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Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder that transmits signals from the fob to the car to open doors or turn on the motor. The fob might stop working for a variety. The most common reason for key fob failure is the battery of the coin is dead. Other reasons include water damage, an inoperative receiver module, and signal interference. Dead Coin Battery Replace the battery in case your key fob has gone out of service. Choose a button battery with 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 at the beach, it's going to need to be cleaned before it can be used again. A paper towel soaked with isopropyl alcohol or electronic cleaner will work wonders. If the key fob hasn't been exposed to water, but still does not work it could be an issue with the receiver module or an internal electronic chip. Reprogramming the keyfob by using an OBDII scan can help in these instances. Water Damage There could be water damage to your key fob if it was submerged in a puddle, pool or washing machine. It is usually possible to restore it's functionality by taking off the battery and then scrubbing the circuit board with isopropyl alcohol. It's best to allow the device to completely dry before installing batteries. If your key fob has stopped working even after replacing the battery and changing the program, you could have a problem with the receiver module. You can find reprogramming instructions for most vehicles' remote key fobs on YouTube or in the owner's manual. You could also try resetting the car's onboard computer by using the OBDII scan tool. Faulty Receiver Module The key fob has a chip which communicates with the vehicle's system. This chip will stop sending and receiving signals to the car when it is damaged. Dropping the key fob can cause this, as could exposure to water. If the key fob stops working after exposure to water it is possible to fix the issue by cleaning the chip with isopropyl alcohol or electronic cleaner. However, if the key fob does not respond even after cleaning it it is likely that the module is defective and will need to be replaced. A faulty receiver can also cause the key to cease to function. This is typically caused by electromagnetic interference. Faulty Electronic Chip The chip that is embedded in your key fob is an important part of the anti-theft system in your vehicle. It transmits a message the immobiliser inside your car to tell it whether the key is legitimate. The car won't start if the chip is damaged. A defective chip could be caused by interference caused by objects, bad weather or transmitters near your vehicle. In this situation an upgrade to the fob will be needed. Contacts to the battery are not working properly. The battery contacts of the key fob could be damaged due to heavy use. If they are broken or bent, the fob won't send any signals to the receiver modules inside the car. Modern fobs are designed with rubber seals that keep out water. A splash of water or light rain is fine, but submerging them in saltwater could cause damage to the electronic chip. The key fob contains a chip that communicates with the vehicle's immobilizer system to start it. The system relies on cryptocoding systems in modern vehicles as well as the traditional red key system in older models. If the chip is damaged it will have to be replaced. A faulty 12 Volt battery A malfunctioning battery could cause the key fob not to work. If this happens, the car's computer system cannot recognize that the remote is within the vehicle. Before you replace the battery, test it with an voltmeter to gauge its capacity. A fully charged battery should read 12.6 volts. If the reading decreases significantly, it's time to replace it. Put an electrical load for a few moments on the battery to test its capacity. This will remove 1% of the surface charges. Then, measure the voltage once more. The better the battery's capacity is, the longer it will maintain its voltage. Ideally, it should remain at or near 12 volts for several minutes. Problems with Radio Signal This is the most common reason for the key fob not sending signals to cars. The battery can be replaced to solve this problem. It is essential to purchase batteries that have the same dimensions and voltage as the original. Fobs are subject to a lot of punishment, and aren't indestructible. Contacts and buttons on batteries can be damaged through rough handling. fiat 500 key fob replacement or objects using the same frequency could also disrupt a signal. For instance, a light control panel in your home could transmit interference on the same frequency as key fobs use. This could interfere with the remote control of your car. Faulty OBDII scan tool There are a number of reasons why a scan tool might not work. Some are more complicated than others. Professional scan tools allow a mechanic to examine the car's systems and conduct a variety self-tests. These are great time savers, but they are also extremely expensive, and out of the budget of many DIYers. If your OBD2 scanner won't turn on, check the voltage on terminal 16 (scan tool power) and terminal 4 (chassis ground). If they're all fine there is a chance that a fuse has failed. This is the main reason for failures of the scanner. It is generally simple to fix the issue by replacing the fuse blowing up.