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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 could stop working for a variety of reasons. The most common reason for key fob failure is a dead coin battery. Other causes are water damage as well as a defective module and interference signals. Dead Coin Battery If the battery in your key fob has died, the first thing to do is replace it. Use a brand new button battery with identical in size, voltage, and specification as the original. If the key fob was exposed to water (such as saltwater or rain at the beach) it should be cleaned before being used again. The best way to do this is using the paper towel and soak it in isopropyl, or electronic cleaner. If the key fob has not been exposed to water but still does not work, there may be an issue with the receiver module or an internal electronic chip. In these situations it is possible that reprogramming the key fob with an OBDII scanner may assist. Water Damage It is possible to get water damage if your key fob was submerged in a pool, puddle or washing machine. It is usually possible to get it back in working order by removing the batteries and cleaning the circuit board with ruby alcohol. It is a good idea to allow the fob to dry completely before putting in a new battery. You may have a faulty module in the event that your remote stops working after replacing the battery or updating. You can find the instructions for reprograming the majority of remote keys on YouTube or consult your owner's manual. You can also try resetting the car's onboard computer using the OBDII scan tool. Faulty Receiver Module The key fob is equipped with the chip that communicates the vehicle's system. If the chip is damaged, it will be unable to longer transmit and receive signals to the vehicle. Dropping the key fob could cause this, as well as exposure to water. If your key fob stopped functioning due to exposure to water, you may be able to fix it if clean the chip using electronic cleaner or isopropylethanol. However, if the key fob continues to not respond even after cleaning it there is a good chance that the module is defective and needs to be replaced. A defective receiver module could also cause the remote control key to stop functioning. This usually happens due to electromagnetic interference. Faulty Electronic Chip The electronic chip inside the key fob is a crucial component of the anti-theft system in your vehicle. It transmits a message the immobiliser in your car to determine whether the key is legitimate. If the chip is damaged or broken, the car will not start. A faulty chip may also be caused by interference from objects, bad weather or transmitters near your vehicle. In this instance an upgrade to the fob will be required. Contacts of the battery may be damaged. The battery contacts of the key fob are delicate and may be damaged with hard usage. If they are damaged or bent, the key fob won't send any signals to the receiver modules in the car. Modern fobs are equipped with rubber seals that block out water. Immersing them in water, even if it is just an occasional drizzle or splash could damage the chip's electronic circuit. The key fob has an electronic chip that communicates with the vehicle's immobilizer system in order to activate it. This system uses crypto coding systems in newer vehicles and the older red key system in older models. If this chip is faulty and needs to be replaced. Faulty 12 Volt Batterie A faulty battery may cause the key fob not to function. The car's computer will not recognize the remote when this occurs. Before replacing the battery, test it by using a an voltmeter for determining its capacity. A fully charged battery will read 12.6 volts. If the reading falls significantly then it's time to replace the battery. Put an electrical load for a few moments on the battery to test its capacity. This will remove 1percent of the surface charges. After that, measure the voltage. The longer a battery is able to hold its voltage greater is its capacity. Ideally, G28 Car Keys will remain close to 12 volts several minutes. Problems with Radio Signal This is the most common reason for the key fob to stop sending signals to cars. The battery can be replaced to fix this problem. It is essential to purchase an identical battery voltage and dimensions as the original. Fobs can take a lot abuse, but they're also not impervious to destruction. Contacts and buttons on batteries can be damaged by rough handling. A signal may also be disrupted by other objects or transmitters who use the same frequency. A light control panel in your home, for instance can interfere with key fobs that have the same bandwidth. This could interfere with your car's remote control. Problems with OBDII Scan Tool There are a number of reasons why a scanner might not work. Certain are more complicated than others. Professional scan tools allow a mechanic to monitor the car's network and perform a variety of self-tests. These can be real time savers, however they can also be very expensive and are out of the reach of most DIYers. If your OBD2 scan tool won't power on, check the voltage at the terminals 16 (scantool power) and 4 (chassis earth). If these are OK the chances are that a fuse has failed. This is the most frequent reason for failure of the scan tool. The easiest fix is to replace the fuse that has been blown.