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Fiat Panda Key Fob Replacement Fiat Panda key fobs contain transponder chips that send an alert to your car to open the doors and start the engine. The fob could stop working for a variety of reasons. A dead coin battery is the most common reason for malfunctioning keys. Other causes are water damage as well as a defective module and interference signals. Dead Coin Battery Replace the battery if your key fob is dead. Use a new button cell battery that is identical in size, voltage and specifications as the previous one. If the key fob was exposed to water, such as a splash of rain or salt water at the beach, it's going to need to be cleaned before it can be used again. The best solution is to use a paper towel soaked with isopropyl, or electronic cleaner. If the key fob hasn't been exposed to water but remains inoperable it could be due to a problem with the receiver module or an internal electronic chip. In these situations it is possible to re-programme the key fob with an OBDII scanner might assist. Water Damage If your key fob took submerged in a puddle or pool or gone through the washing machine, you could be suffering some water damage. It is usually possible to get it working again by getting rid of the battery and scrubbing the circuit board with isopropyl alcohol. It's a good idea to let the fob dry completely before putting in a new battery. There could be a problem with the module if your key fob stops working after replacing the battery or changing the programming. There are instructions for changing the programming of most 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 contains a chip that connects to the vehicle's system. If this chip becomes damaged, it will be unable to longer transmit and receive signals to the vehicle. The key fob being dropped can cause this, as well as exposure to water. If your key fob stopped working due to water exposure or water exposure, you might be able to fix it if you clean the chip with electronic cleaner or isopropyl ethanol. If the key fob does not respond after cleaning it, it is likely that the component is damaged and needs to be replaced. A defective receiver can cause the key to stop working. This usually happens due to electromagnetic interference. A malfunctioning electronic chip The electronic chip that is in your key fob plays a vital role in the anti-theft system of your car. It sends a signal to the immobiliser in your car to inform it 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 other objects, weather conditions or transmitters in the vicinity of your vehicle. In this scenario, a new fob will be required. Contacts for the battery that are damaged The battery contacts on the key fob are delicate and could be damaged through repeated use. If they're bent or broken the fob will not be able to send any signals to the receiver modules inside the car. Modern fobs are made with rubber seals to keep out water. Immersing them in water, even if it is just a light drizzle or splash could harm the chip's electronic components. The key fob is equipped with the chip that connects to the vehicle's immobilizer in order to allow it to start. This system makes use of cryptocoding systems in modern vehicles or the red key system used in older models. The chip must be replaced if defective. A faulty 12 Volt battery A defective battery can cause the key fob to stop working. When this occurs, the car's computer system won't recognize that the remote is inside the vehicle. Before you replace the battery, test it by using a an voltmeter for determining its capacity. A fully charged battery will display 12.6 volts. If the reading falls significantly then it's time to replace the battery. To test the battery's capacity to determine its capacity, put an electric load on it for a few minutes. This will remove approximately 1% of the surface charge. Then take another measurement of the voltage. The longer a battery is able to hold its voltage greater is its capacity. Ideally, it will remain at 12 volts or less for several minutes. Radio Signal Faulty Radio Signal This is the most common reason for the key fob to stop sending signals to cars. This issue can be fixed by replacing the battery. It is however important to select a replacement battery that has the same size and voltage as the original. Fobs take a lot of abuse, but they're not impervious to destruction. Battery contacts and buttons can be damaged by rough handling. Other transmitters or objects using the same frequency can interfere with a signal. A light-control system in your home, for example can interfere with key fobs that have the same frequency. This could cause interference with the remote control in your car. Afflicted fiat punto key replacement The Keylab There are many reasons scanners don't perform. Some are more complex than others. Professional scan tools enable mechanics to observe the car's networks and perform a variety of self-tests. These are great time savers, however they are also extremely expensive, and out of the budget of most DIYers. If your OBD2 scan tool won't power on, make sure you check the voltage at terminals 16 (scantool power) and 4 (chassis earth). If these are OK it's likely that a fuse has been blown. This is one of the most common causes of failures in the scan tool. The easiest solution is to replace the blown fuse.