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fiat punto key Panda keyfobs are equipped with a transponder, which sends a signal from the fob to the car to open doors or turn on the motor. The fob may stop working due to a variety reasons.

The most commonly cited reason for key fob failure is an inoperable coin battery. Other causes include water damage or a malfunctioning module and interference signals.

Dead Coin Battery

Replace the battery in case your key fob has died. Make use of a new button battery that has the same size, voltage, and specification as the previous one.

If the key fob has been exposed to water, such as a splash of rain or salt water at the beach, it needs to be cleaned before it is able to be used again. A paper towel soaked in isopropyl alcohol or electronic cleaner will work wonders.

If the key fob has not been exposed to water, but isn't working, there may be an issue with the receiver module or an internal electronic chip. Reprogramming the fiat 500 keyfob through an OBDII scan can help in these instances.

Water Damage

You could have water damage to your key fob if it was submerged in a pool, puddle or washing machine. You can usually get it working again by taking off the battery and then scrubbing the circuit board with isopropyl alcohol. It's best to let the circuit board completely dry before installing the battery.

If your key fob isn't working, even after replacing the battery and reprogramming it, you may have a problem with the receiver module. There are 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 contains an electronic chip that communicates with the vehicle's system. The chip will stop sending and receiving signals to the car if damaged. This could be due to dropping the key fob or by exposure to water. If your key fob has stopped working due to water exposure it is possible fix the issue if you clean the chip with electronic cleaner or isopropylethanol.

However, if the key fob still does not respond even after cleaning it then it is likely that the module is defective and will need to be replaced. A damaged receiver module may also cause the remote control key to stop working. This is usually due to electromagnetic interference.

Faulty Electronic Chip

The electronic chip in the key fob is an important component of the anti-theft systems in your vehicle. It sends a message to the immobiliser in your car to inform it whether the key is genuine. If the chip is damaged or damaged, your car won't start.

A faulty chip can also be caused by interference signals from objects, bad weather conditions or transmitters operating on the same frequency as your vehicle. In this situation you'll need an entirely new key fob.

Contacts of the battery may be damaged.

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

Modern fobs are constructed with rubber seals to keep out water. Submerging them in water, even if it is just the slightest splash or drizzle could damage the electronic chip.

The key fiat fob houses the chip that connects to the vehicle's immobilizer to allow it to start it. This system uses crypto coding systems in modern vehicles, or the old red key system in older models. This chip will have to be replaced if faulty.

The 12 Volt Battery is faulty

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

Test the battery with an voltmeter prior to replacing it 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 test a battery's capacity put an electrical load on it for a couple of minutes. This will eliminate 1percent of the surface charges. Then take another measurement of the voltage. The better the battery's capacity and the longer it can maintain its voltage. Ideally, it should remain at 12 volts or less for several minutes.

Problems with Radio Signal

This is the most typical reason for the key fob not sending signals to vehicles. The battery can be replaced to fix this problem. However, it is crucial to select a replacement battery with the same size and voltage as the original one.

Fobs are not indestructible and can withstand a lot. Contacts on batteries and buttons can be damaged through rough handling.

A signal may also be interrupted by other objects or transmitters that use the same frequency. For example, a light-control panel near your home may send interference over the same frequency as key fobs utilize. This could interfere with your car's remote control.

Incorrect OBDII Scan Tool

There are a number of reasons why a scan tool could not work. Some 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 tools can save you a lot of time, but they are costly and are out of reach for the majority of DIYers.

If your OBD2 scan tool doesn't turn on, test the voltage at the terminals 16 (scantool power) and 4 (chassis earth). If both are in good condition it's possible that a fuse is blowing. This is one of the most frequent causes of scan tool failure. The easiest solution is to replace the blown fuse.