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Fiat Panda Key Fob Replacement Fiat Panda key fobs contain an transponder chip that transmits the signal to your vehicle to open the doors and start the engine. The fob might stop working due to a variety reasons. The most common cause of key fob failure is an inoperable coin battery. Other causes include water damage, a faulty receiver module and signal interference. Dead Coin Battery If the battery in your key fob has died, the first thing to do is replace it. Use a new button cell battery with identical in size, voltage and specifications as the original. 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. The trick is to use a paper towel that has been soaked in isopropyl or electronic cleaner. If the key fob has not been exposed to water, but isn't working, there may be a problem with the receiver module or an internal electronic chip. In these situations, reprogramming the key fob using an OBDII scanner might aid. Water Damage If your key fob has gotten an immersion in the puddle or pool or gone down the wash machine, it could have some water damage. You can usually get it working again by getting rid of the battery and scrubbing the circuit board with isopropyl alcohol. It is recommended to allow the device to completely dry before putting in a battery. You may have a faulty module if your key fob stops working after replacing the battery or updating. You can find reprogramming procedures for most remote key fobs on YouTube or in your owner's guide. You can also reset your computer of your car using the OBDII scanner tool. Faulty Receiver Module The key fob's chip is a chip that communicates with the vehicle's system. The chip will stop sending and receiving signals to the car when it is damaged. This can be caused by dropping the key fob, or due to exposure to water. If your key fob stopped working due to exposure to water and you are unable to fix it if you clean the chip using electronic cleaner or isopropyl ethanol. If the key fob won't respond to cleaning, it is likely that the module is in issues and needs to be replaced. A malfunctioning receiver module could also cause the remote control key to stop functioning. This is usually due to electromagnetic interference. A defective electronic chip The electronic chip inside your key fob plays an important function in the anti-theft security system in your car. It sends out a signal the immobiliser device in the vehicle to determine whether or not the key is in fact valid. If the chip 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 on the same frequency as your vehicle. In this situation you'll need an entirely new key fob. Contacts to the battery are not working properly. The battery contacts of a key fob are very fragile and are susceptible to damage with hard usage. If they're bent or damaged, the fob will not send any signals to the receiver modules inside the vehicle. Modern fobs are designed with rubber seals that keep out water. Submerging them in water, even if it is just an occasional drizzle or splash could harm the electronic chip. The key fob has a chip which communicates with the immobilizer system of the vehicle to begin it. The system relies on cryptocoding systems in the latest vehicles and the older red key system in older models. The chip must be replaced if it's faulty. Faulty 12 Volt Battery A defective battery can cause the key fob to function. When this happens, the car's computer system cannot recognize that the remote is in the vehicle. Before replacing the battery, test it by using a an voltmeter to gauge its capacity. A fully charged battery should display 12.6 volts. If the reading falls significantly it is time to replace the battery. Set TheKeyLab for a few seconds on the battery to test its capacity. This will take away 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. Ideal is to hold at or near 12 volts for several minutes. The radio signal is not working properly. Radio Signal This is the main reason for the key fob to stop sending signals to vehicles. This issue can be fixed by replacing the battery. It is crucial to purchase batteries that have the same dimensions and voltage as the original. Fobs are subject to a lot of abuse, but they're not indestructible. Contacts on batteries and buttons can be damaged by rough handling. The signal could also be disrupted by other objects or transmitters that use the same frequency. For instance, a light control panel near your home may transmit interference on the same frequency that key fobs utilize. This could affect the remote control of your car. Problems with OBDII Scan Tool There are a number of reasons why a scan tool could not work. Certain are more complicated than others. Professional scan tools enable mechanics to monitor the car's network, and run various self-tests. These tools can help save time, but they're expensive and not accessible to most DIYers. If your OBD2 scanner doesn't work Check the voltage on terminal 16 (scan tool power) and terminal 4 (chassis ground). If they are all OK there is a chance that a fuse has been blown. This is one of the most common causes of failures in the scan tool. The easiest fix is to replace the fuse that is blowing up.