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Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder, which sends a signal from the fob to the car to open doors or start the motor. The fob may stop working for a variety of reasons. A dead coin battery is the most common reason for the malfunction of a key fob. Other causes include water damage, a faulty module, and interference signals. Dead Coin Battery If your key fob's battery has failed, the initial thing to do is replace it. Use a new button cell battery that is identical in size, voltage and specification as the old one. If the key fob was exposed to water (such as rain or saltwater at the beach) it must be cleaned before using again. The best way to do this is using an old towel soaked in isopropyl or an electronic cleaner. If the key fob hasn't been exposed to water, but isn't working it could be a problem with the receiver module or an internal electronic chip. Reprogramming the keyfob using an OBDII scan can assist in these situations. Water Damage If your key fob has gotten immersed in a puddle or pool or walked to the washing machine, you may have some water damage. It's usually possible to restore it's functionality by getting rid of the battery and scrubbing the circuit board with isopropyl alcohol. It's best to let the circuit board completely dry prior to installing the battery. If your key fob has stopped working, even after replacing the battery and reprogramming it, you may have a faulty receiver module. You can find the instructions for reprogramming most vehicles' remote keys on YouTube or in your owner's manual. You can also try resetting the car's onboard computer using the OBDII scan tool. Faulty Receiver Module The key fob has an electronic chip that communicates with the vehicle's system. This chip will stop sending and receiving signals to the car if damaged. This can be caused by dropping the key fob, or by exposure to water. If the key fob stops working after exposure to water it may be possible to fix it by cleaning the chip with isopropyl alcohol, or electronic cleaner. If the key fob does not respond to cleaning, it is possible that the module has a fault and needs to be replaced. TheKeyLab can cause the key to stop working. This is often caused by electromagnetic interference. Faulty Electronic Chip The electronic chip in your key fob is an essential part of the anti-theft system in your vehicle. It sends a signal the immobiliser unit of your car to inform it whether the key is genuine. Your car will not start in the event that the chip is damaged. A damaged chip could be caused by interference from other objects, weather conditions or transmitters in the vicinity of your vehicle. In this case you'll require a new key fob. Contacts to the battery are not working properly. The battery contacts on the fob's key can be damaged due to heavy use. If they are bent, or broken, the fob won't send any signals to the receiver modules inside the vehicle. Modern fobs are made with rubber seals to keep out water. Immersing them in water, even if it's only an occasional drizzle or splash can harm the chip's electronic components. The key fob has a chip that communicates with the vehicle's immobilizer in order to begin it. The system is based on the red keys of older vehicles, or the cryptocoding system used in modern vehicles. This chip will have to be replaced if it's defective. A faulty 12 Volt battery A defective battery can cause the remote to cease to function. The car's computer won't recognize the remote if this happens. Before you replace the battery, test it by using a an voltmeter for determining its capacity. A fully charged battery should read 12.6 volts. If the reading decreases significantly, it's time to replace it. Set an electrical load for a short time on the battery to determine its capacity. This will eliminate 1percent of the surface charges. Then take another measurement of the voltage. The better the battery's capacity, the longer it can maintain its voltage. It is ideal to maintain at or near 12 volts for several minutes. Radio Signal Faulty Radio Signal This is the main reason behind a key fob that ceases to send signals to the car. This issue can be resolved by replacing the battery. It is essential to purchase a battery with the same voltage and dimensions as the original. Fobs take a lot of abuse, and they aren't indestructible. Contacts on batteries and buttons can be damaged by rough handling. A signal may also be interrupted by other objects or transmitters who use the same frequency. For example, a light-control panel in your home could send interference on the same bandwidth that key fobs use. This could affect the remote control of your car. Afflicted OBDII scan tool There are many reasons scanners don't perform. Some are more complex than others. Professional scan tools enable mechanics to monitor the car's network and run a range of self-tests. These tools can save you a lot of time, but are expensive and out of reach for the majority of DIYers. If your OBD2 scan tool fails to turn on, check the voltage at the terminals 16 (scantool power) and 4 (chassis earth). If they are all OK, a fuse may have blown. This is one of the most frequent causes of scan tool failure. The easiest solution is to replace the fuse that is blowing up.