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Fiat Panda Key Fob Replacement Fiat Panda key fobs contain an transponder chip that transmits an alert to your car to unlock the doors or start the engine. However, the key fob may not function due to a variety of reasons. The most common cause of key fob failure is the battery of the coin is dead. Other causes are water damage or a damaged module and interference signals. Dead Coin Battery Replace the battery if the key fob is dead. Make use of a new button battery with the same voltage, size and specification like the previous one. If the key fob was 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 is able to be used again. A paper towel that has been soaked in isopropyl alcohol or electronic cleaner will be the solution. If the key fob hasn't been exposed to water but still does not work it could be because of a problem with the receiver module or an internal electronic chip. Reprogramming the keyfob 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 pool, puddle or washing machine. It's usually possible to fix it by taking the batteries off and cleaning the circuit board with ruby alcohol. It's best to let the fob completely dry prior to installing a battery. If your key fob stopped working, even after replacing the battery and programming it again, you might have a problem with the receiver module. You can find information on changing the programming of most remote keys on YouTube, or consult your owner's manual. You can also reset your computer of your vehicle using the OBDII scanner tool. Faulty Receiver Module The key fob has an electronic chip that communicates with the vehicle's system. If the chip is damaged, it will be unable to longer transmit or receive signals to the vehicle. This can be caused by dropping the key fob or through exposure to water. If your key fob has stopped working due to water exposure, you may be able to fix it by attempting to clean the chip using electronic cleaner or isopropyl alcohol. If the key fob does not respond following cleaning, you can be sure that the component is damaged and will require to be replaced. fiat keys could cause the key to stop working. This is typically caused by electromagnetic interference. Electronic chip that is malfunctioning The electronic chip in your key fob plays an important role in the anti-theft security system of your vehicle. It sends a signal the immobiliser unit of your vehicle to tell it whether the key is valid. Your car won't start when the chip is damaged. A damaged chip could be caused by interference signals from objects, bad weather conditions or transmitters operating on the same frequency close to your car. In this situation, you will need a new key fob. Contacts for the battery that are defective The battery contacts of a key fob can be damaged due to heavy use. If they're bent, or damaged, the fob will not transmit any signals to receiver modules inside the vehicle. Modern fobs come with rubber seals that keep out water. A splash of water or a light rain is acceptable however, submerging them in saltwater could cause damage to the chip's electronic components. The key fob comes with a chip which communicates with the immobilizer system of the vehicle, allowing it to start it. It uses the old red keys in older vehicles or the cryptocoding system that is used in newer vehicles. This chip needs to be replaced if malfunctioning. The 12 Volt Battery is faulty A malfunctioning battery could cause the key fob not to function. The car's computer will not recognize the remote if this happens. Test the battery using a voltmeter before replacing it to determine its capacity. A fully charged battery should read 12.6 volts. If the reading drops dramatically it's time to change it. Put an electrical load for a short period of time on the battery to gauge its capacity. This will remove about 1% of the charge on the surface. Then, you can measure the voltage. The higher the capacity of the battery and the longer it can maintain its voltage. The ideal is to keep it close to 12 volts for several minutes. Radio Signal Faulty Radio Signal This is the most typical reason for keys not sending signals to a car. This problem can be solved by replacing the battery. However, it is important to purchase a battery that is the same size and voltage as the original. Fobs are subject to a lot of punishment, and aren't impervious to destruction. The battery buttons and contacts are delicate, so they can get bent or damaged from the force of. Other transmitters or objects that use the same frequency can also interfere with the signal. A light-control system in your home, for instance can interfere with key fobs that have the same frequency. This could interfere with the remote control of your car. Faulty OBDII Scan Tool There are many reasons scanners don't perform. Some are more complex than others. Professional scan tools enable mechanics to monitor the car's network and conduct a variety self-tests. These tools can save time, but are costly and are out of reach for the majority of DIYers. If your OBD2 scanner won't turn 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 has failed. This is one of the most common causes of a scan tool failing. The simple fix is usually to replace the fuse which has blown.