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Fiat Panda Key Fob Replacement Fiat Panda key fobs contain a transponder chip that sends signals to your car to open the doors and start the engine. However, the fob may not function due to a variety of reasons. The most common reason for key fob failure is the battery of the coin is dead. Other causes include water damages as well as a defective module and interference signals. Dead Coin Battery If the battery in your key fob has failed, the initial thing to do is replace it. Choose a button battery with 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 being used again. A paper towel soaked in isopropyl alcohol or electronic cleaner will be the solution. If the key fob has not been exposed to water, but isn't working it could be due to an issue with the receiver module or an internal electronic chip. In these cases you can reprogramme the key fob using an OBDII scanner could assist. 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 working by taking the batteries off and cleaning the circuit board with rubbing alcohol. It is a good idea to allow the fob to dry completely prior to installing a new battery. You could have a damaged module when your key fob ceases working after replacing the battery or changing the programming. You can find the instructions for the reprogramming of most remote keys on YouTube or consult your owner's manual. You could also try resetting the car's computer onboard using the OBDII scan tool. Faulty Receiver Module The key fob's chip is the chip that communicates with the vehicle's system. The chip will stop sending and receiving signals to the car if it becomes damaged. Dropping the key fob can cause this, as well as exposure to water. If the key fob stops working after exposure to water it could be possible to repair the issue by cleaning or cleaning the chip using isopropyl alcohol or an electronic cleaner. If the key fob does not respond after cleaning it, then it is likely that the module is defective and needs to be replaced. A faulty receiver can also cause the key to stop working. This is usually caused by electromagnetic interference. A malfunctioning electronic chip The electronic chip inside your key fob is a vital role in the anti-theft security system of your vehicle. It sends out a signal the immobiliser unit of your car to determine whether the key is in fact valid. If the chip is damaged or broken, your vehicle won't start. A faulty chip can also be caused by interference signals from objects such as weather conditions, objects or transmitters on the same frequency near your vehicle. In this instance you'll need a new key fob. Contacts with the battery may be damaged. The battery contacts of the fob's battery can be damaged due to heavy use. If they are bent, or broken, the fob won't send any signals to the receiver modules inside the vehicle. Modern fobs have rubber seals that keep out water. A splash of water or light rain should be fine however, submerging them in saltwater may cause damage to the chip's electronic components. The key fob is equipped with a chip which communicates with the immobilizer system of the vehicle, allowing it to start it. This system uses crypto coding systems in the latest vehicles and the older red key system for older models. If the chip is not working properly, it will need to be replaced. Problems with 12 Volt Batteries A damaged battery could cause the key fob to function. If this happens the car's computer won't recognize that the remote is within the vehicle. Before replacing the battery, test it by using a a voltmeter to determine its capacity. A fully charged battery should read 12.6 volts. If the reading drops significantly it is time to replace the battery. To determine the capacity of a battery put an electrical load on it for a few minutes. This will take off approximately 1 percent of the surface charge. Then take another measurement of the voltage. The greater the battery's capacity, the longer it can maintain its voltage. It is ideal to maintain close to 12 volts over several minutes. The radio signal is not working properly. Radio Signal This is the most typical cause of a key fob that ceases to send signals to the car. The issue can be fixed by replacing the battery. It is important to buy batteries that have the same voltage and dimensions as the original. Fobs are not indestructible and are susceptible to damage. The battery contacts and buttons could be damaged by rough handling. Other transmitters or objects using the same frequency could also interfere with a signal. For instance, a light control panel in your home could transmit interference using the same bandwidth that key fobs use. G28 Car Keys could interfere with the remote control in your car. The tool is not working properly. OBDII scan tool There are a number of reasons why a scan tool could not function. Certain are more complicated than others. Professional scan tools let mechanics to look over the car's network, and run various self-tests. These tools can save you a lot of time, but they're expensive and not accessible to the majority of DIYers. If your OBD2 scan tool fails to turn on, test the voltage at terminals 16 (scantool power) and 4 (chassis earth). If these are both present it's likely that a fuse is blowing. This is one of the most common causes of a scan tool failing. It is usually easy to fix the issue by replacing the blown fuse.