Fiat Panda Key Fob Replacement
Fiat Panda key fobs contain transponder chips that send the signal to your vehicle to unlock the doors or start the engine. However, the key fob may stop working for several reasons.
try these out cited reason for key fob failure is the battery of the coin is dead. Other causes include water damage, a faulty module, and interference signals.
Dead Coin Battery
If your key fob's battery has failed, the initial step is to replace it. Choose a new button battery that has the same size, voltage and specification 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 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 remains inoperable, there may be an issue with the receiver module or an internal electronic chip. Reprogramming the keyfob by using an OBDII scan can help in these cases.

Water Damage
You might have water damage to your key fob if it was submerged in a pool, puddle or washing machine. It's possible to get it working by removing the batteries and cleaning the circuit board with ruby alcohol. It's a good idea allow the fob to dry completely before putting in a new battery.
You could have a damaged module when your key fob ceases working after replacing the battery or reprogramming. You can find information on the reprogramming of most remote keys on YouTube, or consult your owner's manual. You can also try resetting the car's onboard computer with the OBDII scan tool.
Faulty Receiver Module
The key fob's chip is an electronic 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 could cause this, as well as water exposure. If the key fob you have purchased has stopped functioning due to exposure to water it is possible to fix it if you clean the chip with electronic cleaner or isopropylethanol.
If the key fob continues to not respond after cleaning it there is a good chance that the component is damaged and needs to be replaced. A malfunctioning receiver could cause the key to not work. This is usually due to electromagnetic interference.
Faulty Electronic Chip
The electronic chip inside your key fob plays a vital part in the anti-theft security system of your vehicle. It sends a signal the immobiliser unit inside your car to determine whether the key is legitimate. Your car won't start in the event that the chip has been damaged.
A damaged chip could be caused by interference from other objects, weather conditions or transmitters located near your vehicle. In this instance you'll need a new key fob.
Contacts for the battery that are defective
The battery contacts on the key fob could be damaged due to heavy use. If they're damaged or bent, the fob will not send any signals to the receiver modules in the car.
Modern fobs come with rubber seals that keep out water. In the event of submerging them in water, even if just an occasional drizzle or splash could damage the chip's electronic components.
The key fob houses an electronic chip that communicates with the vehicle's immobilizer to allow it to activate it. The system utilizes the red keys of older vehicles as well as the cryptocoding system that is used in newer vehicles. If the chip is not working properly it must be replaced.
A faulty 12 Volt battery
A damaged battery can cause the remote to cease to function. The car's computer may not recognize the remote if this occurs.
Test the battery with the help of a voltmeter to determine its capacity. A fully charged battery will display 12.6 volts. If the reading falls dramatically then it's time to replace the battery.
To test the battery's power to determine its capacity, put an electric load on it for a couple of minutes. This will take off approximately 1 percent of the surface charge. Then, measure the voltage once more. The better the battery's capacity and the longer it can keep its voltage. The ideal is to keep it close to 12 volts during several minutes.
Faulty Radio Signal
This is the main reason for keys not sending signals to the car. The battery can be replaced to fix this problem. It is essential to purchase a battery that has the same dimensions and voltage as the original.
Fobs aren't indestructible and can withstand a lot. The battery buttons and contacts are delicate and are susceptible to being bent or broken by rough use.
Other objects or transmitters using the same frequency could also disrupt the signal. A light-control system in your home, for example, may interfere with key fobs that have the same bandwidth. This could interfere with your car's remote control.
The tool is not working properly. OBDII scan tool
There are many reasons why scanner tools may not work. Some are more complicated than others.
Professional scan tools enable mechanics to observe the car's network, and run various self-tests. They can be huge time savers but they can also be very expensive, and out of the reach of most DIYers.
If your OBD2 scanner won't turn on, check the voltage on terminal 16 (scan tool power) and terminal 4 (chassis ground). If they're both in good shape, it's likely that a fuse has blown. This is among the most common causes of failures in the scan tool. It is often easy to fix the problem by replacing the blown fuse.