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Fiat Panda keyfobs are equipped with a transponder which transmits an electronic signal from the fob to the car to open doors or start the motor. However, the fob could not function due to a variety of reasons.

A dead coin battery is the most common reason for a key fob malfunction. Other causes include water damages or a damaged module and interference signals.

Dead Coin Battery

Replace the battery if the key fob has failed. Use a button cell battery with the same voltage, size, and specifications as the 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. The trick is to use a paper towel that has been soaked in isopropyl or an electronic cleaner.

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 to re-programme the key fob with an OBDII scanner can help.

Water Damage

If your key fob took an immersion in the pool or puddle, or taken a trip down the wash machine, you might have some water damage. It's usually possible to be able to get it back up and running by taking off the battery and then scrubbing the circuit board with isopropyl alcohol. It's best to allow the device to completely dry prior to installing batteries.

If your key fob has stopped working even after replacing the battery and programming it again, you might have a malfunctioning receiver module. You can find information on the reprogramming of most remote keys on YouTube, or consult your 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 when it is damaged. This could be due to dropping the key fob or due to exposure to water. If the key fob stops working after exposure to water it could be possible to fix it by cleaning the chip with isopropyl alcohol or an electronic cleaner.

If the key fob won't respond to cleaning, it is possible that the component has issues and needs to be replaced. A malfunctioning receiver module could 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 plays a crucial role in the anti-theft security system in your car. It sends a signal the immobiliser unit inside the vehicle to determine whether or not the key is valid. If the chip is damaged or broken, your vehicle will not start.

A damaged chip could be caused by interference signals from objects, bad weather conditions or transmitters on the same frequency as your car. In this instance you'll require an entirely new key fob.

Contacts of the battery may be damaged.

The battery contacts of the fob's battery can be damaged due to heavy use. If they are damaged or bent, the key fob will not send any signals to the receiver modules inside the car.

Modern fobs come with rubber seals in order to keep out water. Submerging them in water, even if it's only the slightest splash or drizzle could harm the chip's electronic circuit.

The key fob contains the chip that connects to the vehicle's immobilizer system to allow it to start. This system uses crypto coding systems in vehicles that are more modern as well as the traditional red key system used in older ones. If the chip is defective and needs to be replaced.

The 12 Volt Battery is faulty

A faulty battery can cause the key fob to stop working. The car's computer will not recognize the remote if this happens.

Before you replace the battery, test it with an voltmeter to gauge its capacity. A fully charged battery should read 12.6 volts. If the reading drops significantly, it is time to replace the battery.

Put an electrical load for a short period of time on the battery to test its capacity. This will take off about 1% of the surface charge. Then, measure the voltage again. The higher the capacity of the battery is, the longer it will keep its voltage. The ideal scenario is to keep it close to 12 volts several minutes.

Radio Signal Faulty Radio Signal

This is the main reason for a key fob that ceases to send signals to the car. The battery is able to be replaced to resolve this problem. It is crucial to purchase a battery with the same voltage and dimensions as the original.

Fobs take a lot of abuse, but they're not indestructible. Contacts and buttons on batteries can be damaged by rough handling.

A signal can also be affected by other objects or transmitters who use the same frequency. For instance, a lighting control panel in your home could transmit interference on the same frequency as key fobs utilize. This could affect the remote control of your car.

The tool is not working properly. OBDII scan tool

There are a number of reasons why a scanner could not work. Certain are more complicated than others.

Professional scan tools enable a mechanic observe the car's network and perform various self-tests. These tools can save time, but are expensive and not accessible to the majority of DIYers.

If your OBD2 scanner doesn't work make sure you check the voltage at terminal 16 (scan tool power) and terminal 4 (chassis ground). If both are in good condition, it's likely that a fuse is blowing. This is the most typical reason for failure of the scan tool. It is generally easy to fix the problem by replacing the fuse that was blown.