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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 open the doors or start the engine. However, the fob could stop working due to a variety of causes. A dead battery for the coin is the most common reason for the malfunction of a key fob. Other causes are water damage, a faulty receiver module and signal interference. Dead Coin Battery Replace the battery if the key fob is dead. Use a brand new button battery with the same size, voltage and specifications as the previous one. If the key fob was exposed to water, such as a splash of rain or salt water on the beach, it will have to be cleaned before it can be used again. A paper towel soaked in isopropyl alcohol or electronic cleaner will help. If the key fob is not working even though it is not exposed to water it could be due a malfunction in the receiver module, or even in the internal electronic chip. In these instances, reprogramming the key fob using an OBDII scanner might aid. Water Damage You might have water damage if your key fob was submerged in a pool, puddle or washing machine. It is usually possible to be able to get it back up and running by removing the battery and scrubbing the circuit board with isopropyl alcohol. It is a good idea to let the fob dry completely before installing a new battery. There could be a problem with the module when your key fob ceases working after replacing the battery or changing the programming. There are reprogramming guidelines for most vehicles' remote key fobs on YouTube or in your owner's guide. You can also reset your computer of your car using the OBDII scanner tool. fiat key cover is equipped with an electronic chip that communicates with the car's system. This chip will stop sending and receiving signals to the car if it becomes damaged. Dropping the key fob can cause this, as can water exposure. If your key fob has stopped functioning due to exposure to water and you are unable to fix it if you clean the chip with electronic cleaner or isopropyl ethanol. If the key fob continues to not respond following cleaning, you can be sure that the module is defective and will require to be replaced. A damaged receiver can cause the key to cease to function. This is usually due to electromagnetic interference. Electronic chip that is malfunctioning The electronic chip in your key fob plays a crucial role in the anti-theft security system of your vehicle. It transmits a message to the immobiliser in your car to tell it whether the key is legitimate. Your car won't start if the chip is damaged. A defective chip could be caused by interference from other objects, weather conditions or transmitters located near your vehicle. In this scenario you'll need an entirely new key fob. Contacts to the battery are not working properly. The battery contacts on a key fob can be damaged through heavy use. If they're damaged or bent, the fob won't send any signals to the receiver modules in the car. Modern fobs come with rubber seals to keep out water. In the event of submerging them in water, even if it is just a light drizzle or splash could damage the chip's electronic circuit. The key fob is equipped with an electronic chip that communicates with the immobilizer system of the vehicle, allowing it to start it. This system uses crypto coding systems in vehicles that are more modern, or the old red key system for older models. If the chip is defective it must be replaced. The 12 Volt Battery is faulty A faulty battery can cause the key fob to cease to function. The car's computer will not recognize the remote if this occurs. Test the battery using the help of a voltmeter to determine its capacity. A fully charged battery should read 12.6 volts. If the reading drops significantly, it is time to replace the battery. To determine the capacity of a battery, place an electrical load on it for a few minutes. This will take away 1percent of the charges. Then take another measurement of the voltage. The greater the battery's capacity and the longer it can keep its voltage. It is ideal to maintain close to 12 volts over several minutes. Problems with Radio Signal This is the most common reason for the key fob not sending signals to a car. The battery can be replaced to fix this issue. However, it is important to select a replacement battery with the same size and voltage as the original. Fobs are subject to a lot of abuse, but they're not impervious to destruction. Contacts and buttons on batteries can be damaged by rough handling. Other transmitters or objects using the same frequency may also disrupt a signal. A light-control panel in your home, for example can interfere with key fobs that use the same frequency. This could cause interference with your car's remote control. The tool is not working properly. OBDII scan tool There are a number of reasons why a scan tool may not work. Some are more complicated than others. Professional scan tools let mechanics to look over the car's networks and run various self-tests. These tools can save you a lot of time, but are expensive and are out of reach for most DIYers. If your OBD2 scanner doesn't work make sure you check the voltage at terminal 16 (scan tool power) and terminal 4 (chassis ground). If they're all fine the fuse could have blown. This is among the most common causes of scan tool failure. It is usually easy to fix the issue by replacing the blown fuse.