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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 in order to unlock doors or turn on the motor. The fob might stop working due to a variety of reasons. The most common cause of key fob failure is a dead coin battery. Other causes are water damage, malfunctioning receiver modules and signal interference. Dead Coin Battery If your key fob battery is dead, the first thing to do is replace it. Make use of a 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 saltwater or rain at the beach) it must be cleaned before using again. A paper towel soaked with isopropyl alcohol or electronic cleaner will help. If the key fob doesn't working despite not being exposed water it could be due a malfunction in the receiver module, or even in the internal electronic chip. In these instances it is possible to re-programme the key fob with an OBDII scanner can aid. Water Damage You might have water damage if your key fob was submerged in a pool, puddle or washing machine. You can usually get it back to working by removing the battery and scrubbing the circuit board with isopropyl alcohol. It is recommended to allow the device to completely dry before putting in batteries. If your key fob isn't working even after replacing the battery and changing the program, you could have a malfunctioning receiver module. You can find information on the reprogramming of most remote keys on YouTube or refer to the owner's manual. You can 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. The chip will stop sending and receiving signals to the car if damaged. This can be caused by dropping the key fob or due to exposure to water. If the key fob stops working after exposure to water, it could be possible to fix it by cleaning the chip using isopropyl alcohol or an electronic cleaner. If the key fob does not respond to cleaning, it is possible that the receiver module has an issue and must be replaced. A damaged receiver module may also cause the remote control key to stop working. This usually happens due to electromagnetic interference. Faulty Electronic Chip The electronic chip in your key fob is a vital role in the anti-theft system of your car. It sends out a signal the immobiliser unit in your car to inform it whether the key is in fact valid. Your car won't start in the event that the chip is damaged. A damaged chip could be caused by interference signals from objects or weather conditions that are bad, or transmitters operating on the same frequency in close proximity to your vehicle. In this scenario, you will need a new key fob. Faulty battery contacts The battery contacts of the fob's key can be damaged by excessive usage. If they're damaged or bent, the key fob won't send any signals to the receiver modules in the car. Modern fobs have rubber seals that keep out water. Immersing them in water, even if it's just small splash or drizzle could harm the chip's electronic circuit. The key fob contains a chip that communicates with the vehicle's immobilizer system to activate it. This system makes use of cryptocoding systems in the latest vehicles and the older red key system used in older models. This chip will have to be replaced if malfunctioning. The 12 Volt Battery is faulty A defective battery can cause the key fob to work. If this happens the car's computer won't recognize that the remote is within the vehicle. 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 test a battery's capacity, place an electrical load on it for a couple of minutes. This will take away approximately 1% of the charge on the surface. Then, you can measure the voltage. The longer the battery can keep its voltage steady, the better its capacity. 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 the car. This problem can be solved by replacing the battery. It is crucial to purchase batteries that have the same dimensions and voltage as the original. Fobs are not indestructible and can take a lot. Contacts and buttons on batteries can be damaged by rough handling. fiat replacement key or objects operating on the same frequency could also interfere with a signal. For example, a light-control panel close to your home can transmit interference using the same frequency that key fobs use. This could interfere with the remote control of your car. Problems with OBDII Scan Tool There are many reasons why a scanner might not work. Certain are more complicated than others. Professional scan tools enable mechanics to look over the car's networks and run a variety of self-tests. These tools can save time, but are costly and are out of reach for the majority of DIYers. If your OBD2 scanner isn't turning on Check the voltage on terminal 16 (scan tool power) and terminal 4 (chassis ground). If these are both present, it's likely that a fuse is blowing. This is the most frequent reason for failure of the scan tool. The easiest fix is to replace the fuse which has blown.