fix it by attempting to clean the chip with electronic cleaner or isopropylethanol. If the key fob does not respond to cleaning, it is likely that the module is in an issue and must be replaced. A damaged receiver can cause the key to cease to function. This is typically caused by electromagnetic interference. Faulty Electronic Chip The electronic chip inside your key fob is a crucial component of the anti-theft systems in your vehicle. It sends a signal to the immobiliser unit of your car to inform it whether the key is valid. The car won't start if the chip is damaged. A defective chip can be caused by interference signals from other objects, bad weather conditions or transmitters operating on the same frequency in close proximity to your car. In this case you'll need an entirely new key fob. Contacts of the battery may be damaged. The battery contacts in a key fob are very delicate and can get damaged through repeated use. If they're broken or bent, the fob will not send any signals to the receiver modules in the car. Modern fobs are made with rubber seals to keep out water. Submerging them in water, even if it's only the slightest splash or drizzle could damage the chip's electronic circuit. The key fob houses the chip that connects to the vehicle's immobilizer in order to allow it to start. The system is based on the old red keys in older vehicles or the cryptocoding system found in the latest vehicles. This chip will have to be replaced if faulty. The 12 Volt Battery is faulty A damaged battery could cause the key fob not to function. The car's system will not recognize the remote when this happens. Test the battery using the voltmeter before replacing it to determine its capacity. A fully charged battery should display 12.6 volts. If the reading falls significantly the time is now to replace it. To test the battery's power test the battery's capacity by placing an electrical load on it for a couple of minutes. This will eliminate 1percent of the surface charges. Then, you can measure the voltage. The higher the capacity of the battery, the longer it can maintain its voltage. It should be at or near 12 volts for several minutes. Faulty Radio Signal This is the most typical reason behind a key fob that ceases to send signals to the car. This problem can be solved by replacing the battery. It is however important to purchase a battery with the same voltage and size as the original one. The buttons are not impervious to destruction and can withstand a lot. The battery buttons and the contacts are fragile, so they can get bent or broken by rough usage. The signal could also be interrupted by other transmitters or objects which use the same frequency. A light-control system in your home, for instance could interfere with key fobs that use the same frequency. This can interfere with the remote control in your car. The tool is not working properly. OBDII scan tool There are a number of reasons why a scanner could not work. fiat 500 replacement key are more complex than others. Professional scan tools allow a mechanic to look over the car's networks and conduct a variety self-tests. These are real time savers, but they are also extremely expensive, and out of the range of most DIYers. If your OBD2 scanner won't start make sure you check the voltage at terminal 16 (scan tool power) and terminal 4 (chassis ground). If these are both present it's likely that a fuse has blown. This is among the most frequent causes of failures in the scan tool. The simple fix is usually to replace the fuse that is blowing up.