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Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder which transmits an indication from the fob to the car that allows it to unlock doors or turn on the motor. The fob can stop functioning for a variety of reasons. car key cover fiat 500 of key fob malfunction is the battery of the coin is dead. Other causes are water damage, the receiver module is defective and signal interference. Dead Coin Battery Replace the battery in case your key fob is dead. Use a button cell with the same voltage, size and specifications as the old one. If the key fob was exposed to water (such as saltwater or rain at the beach), it must be cleaned prior to being used again. A paper towel that has been soaked in isopropyl alcohol or electronic cleaner will help. If the key fob is not working despite being not exposed to water, it could be due to a malfunction in the receiver module or in the internal electronic chip. Reprogramming the keyfob by using an OBDII scan could help in these cases. Water Damage If your key fob's battery has taken a bath in the puddle or pool or gone down the washing machine, you could be suffering some water damage. You can usually restore it's functionality by taking the battery off and cleaning the circuit board with isopropyl alcohol. It's a good idea allow the fob to dry completely prior to installing a new battery. If your key fob stopped working even after replacing the battery and programming it again, you might have a defective receiver module. You can find information on the reprogramming of most remote keys on YouTube or consult the owner's manual. You could also try resetting the car's computer onboard using the OBDII scan tool. Faulty Receiver Module The key fob's chip is the chip that communicates the vehicle's system. If this chip becomes damaged, it will no longer send and receive signals to the vehicle. The key fob being dropped can cause this, as can exposure to water. If your key fob isn't functioning due to exposure to water or water exposure, you might be able to fix it by attempting to clean the chip using electronic cleaner or isopropylethanol. However, if the key fob continues to not respond even after cleaning it you can be sure that the module is faulty and will require to be replaced. A malfunctioning receiver module could also cause the remote control key to cease functioning. This is usually due to electromagnetic interference. A malfunctioning electronic chip The electronic chip inside your key fob is an essential component of the anti-theft systems in your car. It sends a message to the immobiliser in your car to determine that the key is valid. If the chip is damaged or broken, your vehicle won't start. A faulty chip can also be caused by interference signals from other objects, bad weather conditions or transmitters on the same frequency in close proximity to your vehicle. In this situation, a new fob will be needed. Contacts for the battery that are defective The battery contacts of a key fob are very fragile and are susceptible to damage through repeated use. If they're bent, or damaged, the fob will not send any signals to receiver modules in the vehicle. Modern fobs feature rubber seals that keep out water. A splash of water or light rain is fine however, submerging them in saltwater may cause damage to the electronic chip. The key fob comes with chip that communicates with the immobilizer system of the vehicle, allowing it to start it. This system utilizes cryptocoding systems in newer vehicles, or the old red key system for older models. This chip needs to be replaced if it's defective. Problematic 12 Volt Battery A damaged battery can cause the remote to cease to function. When this happens the car's computer will not be able to recognize that the remote is inside the vehicle. Test the battery using an voltmeter prior to replacing it to determine its capacity. A fully charged battery should read 12.6 volts. If the reading decreases significantly it is time to replace the battery. To test a battery's capacity put an electrical load on it for a couple of minutes. This will remove about 1% of the surface charge. Then take another measurement of the voltage. The longer the battery is able to hold its voltage, the better its capacity. Ideal is to hold at or near 12 volts for several minutes. Faulty Radio Signal This is the most frequent reason for a key fob that stops sending signals to the car. The battery is able to be replaced to resolve this problem. It is important to buy a battery that has the same dimensions and voltage as the original. The buttons are not impervious to destruction and can take a lot. The battery contacts and buttons are delicate and are susceptible to being bent or damaged by excessive use. A signal can also be impacted by other transmitters or objects who use the same frequency. A light-control panel at your home, for instance, may interfere with key fobs that have the same bandwidth. This could interfere with the remote control of your car. Afflicted OBDII Scan Tool There are many reasons why a scan tool may not work. Some are more complicated than others. Professional scan tools allow a mechanic to observe the car's networks and run a variety of self-tests. They can be huge time-savers, but they are also extremely expensive and are out of the budget of many DIYers. If your OBD2 scan tool doesn't turn on, test the voltage at terminals 16 (scantool power) and 4 (chassis earth). If all is fine, a fuse may have been blown. This is the most frequent reason for failure of the scan tool. The simple fix is usually to replace the blown fuse.