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Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder, which sends an electronic signal from the fob to the car in order to unlock doors or start the motor. However, the fob could stop working for several reasons. A dead coin battery is the most frequent reason for malfunctioning keys. Other causes include water damage a faulty receiver module and signal interference. Dead Coin Battery If the battery in your key fob is dead, the first step is to replace it. Use a button cell that has the same voltage, size and specifications as your previous one. If the key fob has been exposed to water, for example a splash of rain or salt water on the beach, it needs to be cleaned before it is able to be used again. The trick is to use an old towel soaked in isopropyl or an electronic cleaner. If the key fob has not been exposed to water, but remains inoperable it could be an issue with the receiver module or an internal electronic chip. Reprogramming the keyfob by using an OBDII scan can assist in these situations. Water Damage You might have water damage if your key fob was submerged in a pool, puddle or washing machine. It's possible to get it back in working order by taking the batteries off and cleaning the circuit board using ruby alcohol. It's best to let the board completely dry prior to installing batteries. It could be that you have a defective module if your key fob stops working after replacing the battery or replacing it with. You can find information on changing the programming of most remote keys on YouTube or consult your owner's manual. You could also try resetting the car's onboard computer using the OBDII scan tool. Faulty Receiver Module The key fob contains the chip that communicates the vehicle's system. If this chip becomes damaged, it will no longer be able to send or receive signals to the vehicle. This can be caused by dropping the key fob or by water exposure. If your key fob stopped working due to exposure to water it is possible to fix it if clean the chip with electronic cleaner or isopropyl alcohol. If the key fob does not respond even after cleaning it you can be sure that the receiver module is not functioning properly and will require to be replaced. A malfunctioning receiver could cause the key to stop working. This usually happens due to electromagnetic interference. Faulty electronic chip The electronic chip that is in your key fob plays a crucial role in the anti-theft system of your car. It transmits a message the immobiliser inside your car that tells it whether the key is legitimate. The car won't start when the chip is damaged. A defective chip can be caused by interference signals from other objects such as weather conditions, objects or transmitters on the same frequency in close proximity to your car. In this instance you'll need an entirely new key fob. Contacts to the battery are not working properly. The battery contacts on a key fob are very delicate and may be damaged through repeated use. If they are bent, or damaged, the fob will not transmit any signals to receiver modules in the vehicle. Modern fobs are equipped with rubber seals to keep out water. A splash of water or light rain is acceptable, but submerging them in salt water could harm the chip's electronic components. The key fob is equipped with chip that communicates with the immobilizer system of the vehicle to begin it. The system utilizes the old red keys for older vehicles as well as the cryptocoding system used in the latest vehicles. fiat key must be replaced if it's malfunctioning. Problematic 12 Volt Battery A defective battery can cause the key fob to function. When this occurs the car's computer won't recognize that the remote is in the vehicle. Before replacing the battery, you should test it with a an voltmeter to gauge its capacity. A fully charged battery should read 12.6 volts. If the reading drops significantly it is time to replace the battery. Set an electrical load for a short period of time on the battery to test its capacity. This will eliminate about 1 percent of the charge on the surface. Then take another measurement of the voltage. The better the battery's capacity, the longer it can keep its voltage. Ideally, it will remain close to 12 volts for several minutes. Radio Signal Faulty Radio Signal This is the most frequent reason for a key fob that ceases to send signals to the car. The battery is able to be replaced to resolve this problem. It is crucial to purchase batteries that have the same dimensions and voltage as the original. Fobs take a lot of abuse, but they're not impervious to destruction. The battery contacts and buttons could be damaged through rough handling. The signal could also be affected by other transmitters or objects which use the same frequency. A light control panel in your home, for instance could interfere with key fobs that use the same bandwidth. This could interfere with your car's remote control. The tool is not working properly. OBDII scan tool There are many reasons scanners don't function. Some are more complex than others. Professional scan tools enable a mechanic observe the car's network and run various self-tests. They can be huge time savers but they can also be very expensive, and out of the range of most DIYers. If your OBD2 scanner won't start Check the voltage on terminal 16 (scan tool power) and terminal 4 (chassis ground). If they're both in good shape the chances are that a fuse is blowing. This is the main cause of scan tool failure. The most straightforward fix is to replace the fuse that has been blown.