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Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder that sends a signal from the fob to the car that allows it to unlock doors or start the motor. The fob could stop working due to a variety reasons. The most frequent cause of key fob failure is a dead coin battery. Other causes include 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. Use a brand new button battery that is the same size, voltage 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 soaked in alcohol or electronic cleaner will be the solution. If the key fob is not working despite not being exposed to water, it could be due to a problem in the receiver module or internal electronic chip. Reprogramming the keyfob by using an OBDII scan may aid in these situations. Water Damage There could be water damage if your key fob was submerged in a pool, puddle or washing machine. It's usually possible to get it back to working by taking the battery off and cleaning the circuit board with isopropyl alcohol. It is best to allow the device to completely dry before installing the battery. If your key fob isn't working even after replacing the battery and changing the program, you could have a defective receiver module. Reprogramming instructions are available for the majority of vehicles' remote key fobs on YouTube or in your owner's guide. You can also reset the car's computer using the OBDII scanner tool. Faulty Receiver Module The key fob has the chip that communicates with the car's system. If this chip becomes damaged, it will be unable to longer transmit and receive signals to the vehicle. The key fob being dropped can result in this, as can water exposure. If the key fob is not working after water exposure it could be possible to fix it by cleaning the chip with isopropyl ethanol or electronic cleaner. If the key fob doesn't respond to cleaning, it is possible that the module has issues and needs to be replaced. A faulty receiver module can also cause the remote control key to not function. This is usually due to electromagnetic interference. Faulty electronic chip The chip that is embedded in the key fob is an important element of the anti-theft device in your vehicle. It sends a signal the immobiliser unit in your vehicle to tell it whether or not the key is valid. If fiat 500 key fob is damaged or broken, the car will not start. A malfunctioning chip could be caused by interference signals from objects such as weather conditions, objects or transmitters operating on the same frequency near your vehicle. In this scenario, a new fob will be required. Contacts with the battery may be damaged. The battery contacts of the fob's key can be damaged by excessive usage. If they're broken or bent, the fob will not transmit any signals to the receiver modules inside the car. Modern fobs are equipped with rubber seals that keep out water. In the event of submerging them in water, even if it's just small splash or drizzle, can damage the chip's electronic components. The key fob has the chip that connects to the vehicle's immobilizer to allow it to activate it. The system relies on cryptocoding systems in the latest vehicles and the older red key system for older ones. If the chip is defective, it will need to be replaced. Problems with 12 Volt Batteries A malfunctioning battery could cause the key fob to cease to function. When this happens the car's computer won't recognize that the remote is in the vehicle. Test the battery with an voltmeter prior to replacing it to determine its capacity. A fully charged battery will display 12.6 volts. If the reading falls significantly it is time to replace the battery. Install an electrical charge for a few moments on the battery to check its capacity. This will eliminate about 1% of the charge on the surface. After that, take the voltage once more. The better the battery's capacity, the longer it can keep its voltage. It is ideal to maintain close to 12 volts for several minutes. Radio Signal Faulty Radio Signal This is the most frequent cause of a key fob that stops sending signals to the car. The battery can be replaced to fix this issue. It is however important to purchase a battery with the same size and voltage as the original one. Fobs are subject to a lot of punishment, and aren't indestructible. 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 objects or transmitters that operate on the same frequency. For example, a light-control panel close to your home can transmit interference on the same frequency that key fobs utilize. This can affect the remote control of your car. Afflicted OBDII scan tool There are many reasons scanners don't perform. Some are more complicated than others. Professional scan tools let mechanics to look over the car's network, and run various self-tests. They can be huge time-savers, but they are also extremely expensive, and beyond the budget of many DIYers. If your OBD2 scan tool won't power on, check the voltage at terminals 16 (scantool power) and 4 (chassis earth). If both are in good condition it's possible that a fuse is blowing. This is one of the most frequent causes of failures in the scan tool. The simple fix is usually to replace the blown fuse.