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Fiat Panda Key Fob Replacement Fiat Panda key fobs contain an transponder chip that transmits the signal to your vehicle to unlock the doors or start the engine. The fob may stop working due to a variety of reasons. The most common reason for key fob failure is the battery of the coin is dead. Other causes include water damage or a damaged module and interference signals. Dead Coin Battery Replace the battery if the key fob is dead. Use a brand new button battery with exactly the same size, voltage, and specification as the previous one. If the key fob was exposed to water (such as rain or saltwater at the beach) It must be cleaned before using again. A paper towel soaked in isopropyl alcohol or electronic cleaner will help. If the key fob isn't working despite not being exposed water it could be due to a malfunction in the receiver module, or even in the internal electronic chip. In these situations it is possible that reprogramming the key fob with an OBDII scanner could assist. Water Damage If your key fob has gotten immersed in a puddle or pool or walked through the washing machine, you may have some water damage. It is usually possible to get it back in working order by taking the batteries off and cleaning the circuit board with rubbing alcohol. It's best to let the circuit board completely dry before putting in a battery. There could be a problem with the module if your key fob stops working after replacing the battery or updating. You can find information on the reprogramming of most remote keys on YouTube or refer to your owner's manual. You could also try resetting the car's onboard computer with the OBDII scan tool. Faulty Receiver Module The key fob's chip is a chip that communicates with the car's system. This chip will stop sending and receiving signals to the car if it becomes damaged. This can be caused by dropping the key fob or by water exposure. If the key fob is not working after exposure to water it could be possible to repair it by cleaning the chip using isopropyl alcohol, or electronic cleaner. If the key fob won't respond to cleaning, it is possible that the component has a fault and needs to be replaced. A damaged receiver can cause the key to not work. This is usually caused by electromagnetic interference. Electronic chip that is malfunctioning The electronic chip in the key fob is a vital component of the anti-theft systems in your car. It sends a message to the immobiliser in your car to determine whether the key is legitimate. If the chip is damaged or broken, your car won't start. A malfunctioning chip can be caused by interference from other objects, weather conditions or transmitters near your vehicle. In this case you'll require an entirely new key fob. Contacts to the battery are not working properly. The battery contacts on the fob's key can be damaged by excessive usage. If they're bent, or damaged, the fob will not transmit any signals to receiver modules inside the vehicle. Modern fobs are made with rubber seals to keep out water. In the event of submerging them in water, even if it's only the slightest splash or drizzle could damage the electronic chip. The key fob comes with a chip which communicates with the immobilizer system of the vehicle to start it. fiat key cover utilizes cryptocoding systems in modern vehicles, or the old red key system used in older ones. If the chip is not working properly and needs to be replaced. Faulty 12 Volt Battery A defective battery can cause the key fob to function. The car's computer will not recognize the remote when this occurs. 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 decreases significantly it is time to replace the battery. Place an electrical load for a short time on the battery to test its capacity. This will take away approximately 1% of the surface charge. Then take another measurement of the voltage. The better the battery's capacity and the longer it can keep its voltage. It should be at 12 volts or less for several minutes. Faulty Radio Signal This is the most common cause of a key fob that stops sending signals to the car. The battery could be replaced to fix this issue. It is however important to choose a battery that has the same size and voltage as the original. Fobs can take a lot abuse, and they aren't indestructible. The battery buttons and contacts are delicate, so they can get bent or damaged by excessive use. Other objects or transmitters using the same frequency may also interfere with a signal. For instance, a light-control panel close to your home can send interference on the same frequency as key fobs use. This could affect 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 complicated than others. Professional scan tools let a mechanic observe the car's networks and run various self-tests. These tools can save a lot of time, but are expensive and out of reach for the majority of 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 possible that a fuse has failed. This is among the most common causes of failures in the scan tool. The simple fix is usually to replace the blown fuse.