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Fiat Panda Key Fob Replacement Fiat Panda key fobs contain transponder chips that send signals to your car to open the doors or start the engine. However, the fob can not function due to a variety of reasons. The most common reason for key fob malfunction is a dead coin battery. Other causes include water damages as well as a defective module and interference signals. Dead Coin Battery If your key fob battery has died, the first thing to do is replace it. Choose a new button battery with the same size, voltage, and specification as the previous one. If the key fob was exposed to water (such as saltwater or rain at the beach) it should be cleaned prior to using it again. The best solution is to use an old towel soaked in isopropyl or an electronic cleaner. If the key fob hasn't been exposed to water, but remains inoperable it could be due to a problem with the receiver module or an internal electronic chip. Reprogramming the keyfob with an OBDII scan could help in these instances. Water Damage You could have water damage to your key fob if it was submerged in a puddle, pool or washing machine. It is usually possible to restore it's functionality by getting rid of the battery and scrubbing the circuit board with isopropyl alcohol. It's a good idea allow the fob to dry completely before putting in a new battery. If your key fob stopped working even after replacing the battery and reconfiguring it, you may have a defective receiver module. You can find instructions for reprogramming most vehicles' remote keys on YouTube or in the owner's manual. You can also reset the computer in your car with the OBDII scanner tool. Faulty Receiver Module The key fob contains the chip that communicates the vehicle's system. If this chip becomes damaged, it will be unable to longer send and receive signals to the vehicle. Dropping the key fob could cause this, as well as exposure to water. If the key fob is not working after water exposure it could be possible to repair it by cleaning the chip using isopropyl alcohol or electronic cleaner. If replacement key for fiat 500 does not respond to cleaning, it's possible that the module has an issue and should be replaced. A malfunctioning receiver module could also cause the remote control key to not function. This is typically caused by electromagnetic interference. Electronic chip that is malfunctioning The electronic chip that is in your key fob plays an important role in the anti-theft security system in your car. It sends a signal to the immobiliser inside your car to inform it that the key is valid. Your car won't start in the event that the chip is damaged. A damaged chip could be caused by interference signals from other objects or weather conditions that are bad, or transmitters operating on the same frequency as your car. In this scenario you'll need an entirely new key fob. Contacts for the battery that are defective The battery contacts of the fob's battery can be damaged by heavy usage. If they're broken or bent, the fob will not be able to send any signals to the receiver modules in the car. Modern fobs are made with rubber seals that keep out water. A splash of water or light rain should be fine However, submerging them in saltwater can harm the chip's electronic components. The key fob is equipped with an electronic chip that communicates with the vehicle's immobilizer system in order to allow it to start. The system utilizes the red keys of older vehicles, or the cryptocoding system found in the latest vehicles. The chip must be replaced if malfunctioning. 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 be able to 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 will read 12.6 volts. If the reading falls dramatically then it's time to replace the battery. Put an electrical load for a short time on the battery to determine its capacity. This will remove about 1 percent of the surface charge. Then, test the voltage once more. The better the battery's capacity, the longer it can maintain its voltage. Ideally, it will remain close to 12 volts several minutes. The radio signal is not working properly. Radio Signal This is the most common reason for a key fob to stop sending signals to vehicles. The battery can be replaced to solve this problem. But, it is essential to buy a new battery with the same voltage and size as the original. Fobs aren't impervious to damage and can be damaged by a lot. Battery contacts and buttons can be damaged by rough handling. Other transmitters or objects that use the same frequency can interfere with a signal. A light-control panel in your home, for instance can interfere with key fobs which use the same frequency. This can interfere with the remote control of your car. Faulty OBDII scan tool There are many reasons why a scan tool could not function. Certain are more complicated than others. Professional scan tools allow a mechanic to examine the car's systems and perform a variety of self-tests. These are great time savers but they can be expensive, out of the budget of many DIYers. If your OBD2 scan tool doesn't turn on, test the voltage at terminals 16 (scantool power) and 4 (chassis earth). If these are both present it's possible that a fuse has been blown. This is the most frequent reason for a scan tool to fail. It is generally simple to fix the issue by replacing the blown fuse.