Fiat Panda Key Fob Replacement Fiat Panda key fobs contain a transponder chip which sends a signal to your car to unlock the doors or start the engine. The fob could stop working due to a variety reasons. A dead battery for the coin is the most common reason for malfunctioning keys. Other reasons include water damage, a faulty receiver module, and signal interference. Dead Coin Battery Replace the battery if the key fob has died. Choose a button battery that has the same voltage, size and specification as your old one. If the key fob was exposed to water (such as rain or saltwater at the beach), it must be cleaned prior to using it again. A paper towel soaked with isopropyl alcohol or electronic cleaner can help. If the key fob hasn't been exposed to water, but still does not work, there may be a problem with the receiver module or an internal electronic chip. In these cases it is possible that reprogramming the key fob using an OBDII scanner can aid. Water Damage If your key fob has gotten an immersion in the puddle or pool or walked through the washing machine, you might have some water damage. It's usually possible to restore it's functionality by getting rid of the battery and scrubbing the circuit board with isopropyl alcohol. It is a good idea to allow the fob to dry completely before putting in a brand new battery. If your key fob has stopped working even after replacing the battery and changing the program, you could have a defective receiver module. You can find instructions for the reprogramming of most remote keys on YouTube or refer to the owner's manual. You could also try resetting the car's onboard computer with the OBDII scan tool. Faulty Receiver Module The key fob has the chip that communicates the vehicle's system. This chip will stop sending and receiving signals to the car if damaged. Dropping the key fob could result in this, as can water exposure. If the key fob has stopped functioning after exposure to water, it may be possible to fix it by cleaning the chip using isopropyl alcohol or electronic cleaner. If the key fob does not respond after cleaning it, there is a good chance that the receiver module is not functioning properly and will require to be replaced. A faulty receiver module can also cause the remote control key to stop functioning. This is usually due to electromagnetic interference. Faulty Electronic Chip The chip inside your key fob is a vital function in the anti-theft security system of your car. It transmits a message the immobiliser in your car that tells it whether the key is legitimate. If the chip is damaged or broken, your vehicle will not start. A defective chip can be caused by interference signals from objects or weather conditions that are bad, or transmitters on the same frequency in close proximity to your car. In this scenario you'll need a new key fob. Contacts of the battery may be damaged. The battery contacts on a key fob are very delicate and could be damaged 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 equipped with rubber seals that block out water. In the event of submerging them in water, even if just an occasional drizzle or splash, can damage the chip's electronic components. The key fob houses a chip that communicates with the vehicle's immobilizer in order to allow it to start. This system uses crypto coding systems in vehicles that are more modern or the red key system in older ones. If the chip is defective it must be replaced. Poor 12 Volt Battery A damaged battery could cause the key fob to function. When this occurs the car's computer will not be able to recognize that the remote is within the vehicle. Before replacing the battery, test it using a a voltmeter to determine its capacity. A fully charged battery should display 12.6 volts. If the reading falls significantly the time is now to replace it. To test a battery's capacity, place an electrical load on it for a couple of minutes. This will eliminate 1percent of the charges. After that, take the voltage again. The better the battery's capacity and the longer it can maintain its voltage. Ideally, it should remain at 12 volts or less for several minutes. Faulty Radio Signal This is the most common reason for a keyfob that ceases to send signals to the car. This problem can be solved by replacing the battery. But, it is essential to choose a battery that is the same size and voltage as the original. Fobs endure a lot of abuse, but they're also not impervious to destruction. Battery contacts and buttons can be damaged by rough handling. A signal can also be disrupted by other transmitters or objects which use the same frequency. A light-control system in your home, for instance, may interfere with key fobs which use the same bandwidth. This could interfere with the remote control in your car. Afflicted OBDII scan tool There are many reasons a scanner tool may not 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, however they can be expensive, out of the budget of most DIYers. If your OBD2 scanner won't turn on make sure you check the voltage at terminal 16 (scan tool power) and terminal 4 (chassis ground). If they're both in good shape it's likely that a fuse has been blown. https://www.thekeylab.co.uk/fiat-car-keys/ is the main reason for failure of the scan tool. It is often easy to fix the issue by replacing the fuse that has blown.