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Fiat Panda Key Fob Replacement Fiat Panda key fobs contain a transponder chip which sends a signal to your car to unlock the doors or start the engine. The fob may stop working for a variety. The most common cause of 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 in case your key fob has failed. Use a brand new button battery with exactly the same size, voltage and specifications like the previous one. If the key fob was exposed to water (such as rain or saltwater at the beach) it should be cleaned prior to being used again. A paper towel soaked in isopropyl alcohol or electronic cleaner will work wonders. If fiat 500 key cover fob isn't working despite not being exposed water, it could be due to a glitch in the receiver module, or even in the internal electronic chip. Reprogramming the keyfob through an OBDII scan could help in these cases. Water Damage It is possible to get water damage if your key fob was submerged in a pool, puddle or washing machine. You can usually restore it's functionality by taking the battery off and cleaning the circuit board with isopropyl alcohol. It's a good idea let the fob dry completely before putting in 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. There are instructions for changing the programming of most remote keys on YouTube or consult your owner's manual. You can also reset the computer of your car using the OBDII scanner tool. Faulty Receiver Module The key fob is equipped with the chip that communicates with the vehicle's system. If the chip is damaged, it can no longer be able to send or receive signals to the vehicle. Dropping the key fob can result in this, as can exposure to water. If the key fob is not functioning after exposure to water, it could be possible to fix the issue by cleaning the chip using isopropyl alcohol or an electronic cleaner. If the key fob doesn't respond to cleaning, it is possible that the module has a fault and needs to be replaced. A damaged receiver can cause the key to stop working. This is usually caused by electromagnetic interference. Faulty Electronic Chip The chip inside your key fob plays a vital role in the anti-theft security system of your car. It transmits a message the immobiliser inside your car to determine that the key is valid. The car will not start when the chip is damaged. A defective chip could be caused by interference from objects, bad weather or transmitters in the vicinity of your vehicle. In this case, you will need an entirely new key fob. Contacts of the battery may be damaged. The battery contacts in a key fob are very delicate and could be damaged with hard usage. If they are bent, or broken, the fob won't send any signals to receiver modules inside the vehicle. Modern fobs come with rubber seals in order to keep out water. Immersing them in water, even if it is just a light drizzle or splash could harm the electronic chip. The key fob houses the chip that connects to the vehicle's immobilizer in order to activate it. It uses the old red keys in older vehicles, or the crypto coding system in newer vehicles. This chip will need to be replaced if it's defective. A faulty 12 Volt battery A damaged battery can cause the remote to cease working. The car's computer won't recognize the remote if this occurs. Before you replace the battery, test it using a an voltmeter for determining its capacity. A fully charged battery should display 12.6 volts. If the reading drops dramatically the time is now to replace it. Set an electrical load for a short time on the battery to test its capacity. This will take away 1% of the surface charges. Then measure the voltage again. The greater the battery's capacity and the longer it can keep its voltage. It is ideal to maintain close to 12 volts during several minutes. Faulty Radio Signal This is the most frequent cause of a key fob that ceases to send signals to the car. The battery can be replaced to solve this problem. It is important to buy batteries that have the same dimensions and voltage as the original. Fobs take a lot of abuse, but they're also not indestructible. Contacts on batteries and buttons can be damaged through rough handling. A signal can also be affected by other objects or transmitters which use the same frequency. A light control panel in your home, for example can interfere with key fobs that have the same frequency. This can interfere with the remote control of your car. Faulty OBDII scan tool There are a number of reasons why a scan tool may not work. Some are more complex than others. Professional scan tools enable mechanics to observe the car's network, and run various self-tests. These tools can save you a lot of time, but are costly and out of reach for the majority of DIYers. If your OBD2 scanner isn't turning on Check the voltage on terminal 16 (scan tool power) and terminal 4 (chassis ground). If both are in good condition, a fuse may have failed. This is the most common reason for failures of the scanner. The easiest solution is to replace the fuse that has been blown.